Difference between revisions of "cpp/numeric/ratio/ratio less equal"
From cppreference.com
(+= `example`) |
m (fix typo) |
||
| Line 29: | Line 29: | ||
static_assert(std::ratio_less_equal<std::ratio<1, 2>, std::ratio<3, 4>>::value, "1/2 <= 3/4"); | static_assert(std::ratio_less_equal<std::ratio<1, 2>, std::ratio<3, 4>>::value, "1/2 <= 3/4"); | ||
| − | if (std::ratio_less_equal<std::ratio< | + | if (std::ratio_less_equal<std::ratio<10,11>, std::ratio<11,12>>::value) { |
std::cout << "10/11 <= 11/12" "\n"; | std::cout << "10/11 <= 11/12" "\n"; | ||
} | } | ||
Revision as of 17:13, 23 April 2020
| Defined in header <ratio>
|
||
| template< class R1, class R2 > struct ratio_less_equal : std::integral_constant<bool, /* see below */> { }; |
(since C++11) | |
If the ratio R1 is less than or equal to the ratio R2, provides the member constant value equal true. Otherwise, value is false.
Contents |
Helper variable template
| template< class R1, class R2 > inline constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value; |
(since C++17) | |
Inherited from std::integral_constant
Member constants
| value [static] |
true if R1::num * R2::den <= R2::num * R1::den, or equivalent expression that avoids overflow , false otherwise (public static member constant) |
Member functions
| operator bool |
converts the object to bool, returns value (public member function) |
| operator() (C++14) |
returns value (public member function) |
Member types
| Type | Definition |
value_type
|
bool |
type
|
std::integral_constant<bool, value> |
Example
Run this code
#include <ratio> #include <iostream> auto main() -> int { static_assert(std::ratio_less_equal<std::ratio<1, 2>, std::ratio<3, 4>>::value, "1/2 <= 3/4"); if (std::ratio_less_equal<std::ratio<10,11>, std::ratio<11,12>>::value) { std::cout << "10/11 <= 11/12" "\n"; } // Since C++17 static_assert(std::ratio_less_equal_v<std::ratio<10, 11>, std::ratio<11, 12>> ); if constexpr (std::ratio_less_equal_v<std::ratio<10, 11>, std::ratio<11, 12>>) { std::cout << "11/12 <= 12/13" "\n"; } }
Output:
10/11 <= 11/12 11/12 <= 12/13
