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/llcommon/llcallbacklist.h                 |  9 +++---
 indra/llcommon/llcoros.h                        |  4 +--
 indra/llcommon/lldependencies.h                 | 14 ++++-----
 indra/llcommon/lldoubledispatch.h               | 14 ++++-----
 indra/llcommon/llerror.cpp                      |  6 ++--
 indra/llcommon/llerrorcontrol.h                 |  4 +--
 indra/llcommon/lleventdispatcher.h              |  5 ++--
 indra/llcommon/lleventfilter.h                  |  7 +++--
 indra/llcommon/llevents.cpp                     |  1 -
 indra/llcommon/llevents.h                       |  3 --
 indra/llcommon/llhandle.h                       |  6 ++--
 indra/llcommon/llinitdestroyclass.h             |  4 +--
 indra/llcommon/llinitparam.h                    | 35 +++++++++++++++++-----
 indra/llcommon/llleaplistener.h                 |  4 +--
 indra/llcommon/llpounceable.h                   |  5 ++--
 indra/llcommon/llptrto.cpp                      | 39 ++++++++++++-------------
 indra/llcommon/llptrto.h                        |  8 ++---
 indra/llcommon/llsdparam.cpp                    | 11 +++----
 indra/llcommon/llsdparam.h                      |  4 +--
 indra/llcommon/llsys.cpp                        |  7 ++---
 indra/llcommon/lltreeiterators.h                | 10 +++----
 indra/llcommon/tests/lleventdispatcher_test.cpp |  1 -
 indra/llcommon/tests/llprocess_test.cpp         | 11 +++++--
 indra/llcommon/tests/lltreeiterators_test.cpp   |  3 +-
 24 files changed, 113 insertions(+), 102 deletions(-)

(limited to 'indra/llcommon')

diff --git a/indra/llcommon/llcallbacklist.h b/indra/llcommon/llcallbacklist.h
index d6c415f7c5..036e575117 100644
--- a/indra/llcommon/llcallbacklist.h
+++ b/indra/llcommon/llcallbacklist.h
@@ -27,8 +27,9 @@
 #ifndef LL_LLCALLBACKLIST_H
 #define LL_LLCALLBACKLIST_H
 
-#include "llstl.h"
-#include <boost/function.hpp>
+#include "stdtypes.h"
+
+#include <functional>
 #include <list>
 
 class LLCallbackList
@@ -59,8 +60,8 @@ protected:
     callback_list_t mCallbackList;
 };
 
-typedef boost::function<void ()> nullary_func_t;
-typedef boost::function<bool ()> bool_func_t;
+typedef std::function<void ()> nullary_func_t;
+typedef std::function<bool ()> bool_func_t;
 
 // Call a given callable once in idle loop.
 void doOnIdleOneTime(nullary_func_t callable);
diff --git a/indra/llcommon/llcoros.h b/indra/llcommon/llcoros.h
index c3820ae987..9df52b6ed5 100644
--- a/indra/llcommon/llcoros.h
+++ b/indra/llcommon/llcoros.h
@@ -37,7 +37,7 @@
 #include "mutex.h"
 #include "llsingleton.h"
 #include "llinstancetracker.h"
-#include <boost/function.hpp>
+#include <functional>
 #include <string>
 #include <exception>
 #include <queue>
@@ -112,7 +112,7 @@ public:
     /// stuck with the term "coroutine."
     typedef boost::fibers::fiber coro;
     /// Canonical callable type
-    typedef boost::function<void()> callable_t;
+    typedef std::function<void()> callable_t;
 
     /**
      * Create and start running a new coroutine with specified name. The name
diff --git a/indra/llcommon/lldependencies.h b/indra/llcommon/lldependencies.h
index 47b6fedc7d..a1b5c83caf 100644
--- a/indra/llcommon/lldependencies.h
+++ b/indra/llcommon/lldependencies.h
@@ -30,6 +30,7 @@
 #if ! defined(LL_LLDEPENDENCIES_H)
 #define LL_LLDEPENDENCIES_H
 
+#include <functional>
 #include <string>
 #include <vector>
 #include <set>
@@ -38,7 +39,6 @@
 #include <boost/iterator/transform_iterator.hpp>
 #include <boost/iterator/indirect_iterator.hpp>
 #include <boost/range/iterator_range.hpp>
-#include <boost/function.hpp>
 #include <boost/bind.hpp>
 #include "llexception.h"
 
