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53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
#pragma once
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#include <cstdarg>
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#include <exception>
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#include <string>
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#include "Platform.h"
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#include "types.h"
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namespace fmt
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{
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std::string unsafe_format(const char* fmt...) noexcept;
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std::string unsafe_vformat(const char*, va_list) noexcept;
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// Formatting function
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template<typename... Args>
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inline std::string format(const char* fmt, const Args&... args)
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{
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return unsafe_format(fmt, ::unveil<Args>::get(args)...);
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}
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// Helper class
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class exception_base : public std::runtime_error
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{
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// Helper (there is no other room)
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va_list m_args;
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protected:
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// Internal formatting constructor
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exception_base(const char* fmt...);
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};
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// Exception type derived from std::runtime_error with formatting constructor
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class exception : public exception_base
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{
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public:
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template<typename... Args>
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exception(const char* fmt, const Args&... args)
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: exception_base(fmt, ::unveil<Args>::get(args)...)
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{
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}
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};
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// Narrow cast (similar to gsl::narrow) with exception message formatting
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template<typename To, typename From, typename... Args>
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inline auto narrow(const char* format_str, const From& value, const Args&... args) -> decltype(static_cast<To>(static_cast<From>(std::declval<To>())))
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{
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const auto result = static_cast<To>(value);
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if (static_cast<From>(result) != value) throw fmt::exception(format_str, value, args...);
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return result;
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}
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}
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