table of contents
std::ratio_greater(3) | C++ Standard Libary | std::ratio_greater(3) |
NAME¶
std::ratio_greater - std::ratio_greater
Synopsis¶
Defined in header <ratio>
template< class R1, class R2 >
struct ratio_greater : std::integral_constant<bool, /* see below */>
(since C++11)
{ };
If the ratio R1 is greater than the ratio R2, provides the member constant
value
equal true. Otherwise, value is false.
Helper variable template
template< class R1, class R2 > (since C++17)
inline constexpr bool ratio_greater_v = ratio_greater<R1,
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_greater<std::ratio<3, 4>, std::ratio<1,
2>>::value,
"3/4 > 1/2");
if (std::ratio_greater<std::ratio<11, 12>, std::ratio<10,
11>>::value) {
std::cout << "11/12 > 10/11" "\n";
}
// Since C++17
static_assert(std::ratio_greater_v<std::ratio<12, 13>,
std::ratio<11, 12>> );
if constexpr (std::ratio_greater_v<std::ratio<12, 13>,
std::ratio<11, 12>>) {
std::cout << "12/13 > 11/12" "\n";
}
}
Output:¶
11/12 > 10/11
12/13 > 11/12
See also¶
2022.07.31 | http://cppreference.com |