@@ -217,7 +217,7 @@ class LLDependencies: public LLDependenciesBase
     /// We have various ways to get the dependencies for a given DepNode.
     /// Rather than having to restate each one for 'after' and 'before'
     /// separately, pass a dep_selector so we can apply each to either.
-    typedef boost::function<const typename DepNode::dep_set&(const DepNode&)> dep_selector;
+    typedef std::function<const typename DepNode::dep_set&(const DepNode&)> dep_selector;
 
 public:
     LLDependencies() {}
@@ -340,7 +340,7 @@ private:
 
 public:
     /// iterator over value_type entries
-    typedef boost::transform_iterator<boost::function<value_type(DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<value_type(DepNodeMapEntry&)>,
                                       typename DepNodeMap::iterator> iterator;
     /// range over value_type entries
     typedef boost::iterator_range<iterator> range;
@@ -352,7 +352,7 @@ public:
     }
 
     /// iterator over const_value_type entries
-    typedef boost::transform_iterator<boost::function<const_value_type(const DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<const_value_type(const DepNodeMapEntry&)>,
                                       typename DepNodeMap::const_iterator> const_iterator;
     /// range over const_value_type entries
     typedef boost::iterator_range<const_iterator> const_range;
@@ -364,7 +364,7 @@ public:
     }
 
     /// iterator over stored NODEs
-    typedef boost::transform_iterator<boost::function<NODE&(DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<NODE&(DepNodeMapEntry&)>,
                                       typename DepNodeMap::iterator> node_iterator;
     /// range over stored NODEs
     typedef boost::iterator_range<node_iterator> node_range;
@@ -380,7 +380,7 @@ public:
     }
 
     /// const iterator over stored NODEs
-    typedef boost::transform_iterator<boost::function<const NODE&(const DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<const NODE&(const DepNodeMapEntry&)>,
                                       typename DepNodeMap::const_iterator> const_node_iterator;
     /// const range over stored NODEs
     typedef boost::iterator_range<const_node_iterator> const_node_range;
@@ -396,7 +396,7 @@ public:
     }
 
     /// const iterator over stored KEYs
-    typedef boost::transform_iterator<boost::function<const KEY&(const DepNodeMapEntry&)>,
+    typedef boost::transform_iterator<std::function<const KEY&(const DepNodeMapEntry&)>,
                                       typename DepNodeMap::const_iterator> const_key_iterator;
     /// const range over stored KEYs
     typedef boost::iterator_range<const_key_iterator> const_key_range;
diff --git a/indra/llcommon/lldoubledispatch.h b/indra/llcommon/lldoubledispatch.h
index 25039c3e9c..ad4dc57d58 100644
--- a/indra/llcommon/lldoubledispatch.h
+++ b/indra/llcommon/lldoubledispatch.h
@@ -30,9 +30,7 @@
 #define LL_LLDOUBLEDISPATCH_H
 
 #include <list>
-#include <boost/function.hpp>
-#include <boost/bind.hpp>
-#include <boost/ref.hpp>
+#include <functional>
 
 /**
  * This class supports function calls which are virtual on the dynamic type of
@@ -156,9 +154,9 @@ public:
         insert(t1, t2, func);
         if (symmetrical)
         {
-            // Use boost::bind() to construct a param-swapping thunk. Don't
+            // Use std::bind() to construct a param-swapping thunk. Don't
             // forget to reverse the parameters too.
-            insert(t2, t1, boost::bind(func, _2, _1));
+            insert(t2, t1, std::bind(func, std::placeholders::_2, std::placeholders::_1));
         }
     }
 
@@ -193,7 +191,7 @@ public:
         insert(Type<Type1>(), Type<Type2>(), func, insertion);
         if (symmetrical)
         {
-            insert(Type<Type2>(), Type<Type1>(), boost::bind(func, _2, _1), insertion);
+            insert(Type<Type2>(), Type<Type1>(), std::bind(func, std::placeholders::_2, std::placeholders::_1), insertion);
         }
     }
 
@@ -271,8 +269,8 @@ private:
     typename DispatchTable::iterator find(const ParamBaseType& param1, const ParamBaseType& param2)
     {
         return std::find_if(mDispatch.begin(), mDispatch.end(),
-                            boost::bind(&EntryBase::matches, _1,
-                                        boost::ref(param1), boost::ref(param2)));
+                            std::bind(&EntryBase::matches, std::placeholders::_1,
+                                        std::ref(param1), std::ref(param2)));
     }
 
     /// Look up the first matching entry.
diff --git a/indra/llcommon/llerror.cpp b/indra/llcommon/llerror.cpp
index 3411e9c6bb..b14464382b 100644
--- a/indra/llcommon/llerror.cpp
+++ b/indra/llcommon/llerror.cpp
@@ -527,8 +527,8 @@ namespace
         mFileLevelMap(),
         mTagLevelMap(),
         mUniqueLogMessages(),
-        mCrashFunction(NULL),
-        mTimeFunction(NULL),
+        mCrashFunction(nullptr),
+        mTimeFunction(nullptr),
         mRecorders(),
         mShouldLogCallCounter(0)
     {
@@ -1231,7 +1231,7 @@ namespace
 
             std::ostringstream message_stream;
 
