std::ratio_less_equal
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
.
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
#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
See also
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https://en.cppreference.com/w/cpp/numeric/ratio/ratio_less_equal