From fb3f0e18a2ada57f98c3b10fab0c13fb2d504ae1 Mon Sep 17 00:00:00 2001
From: Rye <rye@alchemyviewer.org>
Date: Mon, 1 Dec 2025 05:46:57 -0500
Subject: #5078 Replace boost::function with std::function

* Replace boost::function usage with std::function for easier debugging and reduced compiler warnings
* Remove a few remaining instances of boost::noncopyable that were missed in tests

Signed-off-by: Rye <rye@alchemyviewer.org>
---
 indra/llui/llbutton.cpp            |  2 +-
 indra/llui/llbutton.h              |  2 +-
 indra/llui/llcallbackmap.h         |  8 ++++----
 indra/llui/llclipboard.h           |  2 --
 indra/llui/llcombobox.cpp          |  6 +++---
 indra/llui/llcombobox.h            |  1 -
 indra/llui/lldockablefloater.cpp   |  2 +-
 indra/llui/lldockablefloater.h     |  2 +-
 indra/llui/lldockcontrol.h         |  4 ++--
 indra/llui/llflashtimer.cpp        |  2 +-
 indra/llui/llflashtimer.h          |  6 +++---
 indra/llui/llfloaterreg.h          |  4 ++--
 indra/llui/llfocusmgr.cpp          | 10 +++++-----
 indra/llui/llfunctorregistry.h     |  2 --
 indra/llui/lllazyvalue.h           |  7 ++++---
 indra/llui/lllineeditor.h          |  4 ++--
 indra/llui/llmenugl.h              |  1 -
 indra/llui/llnotifications.h       | 13 ++++++-------
 indra/llui/llnotificationsutil.cpp |  2 +-
 indra/llui/llnotificationsutil.h   |  4 ++--
 indra/llui/llpanel.cpp             |  8 ++++----
 indra/llui/llpanel.h               |  6 +++---
 indra/llui/llresizebar.h           |  4 ++--
 indra/llui/llscrollbar.h           |  2 +-
 indra/llui/llscrolllistctrl.cpp    | 14 +++++++-------
 indra/llui/llscrolllistctrl.h      |  4 ++--
 indra/llui/llsearcheditor.cpp      |  8 ++++----
 indra/llui/lltextbox.cpp           |  6 +++---
 indra/llui/lltextbox.h             |  4 ++--
 indra/llui/lltexteditor.cpp        |  2 +-
 indra/llui/lltexteditor.h          |  2 +-
 indra/llui/lltextutil.cpp          |  2 +-
 indra/llui/lltextutil.h            |  2 +-
 indra/llui/lltextvalidate.h        |  1 -
 indra/llui/lltoolbar.cpp           | 36 ++++++++++++++++++------------------
 indra/llui/lltoolbar.h             |  8 ++++----
 indra/llui/lltooltip.h             |  4 ++--
 indra/llui/llui.h                  |  6 +++---
 indra/llui/lluictrl.cpp            |  9 +++++----
 indra/llui/lluictrl.h              | 10 +++++-----
 indra/llui/lluictrlfactory.h       |  2 +-
 indra/llui/llurlaction.h           |  6 +++---
 indra/llui/llview.h                |  4 ++--
 indra/llui/llxuiparser.h           |  4 ++--
 44 files changed, 116 insertions(+), 122 deletions(-)

(limited to 'indra/llui')

diff --git a/indra/llui/llbutton.cpp b/indra/llui/llbutton.cpp
index d2534b3939..0048c44189 100644
--- a/indra/llui/llbutton.cpp
+++ b/indra/llui/llbutton.cpp
@@ -190,7 +190,7 @@ LLButton::LLButton(const LLButton::Params& p)
         // Note: flashing should be allowed in settings.xml (boolean key "EnableButtonFlashing").
         S32 flash_count = p.button_flash_count.isProvided()? p.button_flash_count : 0;
         F32 flash_rate = p.button_flash_rate.isProvided()? p.button_flash_rate : 0.0f;
-        mFlashingTimer = new LLFlashTimer ((LLFlashTimer::callback_t)NULL, flash_count, flash_rate);
+        mFlashingTimer  = new LLFlashTimer((LLFlashTimer::callback_t) nullptr, flash_count, flash_rate);
     }
     else
     {
diff --git a/indra/llui/llbutton.h b/indra/llui/llbutton.h
index 890e7c2d1e..f530eceb4b 100644
--- a/indra/llui/llbutton.h
+++ b/indra/llui/llbutton.h
@@ -153,7 +153,7 @@ public:
 
     ~LLButton();
     // For backward compatability only
-    typedef boost::function<void(void*)> button_callback_t;
+    typedef std::function<void(void*)> button_callback_t;
 
     void            addImageAttributeToXML(LLXMLNodePtr node, const std::string& imageName,
                                         const LLUUID&   imageID,const std::string&  xmlTagName) const;
diff --git a/indra/llui/llcallbackmap.h b/indra/llui/llcallbackmap.h
index 07775dc30f..3115606d91 100644
--- a/indra/llui/llcallbackmap.h
+++ b/indra/llui/llcallbackmap.h
@@ -29,13 +29,13 @@
 
 #include <map>
 #include <string>
-#include <boost/function.hpp>
+#include <functional>
 
 class LLCallbackMap
 {
 public:
     // callback definition.
-    typedef boost::function<void* (void* data)> callback_t;
+    typedef std::function<void* (void* data)> callback_t;
 
     typedef std::map<std::string, LLCallbackMap> map_t;
     typedef map_t::iterator map_iter_t;
@@ -48,8 +48,8 @@ public:
         return (void*)panel;
     }
 
-    LLCallbackMap() : mCallback(NULL), mData(NULL) { }
-    LLCallbackMap(callback_t callback, void* data = NULL) : mCallback(callback), mData(data) { }
+    LLCallbackMap() : mCallback(nullptr), mData(nullptr) {}
+    LLCallbackMap(callback_t callback, void* data = nullptr) : mCallback(callback), mData(data) {}
 
     callback_t  mCallback;
     void*       mData;
diff --git a/indra/llui/llclipboard.h b/indra/llui/llclipboard.h
index 12d8233e0a..9f9cc3e54d 100644
--- a/indra/llui/llclipboard.h
+++ b/indra/llui/llclipboard.h
@@ -27,8 +27,6 @@
 #ifndef LL_LLCLIPBOARD_H
 #define LL_LLCLIPBOARD_H
 