-            if (r->wantsTime() && s->mTimeFunction != NULL)
+            if (r->wantsTime() && s->mTimeFunction != nullptr)
             {
                 message_stream << s->mTimeFunction();
             }
diff --git a/indra/llcommon/llerrorcontrol.h b/indra/llcommon/llerrorcontrol.h
index 0a7b3d2046..d254fa5407 100644
--- a/indra/llcommon/llerrorcontrol.h
+++ b/indra/llcommon/llerrorcontrol.h
@@ -31,7 +31,7 @@
 #include "llerror.h"
 #include "llpointer.h"
 #include "llrefcount.h"
-#include "boost/function.hpp"
+#include <functional>
 #include <string>
 
 class LLSD;
@@ -92,7 +92,7 @@ namespace LLError
         Control functions.
     */
 
-    typedef boost::function<void(const std::string&)> FatalFunction;
+    typedef std::function<void(const std::string&)> FatalFunction;
 
     LL_COMMON_API void setFatalFunction(const FatalFunction&);
         // The fatal function will be called after an message of LEVEL_ERROR
diff --git a/indra/llcommon/lleventdispatcher.h b/indra/llcommon/lleventdispatcher.h
index 27cf4c1974..97a60e2829 100644
--- a/indra/llcommon/lleventdispatcher.h
+++ b/indra/llcommon/lleventdispatcher.h
@@ -33,7 +33,6 @@
 #define LL_LLEVENTDISPATCHER_H
 
 #include <boost/fiber/fss.hpp>
-#include <boost/function_types/is_member_function_pointer.hpp>
 #include <boost/function_types/is_nonmember_callable_builtin.hpp>
 #include <boost/iterator/transform_iterator.hpp>
 #include <functional>               // std::function
@@ -316,7 +315,7 @@ public:
      */
     template<typename Method, typename InstanceGetter,
              typename = typename std::enable_if<
-                 boost::function_types::is_member_function_pointer<Method>::value &&
+                 std::is_member_function_pointer<Method>::value &&
                  ! std::is_convertible<InstanceGetter, LLSD>::value
              >::type>
     void add(const std::string& name, const std::string& desc, Method f,
@@ -362,7 +361,7 @@ public:
      */
     template<typename Method, typename InstanceGetter,
              typename = typename std::enable_if<
-                 boost::function_types::is_member_function_pointer<Method>::value &&
+                 std::is_member_function_pointer<Method>::value &&
                  ! std::is_convertible<InstanceGetter, LLSD>::value
              >::type>
     void add(const std::string& name, const std::string& desc, Method f,
diff --git a/indra/llcommon/lleventfilter.h b/indra/llcommon/lleventfilter.h
index d8c7e15a27..8b917c23be 100644
--- a/indra/llcommon/lleventfilter.h
+++ b/indra/llcommon/lleventfilter.h
@@ -33,7 +33,8 @@
 #include "stdtypes.h"
 #include "lltimer.h"
 #include "llsdutil.h"
-#include <boost/function.hpp>
+
+#include <functional>
 
 class LLEventTimer;
 class LLDate;
@@ -92,8 +93,8 @@ public:
     /// construct and connect
     LLEventTimeoutBase(LLEventPump& source);
 
-    /// Callable, can be constructed with boost::bind()
-    typedef boost::function<void()> Action;
+    /// Callable, can be constructed with std::bind()
+    typedef std::function<void()> Action;
 
     /**
      * Start countdown timer for the specified number of @a seconds. Forward
diff --git a/indra/llcommon/llevents.cpp b/indra/llcommon/llevents.cpp
index 3c6743eac9..9a5324b598 100644
--- a/indra/llcommon/llevents.cpp
+++ b/indra/llcommon/llevents.cpp
@@ -44,7 +44,6 @@
 #include <cmath>
 #include <cctype>
 // external library headers
-#include <boost/range/iterator_range.hpp>
 #if LL_WINDOWS
 #pragma warning (push)
 #pragma warning (disable : 4701) // compiler thinks might use uninitialized var, but no
diff --git a/indra/llcommon/llevents.h b/indra/llcommon/llevents.h
index 054e57cc6c..18c05a0081 100644
--- a/indra/llcommon/llevents.h
+++ b/indra/llcommon/llevents.h
@@ -42,9 +42,6 @@
 #include <boost/signals2.hpp>
 #include <boost/bind.hpp>
 #include <boost/optional/optional.hpp>
-#include <boost/visit_each.hpp>
-#include <boost/ref.hpp>            // reference_wrapper
-#include <boost/type_traits/is_pointer.hpp>
 #include <boost/static_assert.hpp>
 #include "llsd.h"
 #include "llsingleton.h"
diff --git a/indra/llcommon/llhandle.h b/indra/llcommon/llhandle.h
index ceea1d9c48..fd7d32e79a 100644
--- a/indra/llcommon/llhandle.h
+++ b/indra/llcommon/llhandle.h
@@ -31,8 +31,6 @@
 #include "llrefcount.h"
 #include "llexception.h"
 #include <stdexcept>
-#include <boost/type_traits/is_convertible.hpp>
-#include <boost/utility/enable_if.hpp>
 #include <boost/throw_exception.hpp>
 
