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Compile time error in case of trying to use FMT_COMPILE while it's not supported is prettified

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Krylov Yaroslav 2020-12-12 03:27:34 +03:00
parent d88d078abe
commit 0484cd75ad
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GPG Key ID: 4C127DE932933076
1 changed files with 17 additions and 1 deletions
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18
include/fmt/compile.h
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@ -31,6 +31,22 @@ class compiled_string {};
template <typename S>
struct is_compiled_string : std::is_base_of<compiled_string, S> {};
#ifdef __cpp_if_constexpr
# define FMT_COMPILE_IMPL(s) FMT_STRING_IMPL(s, fmt::detail::compiled_string)
#else
namespace fmt_compile_error {
template<class T> struct false_type : std::false_type {};
template<class T> FMT_CONSTEXPR const char* report_compile_error() {
static_assert(
false_type<T>::value, "FMT_COMPILE requires C++17 `constexpr if` compiler support"
);
return "";
}
}
# define FMT_COMPILE_IMPL(s) ::fmt::detail::fmt_compile_error::report_compile_error<void*>()
#endif
/**
\rst
Converts a string literal *s* into a format string that will be parsed at
@ -44,7 +60,7 @@ struct is_compiled_string : std::is_base_of<compiled_string, S> {};
std::string s = fmt::format(FMT_COMPILE("{}"), 42);
\endrst
*/
#define FMT_COMPILE(s) FMT_STRING_IMPL(s, fmt::detail::compiled_string)
#define FMT_COMPILE(s) FMT_COMPILE_IMPL(s)
#if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS
template <typename Char, size_t N> struct fixed_string {