-#include <boost/function.hpp>
-
 #include "llstring.h"
 #include "lluuid.h"
 #include "llsingleton.h"
diff --git a/indra/llui/llcombobox.cpp b/indra/llui/llcombobox.cpp
index f3876ef695..ae676251ff 100644
--- a/indra/llui/llcombobox.cpp
+++ b/indra/llui/llcombobox.cpp
@@ -1009,7 +1009,7 @@ void LLComboBox::setKeystrokeOnEsc(bool enable)
 
 void LLComboBox::onTextEntry(LLLineEditor* line_editor)
 {
-    if (mTextEntryCallback != NULL)
+    if (mTextEntryCallback != nullptr)
     {
         (mTextEntryCallback)(line_editor, LLSD());
     }
@@ -1029,7 +1029,7 @@ void LLComboBox::onTextEntry(LLLineEditor* line_editor)
             mList->deselectAllItems();
             mLastSelectedIndex = -1;
         }
-        if (mTextChangedCallback != NULL)
+        if (mTextChangedCallback != nullptr)
         {
             (mTextChangedCallback)(line_editor, LLSD());
         }
@@ -1077,7 +1077,7 @@ void LLComboBox::onTextEntry(LLLineEditor* line_editor)
         // RN: presumably text entry
         updateSelection();
     }
-    if (mTextChangedCallback != NULL)
+    if (mTextChangedCallback != nullptr)
     {
         (mTextChangedCallback)(line_editor, LLSD());
     }
diff --git a/indra/llui/llcombobox.h b/indra/llui/llcombobox.h
index 8be3eb57e4..d6ea1202d3 100644
--- a/indra/llui/llcombobox.h
+++ b/indra/llui/llcombobox.h
@@ -36,7 +36,6 @@
 #include "llrect.h"
 #include "llscrolllistctrl.h"
 #include "lllineeditor.h"
-#include <boost/function.hpp>
 
 // Classes
 
diff --git a/indra/llui/lldockablefloater.cpp b/indra/llui/lldockablefloater.cpp
index 19ae03cdf9..c20e5a806c 100644
--- a/indra/llui/lldockablefloater.cpp
+++ b/indra/llui/lldockablefloater.cpp
@@ -77,7 +77,7 @@ LLDockableFloater::~LLDockableFloater()
 bool LLDockableFloater::postBuild()
 {
     // Remember we should force docking when the floater is opened for the first time
-    if (mIsDockedStateForcedCallback != NULL && mIsDockedStateForcedCallback())
+    if (mIsDockedStateForcedCallback != nullptr && mIsDockedStateForcedCallback())
     {
         mForceDocking = true;
     }
diff --git a/indra/llui/lldockablefloater.h b/indra/llui/lldockablefloater.h
index 9c516e23a4..accd9fddfc 100644
--- a/indra/llui/lldockablefloater.h
+++ b/indra/llui/lldockablefloater.h
@@ -129,7 +129,7 @@ protected:
 
     // Checks if docking should be forced.
     // It may be useful e.g. if floater created in mouselook mode (see EXT-5609)
-    boost::function<bool ()> mIsDockedStateForcedCallback;
+    std::function<bool()> mIsDockedStateForcedCallback;
 
 private:
     std::unique_ptr<LLDockControl> mDockControl;
diff --git a/indra/llui/lldockcontrol.h b/indra/llui/lldockcontrol.h
index b6ac9c19dd..1f6c3b9f57 100644
--- a/indra/llui/lldockcontrol.h
+++ b/indra/llui/lldockcontrol.h
@@ -49,11 +49,11 @@ public:
 
 public:
     // callback for a function getting a rect valid for control's position
-    typedef boost::function<void (LLRect& )> get_allowed_rect_callback_t;
+    typedef std::function<void (LLRect& )> get_allowed_rect_callback_t;
 
     LOG_CLASS(LLDockControl);
     LLDockControl(LLView* dockWidget, LLFloater* dockableFloater,
-            const LLUIImagePtr& dockTongue, DocAt dockAt, get_allowed_rect_callback_t get_rect_callback = NULL);
+            const LLUIImagePtr& dockTongue, DocAt dockAt, get_allowed_rect_callback_t get_rect_callback = nullptr);
     virtual ~LLDockControl();
 
 public:
diff --git a/indra/llui/llflashtimer.cpp b/indra/llui/llflashtimer.cpp
index 54f54653e2..addc3375b3 100644
--- a/indra/llui/llflashtimer.cpp
+++ b/indra/llui/llflashtimer.cpp
@@ -50,7 +50,7 @@ LLFlashTimer::LLFlashTimer(callback_t cb, S32 count, F32 period)
 void LLFlashTimer::unset()
 {
     mUnset = true;
-    mCallback = NULL;
+    mCallback = nullptr;
 }
 
 bool LLFlashTimer::tick()
diff --git a/indra/llui/llflashtimer.h b/indra/llui/llflashtimer.h
index 4ef70faf2d..1cd1df392b 100644
--- a/indra/llui/llflashtimer.h
+++ b/indra/llui/llflashtimer.h
@@ -28,13 +28,13 @@
 #define LL_FLASHTIMER_H
 
 #include "lleventtimer.h"
-#include "boost/function.hpp"
+#include <functional>
 
 class LLFlashTimer : public LLEventTimer
 {
 public:
 
-    typedef boost::function<void (bool)> callback_t;
+    typedef std::function<void (bool)> callback_t;
 
     /**
      * Constructor.
@@ -43,7 +43,7 @@ public:
      * @param period - how frequently callback should be called
      * @param cb - callback to be called each tick
      */
-    LLFlashTimer(callback_t cb = NULL, S32 count = 0, F32 period = 0.0);
+    LLFlashTimer(callback_t cb = nullptr, S32 count = 0, F32 period = 0.0);
     ~LLFlashTimer() {};
 
     /*virtual*/ bool tick();
diff --git a/indra/llui/llfloaterreg.h b/indra/llui/llfloaterreg.h
index 94a67c8d8b..24d1476dda 100644
--- a/indra/llui/llfloaterreg.h
+++ b/indra/llui/llfloaterreg.h
@@ -30,8 +30,8 @@
 #include "llrect.h"
 #include "llsd.h"
 