 /**
@@ -90,7 +88,7 @@ public:
     LLHandle() : mTombStone(getDefaultTombStone()) {}
 
     template<typename U>
-    LLHandle(const LLHandle<U>& other, typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0)
+    LLHandle(const LLHandle<U>& other, typename std::enable_if_t<std::is_convertible_v<U*, T*>>* dummy = 0)
     : mTombStone(other.mTombStone)
     {}
 
@@ -199,7 +197,7 @@ public:
     }
 
     template <typename U>
-    LLHandle<U> getDerivedHandle(typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0) const
+    LLHandle<U> getDerivedHandle(typename std::enable_if_t<std::is_convertible_v<U*, T*> >* dummy = 0) const
     {
         LLHandle<U> downcast_handle;
         downcast_handle.mTombStone = getHandle().mTombStone;
diff --git a/indra/llcommon/llinitdestroyclass.h b/indra/llcommon/llinitdestroyclass.h
index 2354c9f2ed..7cc9c6b930 100644
--- a/indra/llcommon/llinitdestroyclass.h
+++ b/indra/llcommon/llinitdestroyclass.h
@@ -37,7 +37,7 @@
 #define LL_LLINITDESTROYCLASS_H
 
 #include "llsingleton.h"
-#include <boost/function.hpp>
+#include <functional>
 #include <typeinfo>
 #include <vector>
 #include <utility>                  // std::pair
@@ -50,7 +50,7 @@
 class LLCallbackRegistry
 {
 public:
-    typedef boost::function<void()> func_t;
+    typedef std::function<void()> func_t;
 
     void registerCallback(const std::string& name, const func_t& func)
     {
diff --git a/indra/llcommon/llinitparam.h b/indra/llcommon/llinitparam.h
index 32d7b17034..b01ea0bfb1 100644
--- a/indra/llcommon/llinitparam.h
+++ b/indra/llcommon/llinitparam.h
@@ -28,11 +28,12 @@
 #ifndef LL_LLPARAM_H
 #define LL_LLPARAM_H
 
+#include <functional>
+#include <type_traits>
 #include <vector>
 #include <list>
+#include <unordered_map>
 #include <boost/function.hpp>
-#include <boost/type_traits/is_convertible.hpp>
-#include <boost/type_traits/is_enum.hpp>
 #include <boost/unordered_map.hpp>
 
 #include "llerror.h"
@@ -105,6 +106,26 @@ namespace LLTypeTags
     };
 }
 
+namespace ll
+{
+    // Primary template: general case is false
+    template<typename T>
+    struct is_std_function : std::false_type
+    {
+    };
+
+    // Specialization for std::function
+    // R is the return type, Args is a parameter pack for argument types
+    template<typename R, typename... Args>
+    struct is_std_function<std::function<R(Args...)>> : std::true_type
+    {
+    };
+
+    // Helper variable template for convenience (C++14 onwards)
+    template<typename T>
+    constexpr bool is_std_function_v = is_std_function<T>::value;
+}
+
 namespace LLInitParam
 {
     // used to indicate no matching value to a given name when parsing
@@ -114,7 +135,7 @@ namespace LLInitParam
 
     // wraps comparison operator between any 2 values of the same type
     // specialize to handle cases where equality isn't defined well, or at all
-    template <typename T, bool IS_BOOST_FUNCTION = boost::is_convertible<T, boost::function_base>::value >
+    template <typename T, bool IS_BOOST_FUNCTION = std::is_constructible_v<T, boost::function_base> || ll::is_std_function_v<T>>
     struct ParamCompare
     {
         static bool equals(const T &a, const T &b)
@@ -123,7 +144,7 @@ namespace LLInitParam
         }
     };
 
-    // boost function types are not comparable
+    // boost and std function types are not comparable
     template<typename T>
     struct ParamCompare<T, true>
     {
@@ -474,7 +495,7 @@ namespace LLInitParam
 
         typedef bool (*parser_read_func_t)(Parser& parser, void* output);
         typedef bool (*parser_write_func_t)(Parser& parser, const void*, name_stack_t&);
-        typedef boost::function<void (name_stack_t&, S32, S32, const possible_values_t*)>   parser_inspect_func_t;
+        typedef std::function<void (name_stack_t&, S32, S32, const possible_values_t*)>   parser_inspect_func_t;
 
         typedef std::map<const std::type_info*, parser_read_func_t>     parser_read_func_map_t;
         typedef std::map<const std::type_info*, parser_write_func_t>    parser_write_func_map_t;
@@ -491,7 +512,7 @@ namespace LLInitParam
 
         virtual ~Parser();
 
