NAME¶

std::ratio_less_equal - std::ratio_less_equal

Synopsis¶

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, (since C++17)
R2>::value;

Inherited from std::integral_constant

Member constants¶

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

Member functions¶

operator bool converts the object to bool, returns value
(public member function)
operator() returns value
(C++14) (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

See also¶