+#include <functional>
 #include <list>
-#include <boost/function.hpp>
 
 //*******************************************************
 //
@@ -41,7 +41,7 @@
 class LLFloater;
 class LLUICtrl;
 
-typedef boost::function<LLFloater* (const LLSD& key)> LLFloaterBuildFunc;
+typedef std::function<LLFloater* (const LLSD& key)> LLFloaterBuildFunc;
 
 class LLFloaterReg
 {
diff --git a/indra/llui/llfocusmgr.cpp b/indra/llui/llfocusmgr.cpp
index 0d7c98294f..7544a44478 100644
--- a/indra/llui/llfocusmgr.cpp
+++ b/indra/llui/llfocusmgr.cpp
@@ -32,11 +32,11 @@
 
 const F32 FOCUS_FADE_TIME = 0.3f;
 
-LLFocusableElement::LLFocusableElement()
-:   mFocusLostCallback(NULL),
-    mFocusReceivedCallback(NULL),
-    mFocusChangedCallback(NULL),
-    mTopLostCallback(NULL)
+LLFocusableElement::LLFocusableElement() :
+    mFocusLostCallback(nullptr),
+    mFocusReceivedCallback(nullptr),
+    mFocusChangedCallback(nullptr),
+    mTopLostCallback(nullptr)
 {
 }
 
diff --git a/indra/llui/llfunctorregistry.h b/indra/llui/llfunctorregistry.h
index da5570d922..953963b683 100644
--- a/indra/llui/llfunctorregistry.h
+++ b/indra/llui/llfunctorregistry.h
@@ -31,8 +31,6 @@
 #include <string>
 #include <map>
 
-#include <boost/function.hpp>
-
 #include "llsd.h"
 #include "llsingleton.h"
 
diff --git a/indra/llui/lllazyvalue.h b/indra/llui/lllazyvalue.h
index 622e69ce95..fc15ead032 100644
--- a/indra/llui/lllazyvalue.h
+++ b/indra/llui/lllazyvalue.h
@@ -28,15 +28,16 @@
 #ifndef LL_LAZY_VALUE_H
 #define LL_LAZY_VALUE_H
 
-#include <boost/function.hpp>
+#include <functional>
+#include <type_traits>
 
 // Holds on to a value of type T *or* calls a functor to generate a value of type T
 template<typename T>
 class LLLazyValue
 {
 public:
-    typedef typename boost::add_reference<typename boost::add_const<T>::type>::type T_const_ref;
-    typedef typename boost::function<T_const_ref (void)>                            function_type;
+    typedef typename std::add_lvalue_reference<typename std::add_const<T>::type>::type T_const_ref;
+    typedef typename std::function<T_const_ref (void)>                            function_type;
 
 public:
     LLLazyValue(const function_type& value)
diff --git a/indra/llui/lllineeditor.h b/indra/llui/lllineeditor.h
index 7533f76f1d..3f762822ee 100644
--- a/indra/llui/lllineeditor.h
+++ b/indra/llui/lllineeditor.h
@@ -60,7 +60,7 @@ class LLLineEditor
 {
 public:
 
-    typedef boost::function<void (LLLineEditor* caller)> keystroke_callback_t;
+    typedef std::function<void (LLLineEditor* caller)> keystroke_callback_t;
 
     struct MaxLength : public LLInitParam::ChoiceBlock<MaxLength>
     {
@@ -259,7 +259,7 @@ public:
     void            setSelectAllonCommit(bool b) { mSelectAllonCommit = b; }
 
     void            onKeystroke();
-    typedef boost::function<void (LLLineEditor* caller, void* user_data)> callback_t;
+    typedef std::function<void (LLLineEditor* caller, void* user_data)> callback_t;
     void            setKeystrokeCallback(callback_t callback, void* user_data);
 
     void            setMaxTextLength(S32 max_text_length);
diff --git a/indra/llui/llmenugl.h b/indra/llui/llmenugl.h
index ff9456acc6..a5ad1964ad 100644
--- a/indra/llui/llmenugl.h
+++ b/indra/llui/llmenugl.h
@@ -37,7 +37,6 @@
 #include "llfloater.h"
 #include "lluistring.h"
 #include "llview.h"
-#include <boost/function.hpp>
 
 extern S32 MENU_BAR_HEIGHT;
 extern S32 MENU_BAR_WIDTH;
diff --git a/indra/llui/llnotifications.h b/indra/llui/llnotifications.h
index 637f0bd88d..d56c459560 100644
--- a/indra/llui/llnotifications.h
+++ b/indra/llui/llnotifications.h
@@ -75,6 +75,7 @@
  *
  */
 
+#include <functional>
 #include <string>
 #include <list>
 #include <vector>
@@ -83,8 +84,6 @@
 #include <iomanip>
 #include <sstream>
 
-#include <boost/utility.hpp>
-#include <boost/type_traits.hpp>
 #include <boost/signals2.hpp>
 #include <boost/range.hpp>
 #include <boost/intrusive_ptr.hpp>
@@ -129,7 +128,7 @@ public:
     virtual void fromLLSD(const LLSD& params) = 0;
 };
 
-typedef boost::function<void (const LLSD&, const LLSD&)> LLNotificationResponder;
+typedef std::function<void (const LLSD&, const LLSD&)> LLNotificationResponder;
 
 typedef std::shared_ptr<LLNotificationResponderInterface> LLNotificationResponderPtr;
 
@@ -669,8 +668,8 @@ namespace LLNotificationFilters
     template<typename T>
     struct filterBy
     {
-        typedef boost::function<T (LLNotificationPtr)>  field_t;
-        typedef typename boost::remove_reference<T>::type       value_t;
+        typedef std::function<T (LLNotificationPtr)>  field_t;
+        typedef typename std::remove_reference<T>::type       value_t;
 
         filterBy(field_t field, value_t value, EComparison comparison = EQUAL)
             :   mField(field),
@@ -715,7 +714,7 @@ namespace LLNotificationComparators
     };
 };
 
-typedef boost::function<bool (LLNotificationPtr)> LLNotificationFilter;
+typedef std::function<bool (LLNotificationPtr)> LLNotificationFilter;
 typedef std::set<LLNotificationPtr, LLNotificationComparators::orderByUUID> LLNotificationSet;
 typedef std::multimap<std::string, LLNotificationPtr> LLNotificationMap;
 
