NAME¶

std::ratio_less - std::ratio_less

Synopsis¶

Defined in header <ratio>
template< class R1, class R2 >
struct ratio_less : std::integral_constant<bool, /* see below */> { (since C++11)
};

If the ratio R1 is less than the ratio R2, provides the member constant value equal
true. Otherwise, value is false.

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 <iostream>
#include <ratio>

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:¶

23/30 < 7/9

See also¶

ratio_greater compares two ratio objects for greater than at compile-time
(C++11) (class template)