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96 lines
3.6 KiB
C++
96 lines
3.6 KiB
C++
/**
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* @file libimp/fmt.h
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* @author mutouyun (orz@orzz.org)
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* @brief String formatting.
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* @date 2022-11-26
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*/
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#pragma once
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#include <string>
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#include <utility>
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#include <type_traits>
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#include <chrono> // std::chrono::time_point
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#include <cstddef>
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#include <ctime> // std::tm
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#include "libimp/def.h"
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#include "libimp/span.h"
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#include "libimp/detect_plat.h"
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#include "libimp/export.h"
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LIBIMP_NAMESPACE_BEG_
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template <typename T>
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struct fmt_ref {
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span<char const> fstr;
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T param;
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};
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template <std::size_t N>
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auto spec(char const (&fstr)[N]) noexcept {
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return [&fstr](auto &&arg) noexcept {
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using arg_t = decltype(arg);
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return fmt_ref<arg_t> {{fstr}, static_cast<arg_t>(arg)};
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};
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}
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template <typename... A>
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std::string fmt(A &&...args) {
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std::string joined;
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LIBIMP_UNUSED auto unfold = {
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joined.append(to_string(std::forward<A>(args)))...
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};
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return joined;
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}
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/// @brief Return the string directly.
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LIBIMP_EXPORT std::string const &to_string(std::string const &a) noexcept;
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LIBIMP_EXPORT std::string to_string(std::string const &a, span<char const> fstr) noexcept;
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/// @brief Character to string conversion.
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/// @return an empty string if the conversion fails
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LIBIMP_EXPORT std::string to_string(char a) noexcept;
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LIBIMP_EXPORT std::string to_string(wchar_t a) noexcept;
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LIBIMP_EXPORT std::string to_string(char16_t a) noexcept;
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LIBIMP_EXPORT std::string to_string(char32_t a) noexcept;
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#if defined(LIBIMP_CPP_20)
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LIBIMP_EXPORT std::string to_string(char8_t a) noexcept;
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#endif // defined(LIBIMP_CPP_20)
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/// @brief Conversion of numeric types to strings.
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/// @return an empty string if the conversion fails
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LIBIMP_EXPORT std::string to_string(signed char a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(unsigned char a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(signed short a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(unsigned short a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(signed int a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(unsigned int a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(signed long a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(unsigned long a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(signed long long a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(unsigned long long a, span<char const> fstr = {}) noexcept;
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/// @brief Conversion of floating point type to strings.
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/// @return an empty string if the conversion fails
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LIBIMP_EXPORT std::string to_string(float a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(double a, span<char const> fstr = {}) noexcept;
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LIBIMP_EXPORT std::string to_string(long double a, span<char const> fstr = {}) noexcept;
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/// @brief Pointer.
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LIBIMP_EXPORT std::string to_string(std::nullptr_t) noexcept;
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template <typename T,
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typename = std::enable_if_t<std::is_same<T, void>::value>>
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LIBIMP_EXPORT std::string to_string(T *a) noexcept;
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/// @brief Date and time.
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LIBIMP_EXPORT std::string to_string(std::tm const &a, span<char const> fstr = {}) noexcept;
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namespace detail {
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LIBIMP_EXPORT std::string time_to_string(std::time_t tt, span<char const> fstr) noexcept;
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} // namespace detail
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template <class Clock, class Duration>
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LIBIMP_EXPORT std::string to_string(std::chrono::time_point<Clock, Duration> const &a, span<char const> fstr = {}) noexcept {
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return detail::time_to_string(std::chrono::system_clock::to_time_t(a), fstr);
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}
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LIBIMP_NAMESPACE_END_
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