@@ -860,7 +859,7 @@ public:
     S32 size() const;
     size_t size();
 
-    typedef boost::function<void(LLNotificationPtr)> NotificationProcess;
+    typedef std::function<void(LLNotificationPtr)> NotificationProcess;
     void forEachNotification(NotificationProcess process);
 
     std::string summarize();
diff --git a/indra/llui/llnotificationsutil.cpp b/indra/llui/llnotificationsutil.cpp
index c1cad431c5..6b570d043f 100644
--- a/indra/llui/llnotificationsutil.cpp
+++ b/indra/llui/llnotificationsutil.cpp
@@ -71,7 +71,7 @@ LLNotificationPtr LLNotificationsUtil::add(const std::string& name,
 LLNotificationPtr LLNotificationsUtil::add(const std::string& name,
                       const LLSD& substitutions,
                       const LLSD& payload,
-                      boost::function<void (const LLSD&, const LLSD&)> functor)
+                      std::function<void (const LLSD&, const LLSD&)> functor)
 {
     LLNotification::Params::Functor functor_p;
     functor_p.function = functor;
diff --git a/indra/llui/llnotificationsutil.h b/indra/llui/llnotificationsutil.h
index f21d93a50e..73e64e47ba 100644
--- a/indra/llui/llnotificationsutil.h
+++ b/indra/llui/llnotificationsutil.h
@@ -32,7 +32,7 @@
 #include "llnotificationptr.h"
 #include "lluuid.h"
 
-#include <boost/function.hpp>
+#include <functional>
 
 class LLSD;
 
@@ -55,7 +55,7 @@ namespace LLNotificationsUtil
     LLNotificationPtr add(const std::string& name,
                           const LLSD& substitutions,
                           const LLSD& payload,
-                          boost::function<void (const LLSD&, const LLSD&)> functor);
+                          std::function<void (const LLSD&, const LLSD&)> functor);
 
     S32 getSelectedOption(const LLSD& notification, const LLSD& response);
 
diff --git a/indra/llui/llpanel.cpp b/indra/llui/llpanel.cpp
index db314cae0f..2100b23783 100644
--- a/indra/llui/llpanel.cpp
+++ b/indra/llui/llpanel.cpp
@@ -662,12 +662,12 @@ bool LLPanel::childHasFocus(std::string_view id)
 // Prefer getChild<LLUICtrl>("foo")->setCommitCallback(boost:bind(...)),
 // which takes a generic slot.  Or use mCommitCallbackRegistrar.add() with
 // a named callback and reference it in XML.
-void LLPanel::childSetCommitCallback(std::string_view id, boost::function<void (LLUICtrl*,void*)> cb, void* data)
+void LLPanel::childSetCommitCallback(std::string_view id, std::function<void (LLUICtrl*,void*)> cb, void* data)
 {
     LLUICtrl* child = findChild<LLUICtrl>(id);
     if (child)
     {
-        child->setCommitCallback(boost::bind(cb, child, data));
+        child->setCommitCallback(std::bind(cb, child, data));
     }
 }
 
@@ -759,12 +759,12 @@ void LLPanel::childSetAction(std::string_view id, const commit_signal_t::slot_ty
     }
 }
 
-void LLPanel::childSetAction(std::string_view id, boost::function<void(void*)> function, void* value)
+void LLPanel::childSetAction(std::string_view id, std::function<void(void*)> function, void* value)
 {
     LLButton* button = findChild<LLButton>(id);
     if (button)
     {
-        button->setClickedCallback(boost::bind(function, value));
+        button->setClickedCallback(std::bind(function, value));
     }
 }
 
diff --git a/indra/llui/llpanel.h b/indra/llui/llpanel.h
index f085c123c1..fe861dc719 100644
--- a/indra/llui/llpanel.h
+++ b/indra/llui/llpanel.h
@@ -191,7 +191,7 @@ public:
     // Prefer getChild<LLUICtrl>("foo")->setCommitCallback(boost:bind(...)),
     // which takes a generic slot.  Or use mCommitCallbackRegistrar.add() with
     // a named callback and reference it in XML.
-    void childSetCommitCallback(std::string_view id, boost::function<void (LLUICtrl*,void*)> cb, void* data);
+    void childSetCommitCallback(std::string_view id, std::function<void (LLUICtrl*,void*)> cb, void* data);
     void childSetColor(std::string_view id, const LLUIColor& color);
 
     LLCtrlSelectionInterface* childGetSelectionInterface(std::string_view id) const;
@@ -208,7 +208,7 @@ public:
     bool childSetLabelArg(std::string_view id, const std::string& key, const LLStringExplicit& text);
 
     // LLButton
-    void childSetAction(std::string_view id, boost::function<void(void*)> function, void* value);
+    void childSetAction(std::string_view id, std::function<void(void*)> function, void* value);
     void childSetAction(std::string_view id, const commit_signal_t::slot_type& function);
 
     static LLView*  fromXML(LLXMLNodePtr node, LLView *parent, LLXMLNodePtr output_node = NULL);
@@ -262,7 +262,7 @@ extern template class LLPanel* LLView::getChild<class LLPanel>(
     std::string_view name, bool recurse) const;
 #endif
 
-typedef boost::function<LLPanel* (void)> LLPanelClassCreatorFunc;
+typedef std::function<LLPanel* (void)> LLPanelClassCreatorFunc;
 
 // local static instance for registering a particular panel class
 
diff --git a/indra/llui/llresizebar.h b/indra/llui/llresizebar.h
index 68bf0fd95e..d95536c360 100644
--- a/indra/llui/llresizebar.h
+++ b/indra/llui/llresizebar.h
@@ -62,7 +62,7 @@ public:
     void            setEnableSnapping(bool enable) { mSnappingEnabled = enable; }
     void            setAllowDoubleClickSnapping(bool allow) { mAllowDoubleClickSnapping = allow; }
     bool            canResize() const { return getEnabled() && mMaxSize > mMinSize; }
-    void            setResizeListener(boost::function<void(void*)> listener) {mResizeListener = listener;}
+    void            setResizeListener(std::function<void(void*)> listener) { mResizeListener = listener; }
     void            setImagePanel(LLPanel * panelp);
     LLPanel *       getImagePanel() const;
 
