std::ratio_less_equal - cppreference.com (original) (raw)

| | | | | ---------------------------------------------------------------------------------------------------------------------------------------------------------- | | ------------- | | 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

• 1 Helper variable template
• 2 Inherited from std::integral_constant
  • 2.1 Member constants
  • 2.2 Member functions
  • 2.3 Member types
  • 2.4 Example
  • 2.5 See also

[edit] Helper variable template

| template< class R1, class R2 > constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value; | | (since C++17) | | ----------------------------------------------------------------------------------------------------------- | | ------------- |

Inherited from std::integral_constant

Member constants

| | true if R1::num * R2::den <= R2::num * R1::den, or equivalent expression that avoids overflow, false otherwise (public static member constant) | | --------------------------------------------------------------------------------------------------------------------------------------------------- |

Member functions

| | converts the object to bool, returns value (public member function) | | ---------------------------------------------------------------------- | | | returns value (public member function) |

Member types

[edit] Example

#include #include   int main() { 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";   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

[edit] See also

| | compares two ratio objects for equality at compile-time (class template) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | | compares two ratio objects for inequality at compile-time (class template) [edit] |