43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
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#ifndef TOML11_VERSION_HPP
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#define TOML11_VERSION_HPP
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// This file checks C++ version.
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#ifndef __cplusplus
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# error "__cplusplus is not defined"
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#endif
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// Since MSVC does not define `__cplusplus` correctly unless you pass
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// `/Zc:__cplusplus` when compiling, the workaround macros are added.
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// Those enables you to define version manually or to use MSVC specific
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// version macro automatically.
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//
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// The value of `__cplusplus` macro is defined in the C++ standard spec, but
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// MSVC ignores the value, maybe because of backward compatibility. Instead,
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// MSVC defines _MSVC_LANG that has the same value as __cplusplus defined in
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// the C++ standard. First we check the manual version definition, and then
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// we check if _MSVC_LANG is defined. If neither, use normal `__cplusplus`.
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//
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// FYI: https://docs.microsoft.com/en-us/cpp/build/reference/zc-cplusplus?view=msvc-170
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// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-170
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//
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#if defined(TOML11_ENFORCE_CXX11)
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# define TOML11_CPLUSPLUS_STANDARD_VERSION 201103L
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#elif defined(TOML11_ENFORCE_CXX14)
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# define TOML11_CPLUSPLUS_STANDARD_VERSION 201402L
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#elif defined(TOML11_ENFORCE_CXX17)
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# define TOML11_CPLUSPLUS_STANDARD_VERSION 201703L
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#elif defined(TOML11_ENFORCE_CXX20)
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# define TOML11_CPLUSPLUS_STANDARD_VERSION 202002L
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#elif defined(_MSVC_LANG) && defined(_MSC_VER) && 1910 <= _MSC_VER
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# define TOML11_CPLUSPLUS_STANDARD_VERSION _MSVC_LANG
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#else
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# define TOML11_CPLUSPLUS_STANDARD_VERSION __cplusplus
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#endif
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#if TOML11_CPLUSPLUS_STANDARD_VERSION < 201103L && _MSC_VER < 1900
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# error "toml11 requires C++11 or later."
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#endif
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#endif// TOML11_VERSION_HPP
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