-        template <typename T> bool readValue(T& param, typename boost::disable_if<boost::is_enum<T> >::type* dummy = 0)
+        template <typename T> bool readValue(T& param, typename std::enable_if_t<!std::is_enum_v<T>>* dummy = 0)
         {
             parser_read_func_map_t::iterator found_it = mParserReadFuncs->find(&typeid(T));
             if (found_it != mParserReadFuncs->end())
@@ -502,7 +523,7 @@ namespace LLInitParam
             return false;
         }
 
-        template <typename T> bool readValue(T& param, typename boost::enable_if<boost::is_enum<T> >::type* dummy = 0)
+        template <typename T> bool readValue(T& param, typename std::enable_if_t<std::is_enum_v<T> >* dummy = 0)
         {
             parser_read_func_map_t::iterator found_it = mParserReadFuncs->find(&typeid(T));
             if (found_it != mParserReadFuncs->end())
diff --git a/indra/llcommon/llleaplistener.h b/indra/llcommon/llleaplistener.h
index 9663e9a22f..f5587d1d68 100644
--- a/indra/llcommon/llleaplistener.h
+++ b/indra/llcommon/llleaplistener.h
@@ -13,9 +13,9 @@
 #define LL_LLLEAPLISTENER_H
 
 #include "lleventapi.h"
+#include <functional>
 #include <map>
 #include <string>
-#include <boost/function.hpp>
 
 /// Listener class implementing LLLeap query/control operations.
 /// See https://jira.lindenlab.com/jira/browse/DEV-31978.
@@ -30,7 +30,7 @@ public:
      * define the signature for a function that will perform that, and make
      * our constructor accept such a function.
      */
-    typedef boost::function<LLBoundListener(LLEventPump&, const std::string& listener)>
+    typedef std::function<LLBoundListener(LLEventPump&, const std::string& listener)>
             ConnectFunc;
     LLLeapListener(const ConnectFunc& connect);
     ~LLLeapListener();
diff --git a/indra/llcommon/llpounceable.h b/indra/llcommon/llpounceable.h
index da47abd8a0..e86098f20b 100644
--- a/indra/llcommon/llpounceable.h
+++ b/indra/llcommon/llpounceable.h
@@ -37,11 +37,12 @@
 
 #include "llsingleton.h"
 #include <boost/call_traits.hpp>
-#include <boost/type_traits/remove_pointer.hpp>
 #include <boost/utility/value_init.hpp>
 #include <boost/unordered_map.hpp>
 #include <boost/signals2/signal.hpp>
 
+#include <type_traits>
+
 // Forward declare the user template, since we want to be able to point to it
 // in some of its implementation classes.
 template <typename T, class TAG>
@@ -163,7 +164,7 @@ public:
 
     // make read access to mHeld as cheap and transparent as possible
     operator T () const { return mHeld; }
-    typename boost::remove_pointer<T>::type operator*() const { return *mHeld; }
+    typename std::remove_pointer<T>::type operator*() const { return *mHeld; }
     typename boost::call_traits<T>::value_type operator->() const { return mHeld; }
     // uncomment 'explicit' as soon as we allow C++11 compilation
     /*explicit*/ operator bool() const { return bool(mHeld); }
diff --git a/indra/llcommon/llptrto.cpp b/indra/llcommon/llptrto.cpp
index c4528a47a7..adf636c4d2 100644
--- a/indra/llcommon/llptrto.cpp
+++ b/indra/llcommon/llptrto.cpp
@@ -31,10 +31,9 @@
 // associated header
 #include "llptrto.h"
 // STL headers
+#include <type_traits>
 // std headers
 // external library headers
-#include <boost/type_traits/is_same.hpp>
-#include <boost/static_assert.hpp>
 // other Linden headers
 #include "llmemory.h"
 
@@ -76,27 +75,27 @@ public:
 int main(int argc, char *argv[])
 {
     // test LLPtrTo<>
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<RCFoo>::type, LLPointer<RCFoo> >::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<RCSubFoo>::type, LLPointer<RCSubFoo> >::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<TSRCFoo>::type, LLPointer<TSRCFoo> >::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<Bar>::type, Bar*>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<SubBar>::type, SubBar*>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLPtrTo<int>::type, int*>::value));
+    static_assert((std::is_same_v<LLPtrTo<RCFoo>::type, LLPointer<RCFoo> >));
+    static_assert((std::is_same_v<LLPtrTo<RCSubFoo>::type, LLPointer<RCSubFoo> >));
+    static_assert((std::is_same_v<LLPtrTo<TSRCFoo>::type, LLPointer<TSRCFoo> >));
+    static_assert((std::is_same_v<LLPtrTo<Bar>::type, Bar*>));
+    static_assert((std::is_same_v<LLPtrTo<SubBar>::type, SubBar*>));
+    static_assert((std::is_same_v<LLPtrTo<int>::type, int*>));
 