@@ -78,7 +78,7 @@ private:
     bool                            mSnappingEnabled,
                                     mAllowDoubleClickSnapping;
     LLView*                         mResizingView;
-    boost::function<void(void*)>    mResizeListener;
+    std::function<void(void*)>    mResizeListener;
     LLPointer<LLUIImage>            mDragHandleImage;
     LLPanel *                       mImagePanel;
 };
diff --git a/indra/llui/llscrollbar.h b/indra/llui/llscrollbar.h
index 9607355a9d..c49d2b534a 100644
--- a/indra/llui/llscrollbar.h
+++ b/indra/llui/llscrollbar.h
@@ -40,7 +40,7 @@ class LLScrollbar
 {
 public:
 
-    typedef boost::function<void (S32, LLScrollbar*)> callback_t;
+    typedef std::function<void (S32, LLScrollbar*)> callback_t;
     struct Params
     :   public LLInitParam::Block<Params, LLUICtrl::Params>
     {
diff --git a/indra/llui/llscrolllistctrl.cpp b/indra/llui/llscrolllistctrl.cpp
index ff77b4d482..b459c67dad 100644
--- a/indra/llui/llscrolllistctrl.cpp
+++ b/indra/llui/llscrolllistctrl.cpp
@@ -190,19 +190,19 @@ LLScrollListCtrl::LLScrollListCtrl(const LLScrollListCtrl::Params& p)
     mColumnsDirty(false),
     mMaxItemCount(INT_MAX),
     mBorderThickness( 2 ),
-    mOnDoubleClickCallback( NULL ),
-    mOnMaximumSelectCallback( NULL ),
-    mOnSortChangedCallback( NULL ),
+    mOnDoubleClickCallback(nullptr),
+    mOnMaximumSelectCallback(nullptr),
+    mOnSortChangedCallback(nullptr),
     mHighlightedItem(-1),
-    mBorder(NULL),
-    mSortCallback(NULL),
+    mBorder(nullptr),
+    mSortCallback(nullptr),
     mNumDynamicWidthColumns(0),
     mTotalStaticColumnWidth(0),
     mTotalColumnPadding(0),
     mSorted(false),
     mDirty(false),
     mOriginalSelection(-1),
-    mLastSelected(NULL),
+    mLastSelected(nullptr),
     mHeadingHeight(p.heading_height),
     mAllowMultipleSelection(p.multi_select),
     mDisplayColumnHeaders(p.draw_heading),
@@ -222,7 +222,7 @@ LLScrollListCtrl::LLScrollListCtrl(const LLScrollListCtrl::Params& p)
     mRowPadding(p.row_padding),
     mAlternateSort(false),
     mContextMenuType(MENU_NONE),
-    mIsFriendSignal(NULL)
+    mIsFriendSignal(nullptr)
 {
     mItemListRect.setOriginAndSize(
         mBorderThickness,
diff --git a/indra/llui/llscrolllistctrl.h b/indra/llui/llscrolllistctrl.h
index 1f04100306..d3735c5052 100644
--- a/indra/llui/llscrolllistctrl.h
+++ b/indra/llui/llscrolllistctrl.h
@@ -77,7 +77,7 @@ public:
     };
 
     // *TODO: Add callbacks to Params
-    typedef boost::function<void (void)> callback_t;
+    typedef std::function<void (void)> callback_t;
 
     template<typename T> struct maximum
     {
@@ -241,7 +241,7 @@ public:
     void            setMaximumSelectCallback( callback_t cb) { mOnMaximumSelectCallback = cb; }
     void            setSortChangedCallback( callback_t cb)  { mOnSortChangedCallback = cb; }
     // Convenience function; *TODO: replace with setter above + boost::bind() in calling code
-    void            setDoubleClickCallback( boost::function<void (void* userdata)> cb, void* userdata) { mOnDoubleClickCallback = boost::bind(cb, userdata); }
+    void            setDoubleClickCallback( std::function<void (void* userdata)> cb, void* userdata) { mOnDoubleClickCallback = std::bind(cb, userdata); }
 
     void            swapWithNext(S32 index);
     void            swapWithPrevious(S32 index);
diff --git a/indra/llui/llsearcheditor.cpp b/indra/llui/llsearcheditor.cpp
index a0c1e9d0c0..244faf8fe9 100644
--- a/indra/llui/llsearcheditor.cpp
+++ b/indra/llui/llsearcheditor.cpp
@@ -106,12 +106,12 @@ LLSearchEditor::LLSearchEditor(const LLSearchEditor::Params& p)
 
 LLSearchEditor::~LLSearchEditor()
 {
-    mKeystrokeCallback = NULL;
-    mTextChangedCallback = NULL;
+    mKeystrokeCallback   = nullptr;
+    mTextChangedCallback = nullptr;
     setCommitOnFocusLost(false);
 
-    mSearchButton = NULL;
-    mClearButton = NULL;
+    mSearchButton = nullptr;
+    mClearButton  = nullptr;
     mSearchEditor->deleteAllChildren();
     deleteAllChildren();
 }
diff --git a/indra/llui/lltextbox.cpp b/indra/llui/lltextbox.cpp
index 9f945d3735..d2a21998a6 100644
--- a/indra/llui/lltextbox.cpp
+++ b/indra/llui/lltextbox.cpp
@@ -43,7 +43,7 @@ template class LLTextBox* LLView::getChild<class LLTextBox>(
 
 LLTextBox::LLTextBox(const LLTextBox::Params& p)
 :   LLTextBase(p),
-    mClickedCallback(NULL),
+    mClickedCallback(nullptr),
     mShowCursorHand(true)
 {
     mSkipTripleClick = true;
@@ -135,9 +135,9 @@ void LLTextBox::setText(const LLStringExplicit& text , const LLStyle::Params& in
     LLTextBase::setText(mText.getString(), input_params );
 }
 
-void LLTextBox::setClickedCallback( boost::function<void (void*)> cb, void* userdata /*= NULL */ )
+void LLTextBox::setClickedCallback(std::function<void (void*)> cb, void* userdata /*= nullptr */)
 {
-    mClickedCallback = boost::bind(cb, userdata);
+    mClickedCallback = std::bind(cb, userdata);
 }
 
