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73 lines
1.6 KiB
C++
73 lines
1.6 KiB
C++
/**
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* @file libimp/fmt_cpo.h
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* @author mutouyun (orz@orzz.org)
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* @brief String formatting CPO.
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* @date 2022-11-28
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*/
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#pragma once
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#include <string>
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#include <array>
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#include <cstddef>
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#include "libimp/def.h"
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#include "libimp/generic.h"
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#include "libimp/detect_plat.h"
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#include "libimp/span.h"
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#include "libimp/export.h"
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LIBIMP_NAMESPACE_BEG_
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constexpr std::size_t fmt_context_aligned_size = 512U;
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/**
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* @brief The context of fmt.
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*/
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class LIBIMP_EXPORT fmt_context {
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std::array<char, fmt_context_aligned_size> sbuf_;
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std::string &joined_;
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std::size_t offset_;
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public:
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fmt_context(std::string &j) noexcept;
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std::size_t capacity() noexcept;
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void reset() noexcept;
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bool finish() noexcept;
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bool resize(std::size_t sz) noexcept;
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span<char> buffer() noexcept;
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bool expend(std::size_t sz) noexcept;
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bool append(std::string const &str) noexcept;
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};
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/**
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* @brief Supports custom fmt_to methods for imp::fmt.
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*/
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namespace detail {
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class fmt_to_t {
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template <typename A1>
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bool get_result(fmt_context &ctx, A1 && a1) const {
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return ::LIBIMP::tag_invoke(fmt_to_t{}, ctx, std::forward<A1>(a1));
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}
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template <typename A1, typename... A>
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bool get_result(fmt_context &ctx, A1 && a1, A &&...args) const {
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return get_result(ctx, std::forward<A1>(a1))
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&& get_result(ctx, std::forward<A>(args)...);
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}
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public:
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template <typename... A>
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bool operator()(fmt_context &ctx, A &&...args) const {
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return get_result(ctx, std::forward<A>(args)...);
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}
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};
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} // namespace detail
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constexpr detail::fmt_to_t fmt_to {};
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LIBIMP_NAMESPACE_END_
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