     // Test LLRemovePointer<>. Note that we remove both pointer variants from
     // each kind of type, regardless of whether the variant makes sense.
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<RCFoo*>::type, RCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<RCFoo> >::type, RCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<RCSubFoo*>::type, RCSubFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<RCSubFoo> >::type, RCSubFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<TSRCFoo*>::type, TSRCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<TSRCFoo> >::type, TSRCFoo>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<Bar*>::type, Bar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<Bar> >::type, Bar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<SubBar*>::type, SubBar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<SubBar> >::type, SubBar>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer<int*>::type, int>::value));
-    BOOST_STATIC_ASSERT((boost::is_same<LLRemovePointer< LLPointer<int> >::type, int>::value));
+    static_assert((std::is_same_v<LLRemovePointer<RCFoo*>::type, RCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<RCFoo> >::type, RCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer<RCSubFoo*>::type, RCSubFoo>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<RCSubFoo> >::type, RCSubFoo>));
+    static_assert((std::is_same_v<LLRemovePointer<TSRCFoo*>::type, TSRCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<TSRCFoo> >::type, TSRCFoo>));
+    static_assert((std::is_same_v<LLRemovePointer<Bar*>::type, Bar>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<Bar> >::type, Bar>));
+    static_assert((std::is_same_v<LLRemovePointer<SubBar*>::type, SubBar>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<SubBar> >::type, SubBar>));
+    static_assert((std::is_same_v<LLRemovePointer<int*>::type, int>));
+    static_assert((std::is_same_v<LLRemovePointer< LLPointer<int> >::type, int>));
 
     return 0;
 }
diff --git a/indra/llcommon/llptrto.h b/indra/llcommon/llptrto.h
index b57a1ee7f4..24e312559e 100644
--- a/indra/llcommon/llptrto.h
+++ b/indra/llcommon/llptrto.h
@@ -35,8 +35,6 @@
 #include "llrefcount.h"             // LLRefCount
 #include <boost/intrusive_ptr.hpp>
 #include <boost/shared_ptr.hpp>
-#include <boost/type_traits/is_base_of.hpp>
-#include <boost/type_traits/remove_pointer.hpp>
 #include <memory>                   // std::shared_ptr, std::unique_ptr
 #include <type_traits>
 
@@ -58,14 +56,14 @@ struct LLPtrTo
 
 /// specialize for subclasses of LLRefCount
 template <class T>
-struct LLPtrTo<T, typename std::enable_if< boost::is_base_of<LLRefCount, T>::value >::type>
+struct LLPtrTo<T, typename std::enable_if< std::is_base_of<LLRefCount, T>::value >::type>
 {
     typedef LLPointer<T> type;
 };
 
 /// specialize for subclasses of LLThreadSafeRefCount
 template <class T>
-struct LLPtrTo<T, typename std::enable_if< boost::is_base_of<LLThreadSafeRefCount, T>::value >::type>
+struct LLPtrTo<T, typename std::enable_if< std::is_base_of<LLThreadSafeRefCount, T>::value >::type>
 {
     typedef LLPointer<T> type;
 };
@@ -76,7 +74,7 @@ struct LLPtrTo<T, typename std::enable_if< boost::is_base_of<LLThreadSafeRefCoun
 template <typename PTRTYPE>
 struct LLRemovePointer
 {
-    typedef typename boost::remove_pointer<PTRTYPE>::type type;
+    typedef typename std::remove_pointer<PTRTYPE>::type type;
 };
 
 /// specialize for LLPointer<SOMECLASS>
diff --git a/indra/llcommon/llsdparam.cpp b/indra/llcommon/llsdparam.cpp
index 3ae153a67c..caaac3d762 100644
--- a/indra/llcommon/llsdparam.cpp
+++ b/indra/llcommon/llsdparam.cpp
@@ -30,7 +30,6 @@
 // Project includes
 #include "llsdparam.h"
 #include "llsdutil.h"
-#include "boost/bind.hpp"
 
 static  LLInitParam::Parser::parser_read_func_map_t sReadFuncs;
 static  LLInitParam::Parser::parser_write_func_map_t sWriteFuncs;
@@ -43,8 +42,6 @@ static const LLSD NO_VALUE_MARKER;
 LLParamSDParser::LLParamSDParser()
 : Parser(sReadFuncs, sWriteFuncs, sInspectFuncs)
 {
-    using boost::bind;
-
     if (sReadFuncs.empty())
     {
         registerParserFuncs<LLInitParam::Flag>(readFlag, &LLParamSDParser::writeFlag);
@@ -97,7 +94,7 @@ void LLParamSDParser::readSD(const LLSD& sd, LLInitParam::BaseBlock& block, bool
     mNameStack.clear();
     setParseSilently(silent);
 
