Failed to compile with MSVC 17.8.3

[UMU618]

#include <boost/filesystem.hpp>

#include <fast_io.h>

will product error:

Build started at 16:18...
1>------ Build started: Project: fast_io_hello, Configuration: Release x64 ------
1>fast_io_hello.cpp
1>D:\github\microsoft\vcpkg\installed\x64-windows\include\fast_io_unit\string_impl\msvc_stl.h(20,8): error C2977: 'std::_String_iter_types': too many template arguments
1>(compiling source file 'fast_io_hello.cpp')
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.38.33130\include\xstring(2193,1):
1>see declaration of 'std::_String_iter_types'
1>D:\github\microsoft\vcpkg\installed\x64-windows\include\fast_io_unit\string_impl\msvc_stl.h(20,8):
1>the template instantiation context (the oldest one first) is
1>	D:\github\microsoft\vcpkg\installed\x64-windows\include\fast_io_unit\string_impl\msvc_stl.h(24,2):
1>	see reference to class template instantiation 'fast_io::details::string_hack::model<_Elem,_Traits,_Alloc>' being compiled
1>D:\github\microsoft\vcpkg\installed\x64-windows\include\fast_io_unit\string_impl\msvc_stl.h(20,8): error C3203: '_String_iter_types': unspecialized class template can't be used as a template argument for template parameter '_Ty2', expected a real type
1>(compiling source file 'fast_io_hello.cpp')
1>Done building project "fast_io_hello.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 16:18 and took 01.258 seconds ==========

Change the order of inclusion, will work:

#include <fast_io.h>

#include <boost/filesystem.hpp>

[UMU618]

Also conflicts with #include <filesystem>

[UMU618]

It seems MS has change the definition of _String_iter_types, since MSVC 17.8.3

From:

template <class _Value_type, class _Size_type, class _Difference_type, class _Pointer, class _Const_pointer,
    class _Reference, class _Const_reference>
struct _String_iter_types {
    using value_type      = _Value_type;
    using size_type       = _Size_type;
    using difference_type = _Difference_type;
    using pointer         = _Pointer;
    using const_pointer   = _Const_pointer;
};

To:

template <class _Value_type, class _Size_type, class _Difference_type, class _Pointer, class _Const_pointer>
struct _String_iter_types {
    using value_type      = _Value_type;
    using size_type       = _Size_type;
    using difference_type = _Difference_type;
    using pointer         = _Pointer;
    using const_pointer   = _Const_pointer;
};

[UMU618]

about 17.8.3:

_MSC_VER = 1938
_MSVC_STL_UPDATE = 202308
_MSVC_STL_VERSION = 143

[trcrsired]

vcpkg上的版本太老导致的。直接克隆include头文件就行了

[UMU618]

Already fixed there