table of contents
std::ratio_greater_equal(3) | C++ Standard Libary | std::ratio_greater_equal(3) |
NAME¶
std::ratio_greater_equal - std::ratio_greater_equal
Synopsis¶
Defined in header <ratio>
template< class R1, class R2 >
struct ratio_greater_equal : std::integral_constant<bool, /* see (since
C++11)
below */> { };
If the ratio R1 is greater 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_greater_equal_v = ratio_greater_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_greater_equal<
std::ratio<2, 3>,
std::ratio<2, 3>>::value, "2/3 >= 2/3");
if (std::ratio_greater_equal<
std::ratio<2,1>, std::ratio<1, 2>>::value) {
std::cout << "2/1 >= 1/2" "\n";
}
if (std::ratio_greater_equal<
std::ratio<1,2>, std::ratio<1, 2>>::value) {
std::cout << "1/2 >= 1/2" "\n";
}
// Since C++17
static_assert(std::ratio_greater_equal_v<
std::ratio<999'999, 1'000'000>,
std::ratio<999'998, 999'999>> );
if constexpr (std::ratio_greater_equal_v<
std::ratio<999'999, 1'000'000>,
std::ratio<999'998, 999'999>>) {
std::cout << "999'999/1'000'000 >= 999'998/999'999"
"\n";
}
if constexpr (std::ratio_greater_equal_v<
std::ratio<999'999, 1'000'000>,
std::ratio<999'999, 1'000'000>>) {
std::cout << "999'999/1'000'000 >= 999'999/1'000'000"
"\n";
}
}
Output:¶
2/1 >= 1/2
1/2 >= 1/2
999'999/1'000'000 >= 999'998/999'999
999'999/1'000'000 >= 999'999/1'000'000
See also¶
2022.07.31 | http://cppreference.com |