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As a function parameter, an assignment expression or a `return` expression,
`ll_convert()` can infer its target type.
When it's important to specify the TOTYPE explicitly, rename the old
`ll_convert()` function template to `ll_convert_to()`. Fix existing usage.
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DRTVWR-543-maint_cmake
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Change projects to cmake targetsto get rid of havig to hardcore
include directories and link libraries in consumer projects.
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It's useful to be able to say STRINGIZE(item0 << item1 << item2), and we use
that a lot in our code base. But weird syntax aside, there are a couple
advantages to being able to write stringize(item0, item1, item2).
First, it allows stringize() to be used from within some other variadic
function, without having to make that function a macro that accepts an
arbitrary insertion-operator expression. There's no such thing as a member
macro.
Second, particularly for variadic functions, it allows us to optimize the
single-argument case stringize(item0). A macro can't do that. When item0 is
already a string of the desired char type, instead of streaming it into a
std::ostringstream and retrieving it again, we can simply return the input
string. When it's a pointer to the desired char type, we can directly
construct the result string without the help of std::ostringstream. When it's
a string of some other char type, we can engage ll_convert() to perform needed
conversions.
We generalize and optimize the generic gstringize() function, retaining the
role of stringize() and wstringize() as thin wrappers that merely provide the
desired char type.
Optimizing the single-argument case requires separately defining gstringize()
with two or more arguments: the general case. Then gstringize(arg) is
delegated to a gstringize_impl class template so we can partially specialize
to recognize a std::basic_string<desired_char_type> argument, as well as
desired_char_type*. Both these specializations engage ll_convert(), which
already handles the trivial case when no conversion is required.
Use of ll_convert() in this role supercedes and generalizes the previous
wstring_to_utf8str() and utf8str_to_wstring() overloads.
Also introduce stream_to(std::ostream&, ...) to support variadic streaming to
other destinations, e.g. a file, std::cout, ...
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In llpreprocessor.h, consider the case of clang on Windows: #define
LL_WCHAR_T_NATIVE there as well as for the Microsoft compiler with /Zc:wchar_t
switch.
In stdtypes.h, inject a LLWCHAR_IS_WCHAR_T symbol to allow the preprocessor to
make decisions about when the types are identical.
llstring.h's conversion logic deals with three types of wide strings
(LLWString, std::wstring and utf16string) based on three types of wide char
(llwchar, wchar_t and U16, respectively). Sometimes they're three distinct
types, sometimes wchar_t is identical to llwchar and sometimes wchar_t is
identical to U16. Rationalize the three cases using ll_convert_u16_alias() and
new ll_convert_wstr_alias() macros.
stringize.h was directly calling wstring_to_utf8str() and utf8str_to_wstring(),
which was producing errors with VS 2019 clang since there isn't actually a
wstring_to_utf8str(std::wstring) overload. Use ll_convert<std::string>()
instead, since that redirects to the relevant ll_convert_wide_to_string()
function. (And now you see why we've been trying to migrate to the uniform
ll_convert<target>() wrapper!) Similarly, call ll_convert<std::wstring>()
instead of a two-step conversion from utf8str_to_wstring(), producing LLWString,
then a character-by-character copy from LLWString to std::wstring. That
isn't even correct: on Windows, we should be encoding from UTF32 to UTF16.
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Streamline convenience overload stringize(std::wstring); make convenience
overload wstringize(std::string) symmetrically convert from UTF-8 string.
Also eliminate STRINGIZE() et al. dependency on Boost.Phoenix: use lambdas
instead.
Using lambdas instead of template expansion necessitates reordering some code
in wrapllerrs.h.
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For some reason, after the upgrade to Boost 1.57, gcc 4.6.3 has trouble with
the boost::lambda::_1 usage in stringize.h. This is consistent with other
cases we've encountered in which Boost.Lambda appears to be unmaintained and
losing its compatibility with other libraries. Fortunately Phoenix provides a
functional equivalent, albeit spelled differently.
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DEV-31978 viewer event host socket module.
reviewed by palmer+nat+mani.
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svn+ssh://svn.lindenlab.com/svn/linden/branches/event-system/event-system-7 svn+ssh://svn.lindenlab.com/svn/linden/branches/event-system/event-system-8
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