标准库头文件 <charconv>
类 | |
| (C++17) |
指定 std::to_chars 和 std::from_chars 所用的格式 (枚举) |
函数 | |
| (C++17) |
转换字符序列到整数或浮点值 (函数) |
| (C++17) |
转换整数或浮点值到字符序列 (函数) |
概要
namespace std { // 初等数值转换的浮点格式 enum class chars_format { scientific = /* 未指明 */, fixed = /* 未指明 */, hex = /* 未指明 */, general = fixed | scientific }; // 初等数值输出转换 struct to_chars_result { char* ptr; errc ec; friend bool operator==(const to_chars_result&, const to_chars_result&) = default; }; to_chars_result to_chars(char* first, char* last, /* 见描述 */ value, int base = 10); to_chars_result to_chars(char* first, char* last, bool value, int base = 10) = delete; to_chars_result to_chars(char* first, char* last, float value); to_chars_result to_chars(char* first, char* last, double value); to_chars_result to_chars(char* first, char* last, long double value); to_chars_result to_chars(char* first, char* last, float value, chars_format fmt); to_chars_result to_chars(char* first, char* last, double value, chars_format fmt); to_chars_result to_chars(char* first, char* last, long double value, chars_format fmt); to_chars_result to_chars(char* first, char* last, float value, chars_format fmt, int precision); to_chars_result to_chars(char* first, char* last, double value, chars_format fmt, int precision); to_chars_result to_chars(char* first, char* last, long double value, chars_format fmt, int precision); // 初等数值输入转换 struct from_chars_result { const char* ptr; errc ec; friend bool operator==(const from_chars_result&, const from_chars_result&) = default; }; from_chars_result from_chars(const char* first, const char* last, /* 见描述 */& value, int base = 10); from_chars_result from_chars(const char* first, const char* last, float& value, chars_format fmt = chars_format::general); from_chars_result from_chars(const char* first, const char* last, double& value, chars_format fmt = chars_format::general); from_chars_result from_chars(const char* first, const char* last, long double& value, chars_format fmt = chars_format::general); }