Standard library header <charconv> (C++17)
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C++
Standard library headers
このヘッダは テキスト処理 ライブラリの一部です。
クラス |
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(C++17)
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std::to_chars
および
std::from_chars
の書式を指定する
(列挙型) |
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(C++17)
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std::from_chars
の戻り値型
(クラス) |
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(C++17)
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std::to_chars
の戻り値型
(クラス) |
関数 |
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(C++17)
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文字シーケンスを整数値または浮動小数点値に変換する
(関数) |
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(C++17)
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整数値または浮動小数点値を文字シーケンスに変換する
(関数) |
概要
namespace std { // 基本数値変換のための浮動小数点フォーマット enum class chars_format { scientific = /* unspecified */, fixed = /* unspecified */, hex = /* unspecified */, general = fixed | scientific }; // 基本数値出力変換 struct to_chars_result { // freestanding char* ptr; errc ec; friend bool operator==(const to_chars_result&, const to_chars_result&) = default; constexpr explicit operator bool() const noexcept { return ec == errc{}; } }; constexpr to_chars_result to_chars(char* first, char* last, // freestanding /* integer-type */ value, int base = 10); to_chars_result to_chars(char* first, char* last, // freestanding bool value, int base = 10) = delete; to_chars_result to_chars(char* first, char* last, // freestanding-deleted /* floating-point-type */ value); to_chars_result to_chars(char* first, char* last, // freestanding-deleted /* floating-point-type */ value, chars_format fmt); to_chars_result to_chars(char* first, char* last, // freestanding-deleted /* floating-point-type */ value, chars_format fmt, int precision); // 基本数値入力変換 struct from_chars_result { // freestanding const char* ptr; errc ec; friend bool operator==(const from_chars_result&, const from_chars_result&) = default; constexpr explicit operator bool() const noexcept { return ec == errc{}; } }; constexpr from_chars_result from_chars(const char* first, // freestanding const char* last, /* integer-type */& value, int base = 10); from_chars_result from_chars(const char* first, // freestanding-deleted const char* last, /* floating-point-type */& value, chars_format fmt = chars_format::general); }