-    LLParamSDParserUtilities::readSDValues(boost::bind(&LLParamSDParser::submit, this, boost::ref(block), _1, _2), sd, mNameStack);
+    LLParamSDParserUtilities::readSDValues(std::bind(&LLParamSDParser::submit, this, std::ref(block), std::placeholders::_1, std::placeholders::_2), sd, mNameStack);
     //readSDValues(sd, block);
 }
 
@@ -276,14 +273,14 @@ void LLParamSDParserUtilities::readSDValues(read_sd_cb_t cb, const LLSD& sd, LLI
     }
     else if (sd.isUndefined())
     {
-        if (!cb.empty())
+        if (cb != nullptr)
         {
             cb(NO_VALUE_MARKER, stack);
         }
     }
     else
     {
-        if (!cb.empty())
+        if (cb != nullptr)
         {
             cb(sd, stack);
         }
@@ -333,7 +330,7 @@ namespace LLInitParam
         if (!p.writeValue<LLSD>(mValue, name_stack_range))
         {
             // otherwise read from LLSD value and serialize out to parser (which could be LLSD, XUI, etc)
-            LLParamSDParserUtilities::readSDValues(boost::bind(&serializeElement, boost::ref(p), _1, _2), mValue, name_stack_range);
+            LLParamSDParserUtilities::readSDValues(std::bind(&serializeElement, std::ref(p), std::placeholders::_1, std::placeholders::_2), mValue, name_stack_range);
         }
         return true;
     }
diff --git a/indra/llcommon/llsdparam.h b/indra/llcommon/llsdparam.h
index 21ebb9a258..447ba02327 100644
--- a/indra/llcommon/llsdparam.h
+++ b/indra/llcommon/llsdparam.h
@@ -29,14 +29,14 @@
 #define LL_LLSDPARAM_H
 
 #include "llinitparam.h"
-#include "boost/function.hpp"
+#include <functional>
 #include "llfasttimer.h"
 
 struct LL_COMMON_API LLParamSDParserUtilities
 {
     static LLSD& getSDWriteNode(LLSD& input, LLInitParam::Parser::name_stack_range_t& name_stack_range);
 
-    typedef boost::function<void (const LLSD&, LLInitParam::Parser::name_stack_t&)> read_sd_cb_t;
+    typedef std::function<void (const LLSD&, LLInitParam::Parser::name_stack_t&)> read_sd_cb_t;
     static void readSDValues(read_sd_cb_t cb, const LLSD& sd, LLInitParam::Parser::name_stack_t& stack);
     static void readSDValues(read_sd_cb_t cb, const LLSD& sd);
 };
diff --git a/indra/llcommon/llsys.cpp b/indra/llcommon/llsys.cpp
index 270ca40086..803bab393c 100644
--- a/indra/llcommon/llsys.cpp
+++ b/indra/llcommon/llsys.cpp
@@ -51,9 +51,6 @@
 #include <boost/circular_buffer.hpp>
 #include <boost/lexical_cast.hpp>
 #include <boost/range.hpp>
-#include <boost/utility/enable_if.hpp>
-#include <boost/type_traits/is_integral.hpp>
-#include <boost/type_traits/is_float.hpp>
 #include "llfasttimer.h"
 
 using namespace llsd;
@@ -722,7 +719,7 @@ public:
     // Store every integer type as LLSD::Integer.
     template <class T>
     void add(const LLSD::String& name, const T& value,
-             typename boost::enable_if<boost::is_integral<T> >::type* = 0)
+             typename std::enable_if_t<std::is_integral_v<T> >* = 0)
     {
         mStats[name] = LLSD::Integer(value);
     }
@@ -730,7 +727,7 @@ public:
     // Store every floating-point type as LLSD::Real.
     template <class T>
     void add(const LLSD::String& name, const T& value,
-             typename boost::enable_if<boost::is_float<T> >::type* = 0)
+             typename std::enable_if_t<std::is_floating_point_v<T> >* = 0)
     {
         mStats[name] = LLSD::Real(value);
     }
diff --git a/indra/llcommon/lltreeiterators.h b/indra/llcommon/lltreeiterators.h
index cef501b987..cc13955d2f 100644
--- a/indra/llcommon/lltreeiterators.h
+++ b/indra/llcommon/lltreeiterators.h
@@ -60,10 +60,10 @@
 #define LL_LLTREEITERATORS_H
 
 #include "llptrto.h"
+#include <functional>
 #include <vector>
 #include <deque>
 #include <boost/iterator/iterator_facade.hpp>
-#include <boost/function.hpp>
 #include <boost/static_assert.hpp>
 
 namespace LLTreeIter
@@ -93,7 +93,7 @@ protected:
     typedef typename LLPtrTo<NODE>::type ptr_type;
     /// function that advances from this node to next accepts a node pointer
     /// and returns another
-    typedef boost::function<ptr_type(const ptr_type&)> func_type;
+    typedef std::function<ptr_type(const ptr_type&)> func_type;
     typedef SELFTYPE self_type;
 };
 