 S32 LLTextBox::getTextPixelWidth()
diff --git a/indra/llui/lltextbox.h b/indra/llui/lltextbox.h
index 507d8f3ee6..8716917ced 100644
--- a/indra/llui/lltextbox.h
+++ b/indra/llui/lltextbox.h
@@ -36,7 +36,7 @@ class LLTextBox :
 public:
 
     // *TODO: Add callback to Params
-    typedef boost::function<void (void)> callback_t;
+    typedef std::function<void (void)> callback_t;
 
     struct Params : public LLInitParam::Block<Params, LLTextBase::Params>
     {};
@@ -58,7 +58,7 @@ public:
 
     void setRightAlign() { mHAlign = LLFontGL::RIGHT; }
     void setHAlign(LLFontGL::HAlign align) { mHAlign = align; }
-    void setClickedCallback(boost::function<void(void*)> cb, void* userdata = NULL);
+    void setClickedCallback(std::function<void(void*)> cb, void* userdata = nullptr);
 
     void reshapeToFitText(bool called_from_parent = false);
 
diff --git a/indra/llui/lltexteditor.cpp b/indra/llui/lltexteditor.cpp
index 58b785fcdd..fcdf3782ae 100644
--- a/indra/llui/lltexteditor.cpp
+++ b/indra/llui/lltexteditor.cpp
@@ -1242,7 +1242,7 @@ void LLTextEditor::addChar(llwchar wc)
     tryToShowEmojiHelper();
     tryToShowMentionHelper();
 
-    if (!mReadOnly && mAutoreplaceCallback != NULL)
+    if (!mReadOnly && mAutoreplaceCallback != nullptr)
     {
         // autoreplace the text, if necessary
         S32 replacement_start;
diff --git a/indra/llui/lltexteditor.h b/indra/llui/lltexteditor.h
index cdfcbcdd63..d9742db34d 100644
--- a/indra/llui/lltexteditor.h
+++ b/indra/llui/lltexteditor.h
@@ -164,7 +164,7 @@ public:
     bool            allowsEmbeddedItems() const { return mAllowEmbeddedItems; }
 
     // Autoreplace (formerly part of LLLineEditor)
-    typedef boost::function<void(S32&, S32&, LLWString&, S32&, const LLWString&)> autoreplace_callback_t;
+    typedef std::function<void(S32&, S32&, LLWString&, S32&, const LLWString&)> autoreplace_callback_t;
     autoreplace_callback_t mAutoreplaceCallback;
     void            setAutoreplaceCallback(autoreplace_callback_t cb) { mAutoreplaceCallback = cb; }
 
diff --git a/indra/llui/lltextutil.cpp b/indra/llui/lltextutil.cpp
index 8ffce1b8b4..1454de34c7 100644
--- a/indra/llui/lltextutil.cpp
+++ b/indra/llui/lltextutil.cpp
@@ -30,7 +30,7 @@
 #include "lltextbox.h"
 #include "llurlmatch.h"
 
-boost::function<bool(LLUrlMatch*,LLTextBase*)>  LLTextUtil::TextHelpers::iconCallbackCreationFunction = 0;
+std::function<bool(LLUrlMatch*, LLTextBase*)> LLTextUtil::TextHelpers::iconCallbackCreationFunction = nullptr;
 
 void LLTextUtil::textboxSetHighlightedVal(LLTextBox *txtbox, const LLStyle::Params& normal_style, const std::string& text, const std::string& hl)
 {
diff --git a/indra/llui/lltextutil.h b/indra/llui/lltextutil.h
index f3838e59fa..6328ff133f 100644
--- a/indra/llui/lltextutil.h
+++ b/indra/llui/lltextutil.h
@@ -74,7 +74,7 @@ namespace LLTextUtil
         //we need this special callback since we need to create LLAvataIconCtrls while parsing
         //avatar/group url but can't create LLAvataIconCtrl from LLUI
         public:
-            static boost::function<bool(LLUrlMatch*,LLTextBase*)> iconCallbackCreationFunction;
+            static std::function<bool(LLUrlMatch*,LLTextBase*)> iconCallbackCreationFunction;
     };
 
 
diff --git a/indra/llui/lltextvalidate.h b/indra/llui/lltextvalidate.h
index a4ff144d82..096c28b448 100644
--- a/indra/llui/lltextvalidate.h
+++ b/indra/llui/lltextvalidate.h
@@ -30,7 +30,6 @@
 
 #include "llstring.h"
 #include "llinitparam.h"
-#include <boost/function.hpp>
 
 namespace LLTextValidate
 {
diff --git a/indra/llui/lltoolbar.cpp b/indra/llui/lltoolbar.cpp
index 56ab6e9bae..785dc85448 100644
--- a/indra/llui/lltoolbar.cpp
+++ b/indra/llui/lltoolbar.cpp
@@ -99,8 +99,8 @@ LLToolBar::LLToolBar(const LLToolBar::Params& p)
     mWrap(p.wrap),
     mNeedsLayout(false),
     mModified(false),
-    mButtonPanel(NULL),
-    mCenteringStack(NULL),
+    mButtonPanel(nullptr),
+    mCenteringStack(nullptr),
     mPadLeft(p.pad_left),
     mPadRight(p.pad_right),
     mPadTop(p.pad_top),
@@ -108,17 +108,17 @@ LLToolBar::LLToolBar(const LLToolBar::Params& p)
     mPadBetween(p.pad_between),
     mMinGirth(p.min_girth),
     mPopupMenuHandle(),
-    mRightMouseTargetButton(NULL),
-    mStartDragItemCallback(NULL),
-    mHandleDragItemCallback(NULL),
-    mHandleDropCallback(NULL),
-    mButtonAddSignal(NULL),
-    mButtonEnterSignal(NULL),
-    mButtonLeaveSignal(NULL),
-    mButtonRemoveSignal(NULL),
+    mRightMouseTargetButton(nullptr),
+    mStartDragItemCallback(nullptr),
+    mHandleDragItemCallback(nullptr),
+    mHandleDropCallback(nullptr),
+    mButtonAddSignal(nullptr),
+    mButtonEnterSignal(nullptr),
+    mButtonLeaveSignal(nullptr),
+    mButtonRemoveSignal(nullptr),
     mDragAndDropTarget(false),
-    mCaretIcon(NULL),
-    mCenterPanel(NULL)
+    mCaretIcon(nullptr),
+    mCenterPanel(nullptr)
 {
     mButtonParams[LLToolBarEnums::BTNTYPE_ICONS_WITH_TEXT] = p.button_icon_and_text;
     mButtonParams[LLToolBarEnums::BTNTYPE_ICONS_ONLY] = p.button_icon;
@@ -1097,12 +1097,12 @@ LLToolBarButton::LLToolBarButton(const Params& p)
     mWidthRange(p.button_width),
     mDesiredHeight(p.desired_height),
     mId(""),
-    mIsEnabledSignal(NULL),
-    mIsRunningSignal(NULL),
-    mIsStartingSignal(NULL),
+    mIsEnabledSignal(nullptr),
+    mIsRunningSignal(nullptr),
+    mIsStartingSignal(nullptr),
     mIsDragged(false),
-    mStartDragItemCallback(NULL),
-    mHandleDragItemCallback(NULL),
+    mStartDragItemCallback(nullptr),
+    mHandleDragItemCallback(nullptr),
     mOriginalImageSelected(p.image_selected),
     mOriginalImageUnselected(p.image_unselected),
     mOriginalImagePressed(p.image_pressed),
@@ -1256,7 +1256,7 @@ void LLToolBar::LLCenterLayoutPanel::handleReshape(const LLRect& rect, bool by_u
 {
     LLLayoutPanel::handleReshape(rect, by_user);
 
