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

If the ratio R1 is less than 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_v = ratio_less<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() { using x = std::ratio<69, 90>; using y = std::ratio<70, 90>;   if constexpr (std::ratio_less_v<x, y>) std::cout << x::num << '/' << x::den << " < " << y::num << '/' << y::den << '\n'; }

Output:

[edit] See also

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