@@ -330,7 +330,7 @@ protected:
     typedef typename super::ptr_type ptr_type;
     // The func_type is different for this: from a NODE pointer, we must
     // obtain a CHILDITER.
-    typedef boost::function<CHILDITER(const ptr_type&)> func_type;
+    typedef std::function<CHILDITER(const ptr_type&)> func_type;
 private:
     typedef std::vector<ptr_type> list_type;
 public:
@@ -435,7 +435,7 @@ protected:
     typedef typename super::ptr_type ptr_type;
     // The func_type is different for this: from a NODE pointer, we must
     // obtain a CHILDITER.
-    typedef boost::function<CHILDITER(const ptr_type&)> func_type;
+    typedef std::function<CHILDITER(const ptr_type&)> func_type;
 private:
     // Upon reaching a given node in our pending list, we need to know whether
     // we've already pushed that node's children, so we must associate a bool
@@ -574,7 +574,7 @@ protected:
     typedef typename super::ptr_type ptr_type;
     // The func_type is different for this: from a NODE pointer, we must
     // obtain a CHILDITER.
-    typedef boost::function<CHILDITER(const ptr_type&)> func_type;
+    typedef std::function<CHILDITER(const ptr_type&)> func_type;
 private:
     // We need a FIFO queue rather than a LIFO stack. Use a deque rather than
     // a vector, since vector can't implement pop_front() efficiently.
diff --git a/indra/llcommon/tests/lleventdispatcher_test.cpp b/indra/llcommon/tests/lleventdispatcher_test.cpp
index 44f772e322..8b206f7b14 100644
--- a/indra/llcommon/tests/lleventdispatcher_test.cpp
+++ b/indra/llcommon/tests/lleventdispatcher_test.cpp
@@ -33,7 +33,6 @@
 #include <stdexcept>
 
 #include <boost/bind.hpp>
-#include <boost/function.hpp>
 #include <boost/range.hpp>
 
 #include <boost/lambda/lambda.hpp>
diff --git a/indra/llcommon/tests/llprocess_test.cpp b/indra/llcommon/tests/llprocess_test.cpp
index 4adfaf54f3..d3d8e54d45 100644
--- a/indra/llcommon/tests/llprocess_test.cpp
+++ b/indra/llcommon/tests/llprocess_test.cpp
@@ -21,7 +21,6 @@
 // external library headers
 #include "llapr.h"
 #include "apr_thread_proc.h"
-#include <boost/function.hpp>
 #include <boost/algorithm/string/find_iterator.hpp>
 #include <boost/algorithm/string/finder.hpp>
 // other Linden headers
@@ -264,9 +263,12 @@ static std::string python_out(const std::string& desc, const CONTENT& script)
 }
 
 /// Create a temporary directory and clean it up later.
-class NamedTempDir: public boost::noncopyable
+class NamedTempDir
 {
 public:
+    NamedTempDir(const NamedTempDir&) = delete;
+    NamedTempDir& operator=(const NamedTempDir&) = delete;
+
     NamedTempDir():
         mPath(NamedTempFile::temp_path()),
         mCreated(boost::filesystem::create_directories(mPath))
@@ -1095,8 +1097,11 @@ namespace tut
         ensure_equals("bad child exit code",   py.mPy->getStatus().mData,  0);
     }
 
-    struct EventListener: public boost::noncopyable
+    struct EventListener
     {
+        EventListener(const EventListener&) = delete;
+        EventListener& operator=(const EventListener&) = delete;
+
         EventListener(LLEventPump& pump)
         {
             mConnection =
diff --git a/indra/llcommon/tests/lltreeiterators_test.cpp b/indra/llcommon/tests/lltreeiterators_test.cpp
index 7a2adfd8ba..6734596d25 100644
--- a/indra/llcommon/tests/lltreeiterators_test.cpp
+++ b/indra/llcommon/tests/lltreeiterators_test.cpp
@@ -32,6 +32,7 @@
 
 // STL headers
 // std headers
+#include <functional>
 #include <iostream>
 #include <sstream>
 #include <string>
@@ -915,7 +916,7 @@ struct WalkExpected<LLTreeIter::BFS>: public Expected
 template <class NODE, typename CHILDITER>
 typename LLPtrTo<NODE>::type
 get_B2b(const typename LLPtrTo<NODE>::type& root,
-        const boost::function<CHILDITER(const typename LLPtrTo<NODE>::type&)>& child_begin)
+        const std::function<CHILDITER(const typename LLPtrTo<NODE>::type&)>& child_begin)
 {
     typedef typename LLPtrTo<NODE>::type NodePtr;
     CHILDITER Bi(child_begin(root));
-- 
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