-    if (!mReshapeCallback.empty())
+    if (mReshapeCallback != nullptr)
     {
         LLRect r;
         localRectToOtherView(mButtonPanel->getRect(), &r, gFloaterView);
diff --git a/indra/llui/lltoolbar.h b/indra/llui/lltoolbar.h
index a3f044c256..abf44f259a 100644
--- a/indra/llui/lltoolbar.h
+++ b/indra/llui/lltoolbar.h
@@ -39,9 +39,9 @@ class LLToolBar;
 class LLToolBarButton;
 class LLIconCtrl;
 
-typedef boost::function<void (S32 x, S32 y, LLToolBarButton* button)> tool_startdrag_callback_t;
-typedef boost::function<bool (S32 x, S32 y, const LLUUID& uuid, LLAssetType::EType type)> tool_handledrag_callback_t;
-typedef boost::function<bool (void* data, EDragAndDropType cargo_type, S32 x, S32 y, LLToolBar* toolbar)> tool_handledrop_callback_t;
+typedef std::function<void (S32 x, S32 y, LLToolBarButton* button)> tool_startdrag_callback_t;
+typedef std::function<bool (S32 x, S32 y, const LLUUID& uuid, LLAssetType::EType type)> tool_handledrag_callback_t;
+typedef std::function<bool (void* data, EDragAndDropType cargo_type, S32 x, S32 y, LLToolBar* toolbar)> tool_handledrop_callback_t;
 
 class LLToolBarButton : public LLButton
 {
@@ -167,7 +167,7 @@ public:
     class LLCenterLayoutPanel : public LLLayoutPanel
     {
     public:
-        typedef boost::function<void(LLToolBarEnums::EToolBarLocation tb, const LLRect& rect)> reshape_callback_t;
+        typedef std::function<void(LLToolBarEnums::EToolBarLocation tb, const LLRect& rect)> reshape_callback_t;
 
         virtual ~LLCenterLayoutPanel() {}
         /*virtual*/ void handleReshape(const LLRect& rect, bool by_user);
diff --git a/indra/llui/lltooltip.h b/indra/llui/lltooltip.h
index 760acddd6f..c9d6937c1a 100644
--- a/indra/llui/lltooltip.h
+++ b/indra/llui/lltooltip.h
@@ -67,8 +67,8 @@ public:
 
     struct Params : public LLInitParam::Block<Params, LLPanel::Params>
     {
-        typedef boost::function<void(void)> click_callback_t;
-        typedef boost::function<LLToolTip*(LLToolTip::Params)> create_callback_t;
+        typedef std::function<void(void)> click_callback_t;
+        typedef std::function<LLToolTip*(LLToolTip::Params)> create_callback_t;
 
         Optional<std::string>       message;
         Multiple<StyledText>        styled_message;
diff --git a/indra/llui/llui.h b/indra/llui/llui.h
index b2dcb6dc88..2ef64baaf6 100644
--- a/indra/llui/llui.h
+++ b/indra/llui/llui.h
@@ -241,9 +241,9 @@ public:
     //
     // Methods
     //
-    typedef boost::function<void(LLView*)> add_popup_t;
-    typedef boost::function<void(LLView*)> remove_popup_t;
-    typedef boost::function<void(void)> clear_popups_t;
+    typedef std::function<void(LLView*)> add_popup_t;
+    typedef std::function<void(LLView*)> remove_popup_t;
+    typedef std::function<void(void)> clear_popups_t;
 
     void setPopupFuncs(const add_popup_t& add_popup, const remove_popup_t&, const clear_popups_t& );
 
diff --git a/indra/llui/lluictrl.cpp b/indra/llui/lluictrl.cpp
index cbabb5a933..05461edd82 100644
--- a/indra/llui/lluictrl.cpp
+++ b/indra/llui/lluictrl.cpp
@@ -999,15 +999,16 @@ bool LLUICtrl::findHelpTopic(std::string& help_topic_out)
 }
 
 // *TODO: Deprecate; for backwards compatability only:
-boost::signals2::connection LLUICtrl::setCommitCallback( boost::function<void (LLUICtrl*,void*)> cb, void* data)
+boost::signals2::connection LLUICtrl::setCommitCallback( std::function<void (LLUICtrl*,void*)> cb, void* data)
 {
-    return setCommitCallback( boost::bind(cb, _1, data));
+    return setCommitCallback( std::bind(cb, std::placeholders::_1, data));
 }
-boost::signals2::connection LLUICtrl::setValidateBeforeCommit( boost::function<bool (const LLSD& data)> cb )
+
+boost::signals2::connection LLUICtrl::setValidateBeforeCommit( std::function<bool (const LLSD& data)> cb )
 {
     if (!mValidateSignal) mValidateSignal = new enable_signal_t();
 
-    return mValidateSignal->connect(boost::bind(cb, _2));
+    return mValidateSignal->connect(std::bind(cb, std::placeholders::_2));
 }
 
