标准库标头 <ratio>
来自cppreference.com
此头文件是编译时有理数算术库的一部分。
类 | ||
| (C++11) |
表示精确的有理分数 (类模板) | |
算术 | ||
| (C++11) |
在编译时相加两个 ratio 对象 (别名模板) | |
| (C++11) |
在编译时相减两个 ratio 对象 (别名模板) | |
| (C++11) |
在编译时相乘两个 ratio 对象 (别名模板) | |
| (C++11) |
在编译时相除两个 ratio 对象 (别名模板) | |
比较 | ||
| (C++11) |
在编译时比较两个 ratio 对象的相等性 (类模板) | |
| (C++11) |
在编译时比较两个 ratio 对象的不相等性 (类模板) | |
| (C++11) |
在编译时比较两个 ratio 对象的小于关系 (类模板) | |
| (C++11) |
在编译时比较两个 ratio 对象的小于或等于关系 (类模板) | |
| (C++11) |
在编译时比较两个 ratio 对象的大于关系 (类模板) | |
| (C++11) |
在编译时比较两个 ratio 对象的大于或等于关系 (类模板) | |
类型别名 | |
quecto (C++26)
|
std::ratio<1, 1000000000000000000000000000000>，若 std::intmax_t 能表示分母 |
ronto (C++26)
|
std::ratio<1, 1000000000000000000000000000>，若 std::intmax_t 能表示分母 |
yocto
|
std::ratio<1, 1000000000000000000000000>，若 std::intmax_t 能表示分母 |
zepto
|
std::ratio<1, 1000000000000000000000>，若 std::intmax_t 能表示分母 |
atto
|
std::ratio<1, 1000000000000000000> |
femto
|
std::ratio<1, 1000000000000000> |
pico
|
std::ratio<1, 1000000000000> |
nano
|
std::ratio<1, 1000000000> |
micro
|
std::ratio<1, 1000000> |
milli
|
std::ratio<1, 1000> |
centi
|
std::ratio<1, 100> |
deci
|
std::ratio<1, 10> |
deca
|
std::ratio<10, 1> |
hecto
|
std::ratio<100, 1> |
kilo
|
std::ratio<1000, 1> |
mega
|
std::ratio<1000000, 1> |
giga
|
std::ratio<1000000000, 1> |
tera
|
std::ratio<1000000000000, 1> |
peta
|
std::ratio<1000000000000000, 1> |
exa
|
std::ratio<1000000000000000000, 1> |
zetta
|
std::ratio<1000000000000000000000, 1>，若 std::intmax_t 能表示分子 |
yotta
|
std::ratio<1000000000000000000000000, 1>，若 std::intmax_t 能表示分子 |
ronna (C++26)
|
std::ratio<1000000000000000000000000000, 1>，若 std::intmax_t 能表示分子 |
quetta (C++26)
|
std::ratio<1000000000000000000000000000000, 1>，若 std::intmax_t 能表示分子 |
[编辑] 概要
namespace std { // 类模板 ratio template <intmax_t N, intmax_t D = 1> class ratio { public: typedef ratio<num, den> type; static constexpr intmax_t num; static constexpr intmax_t den; }; // ratio 算术 template <class R1, class R2> using ratio_add = /*ratio*/; template <class R1, class R2> using ratio_subtract = /*ratio*/; template <class R1, class R2> using ratio_multiply = /*ratio*/; template <class R1, class R2> using ratio_divide = /*ratio*/; // ratio 比较 template <class R1, class R2> struct ratio_equal; template <class R1, class R2> struct ratio_not_equal; template <class R1, class R2> struct ratio_less; template <class R1, class R2> struct ratio_less_equal; template <class R1, class R2> struct ratio_greater; template <class R1, class R2> struct ratio_greater_equal; // 便利 SI typedef typedef ratio<1, 1000000000000000000000000000000> quecto; typedef ratio<1, 1000000000000000000000000000> ronto; typedef ratio<1, 1000000000000000000000000> yocto; typedef ratio<1, 1000000000000000000000> zepto; typedef ratio<1, 1000000000000000000> atto; typedef ratio<1, 1000000000000000> femto; typedef ratio<1, 1000000000000> pico; typedef ratio<1, 1000000000> nano; typedef ratio<1, 1000000> micro; typedef ratio<1, 1000> milli; typedef ratio<1, 100> centi; typedef ratio<1, 10> deci; typedef ratio< 10, 1> deca; typedef ratio< 100, 1> hecto; typedef ratio< 1000, 1> kilo; typedef ratio< 1000000, 1> mega; typedef ratio< 1000000000, 1> giga; typedef ratio< 1000000000000, 1> tera; typedef ratio< 1000000000000000, 1> peta; typedef ratio< 1000000000000000000, 1> exa; typedef ratio< 1000000000000000000000, 1> zetta; typedef ratio< 1000000000000000000000000, 1> yotta; typedef ratio< 1000000000000000000000000000, 1> ronna; typedef ratio<1000000000000000000000000000000, 1> quetta; }