 // virtual
diff --git a/indra/llui/lluictrl.h b/indra/llui/lluictrl.h
index bcaf479b0f..940951bcf7 100644
--- a/indra/llui/lluictrl.h
+++ b/indra/llui/lluictrl.h
@@ -31,7 +31,7 @@
 //#include "llboost.h"
 #include "llrect.h"
 #include "llsd.h"
-#include <boost/function.hpp>
+#include <functional>
 #include <boost/signals2.hpp>
 
 #include "llinitparam.h"
@@ -47,12 +47,12 @@ class LLUICtrl
     : public LLView, public boost::signals2::trackable
 {
 public:
-    typedef boost::function<void (LLUICtrl* ctrl, const LLSD& param)> commit_callback_t;
+    typedef std::function<void (LLUICtrl* ctrl, const LLSD& param)> commit_callback_t;
     typedef boost::signals2::signal<void (LLUICtrl* ctrl, const LLSD& param)> commit_signal_t;
     // *TODO: add xml support for this type of signal in the future
     typedef boost::signals2::signal<void (LLUICtrl* ctrl, S32 x, S32 y, MASK mask)> mouse_signal_t;
 
-    typedef boost::function<bool (LLUICtrl* ctrl, const LLSD& param)> enable_callback_t;
+    typedef std::function<bool (LLUICtrl* ctrl, const LLSD& param)> enable_callback_t;
     typedef boost::signals2::signal<bool (LLUICtrl* ctrl, const LLSD& param), boost_boolean_combiner> enable_signal_t;
 
     struct CallbackParam : public LLInitParam::Block<CallbackParam>
@@ -258,8 +258,8 @@ public:
     boost::signals2::connection setDoubleClickCallback( const mouse_signal_t::slot_type& cb );
 
     // *TODO: Deprecate; for backwards compatability only:
-    boost::signals2::connection setCommitCallback( boost::function<void (LLUICtrl*,void*)> cb, void* data);
-    boost::signals2::connection setValidateBeforeCommit( boost::function<bool (const LLSD& data)> cb );
+    boost::signals2::connection setCommitCallback( std::function<void (LLUICtrl*,void*)> cb, void* data);
+    boost::signals2::connection setValidateBeforeCommit( std::function<bool (const LLSD& data)> cb );
 
     LLUICtrl* findRootMostFocusRoot();
 
diff --git a/indra/llui/lluictrlfactory.h b/indra/llui/lluictrlfactory.h
index 91221dc7f3..fc069c078f 100644
--- a/indra/llui/lluictrlfactory.h
+++ b/indra/llui/lluictrlfactory.h
@@ -311,7 +311,7 @@ LLUICtrlFactory::ParamDefaults<LLInitParam::BaseBlock, DUMMY>::ParamDefaults() {
 template<typename DERIVED>
 template<typename T>
 LLChildRegistry<DERIVED>::Register<T>::Register(const char* tag, LLWidgetCreatorFunc func)
-:   LLChildRegistry<DERIVED>::StaticRegistrar(tag, func.empty() ? (LLWidgetCreatorFunc)&LLUICtrlFactory::defaultBuilder<T> : func)
+:   LLChildRegistry<DERIVED>::StaticRegistrar(tag, func == nullptr ? (LLWidgetCreatorFunc)&LLUICtrlFactory::defaultBuilder<T> : func)
 {
     // add this widget to various registries
     LLUICtrlFactory::instance().registerWidget(&typeid(T), &typeid(typename T::Params), tag);
diff --git a/indra/llui/llurlaction.h b/indra/llui/llurlaction.h
index 56d459bb26..c4cfd0f3fb 100644
--- a/indra/llui/llurlaction.h
+++ b/indra/llui/llurlaction.h
@@ -28,8 +28,8 @@
 #ifndef LL_LLURLACTION_H
 #define LL_LLURLACTION_H
 
+#include <functional>
 #include <string>
-#include <boost/function.hpp>
 
 ///
 /// The LLUrlAction class provides a number of static functions that
@@ -93,8 +93,8 @@ public:
     static void unblockObject(std::string url);
 
     /// specify the callbacks to enable this class's functionality
-    typedef boost::function<void (const std::string&)> url_callback_t;
-    typedef boost::function<bool(const std::string& url, bool trusted_content)> execute_url_callback_t;
+    typedef std::function<void (const std::string&)> url_callback_t;
+    typedef std::function<bool(const std::string& url, bool trusted_content)> execute_url_callback_t;
 
     static void setOpenURLCallback(url_callback_t cb);
     static void setOpenURLInternalCallback(url_callback_t cb);
diff --git a/indra/llui/llview.h b/indra/llui/llview.h
index 5695776ae6..d747ef9555 100644
--- a/indra/llui/llview.h
+++ b/indra/llui/llview.h
@@ -48,8 +48,8 @@
 #include "lltreeiterators.h"
 #include "llfocusmgr.h"
 
+#include <functional>
 #include <list>
-#include <boost/function.hpp>
 
 class LLSD;
 
@@ -626,7 +626,7 @@ private:
     LLView& getDefaultWidgetContainer() const;
 
     // This allows special mouse-event targeting logic for testing.
-    typedef boost::function<bool(const LLView*, S32 x, S32 y)> DrilldownFunc;
+    typedef std::function<bool(const LLView*, S32 x, S32 y)> DrilldownFunc;
     static DrilldownFunc sDrilldown;
 
 public:
diff --git a/indra/llui/llxuiparser.h b/indra/llui/llxuiparser.h
index f755c12cbf..2179ae54d3 100644
--- a/indra/llui/llxuiparser.h
+++ b/indra/llui/llxuiparser.h
@@ -31,7 +31,7 @@
 #include "llregistry.h"
 #include "llxmlnode.h"
 
-#include <boost/function.hpp>
+#include <functional>
 #include <iosfwd>
 #include <stack>
 #include <set>
@@ -47,7 +47,7 @@ class LLWidgetTypeRegistry
 
 
 // global static instance for registering all widget types
-typedef boost::function<LLView* (LLXMLNodePtr node, LLView *parent, LLXMLNodePtr output_node)> LLWidgetCreatorFunc;
+typedef std::function<LLView* (LLXMLNodePtr node, LLView *parent, LLXMLNodePtr output_node)> LLWidgetCreatorFunc;
 
 typedef LLRegistry<std::string, LLWidgetCreatorFunc> widget_registry_t;
 
-- 
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