std::less_equal<void>
From cppreference.com
| Defined in header <functional>
|
||
template<>
class less_equal<void>;
|
(since C++14) | |
std::less_equal<void> is a specialization of std::less_equal with parameter and return type deduced.
Nested types
| Nested type | Definition |
is_transparent
|
unspecified |
Member functions
tests if lhs compares less or equal than rhs (public member function) |
std::less_equal<void>::operator()
template< class T, class U >
constexpr auto operator()( T&& lhs, U&& rhs ) const
-> decltype(std::forward<T>(lhs) <= std::forward<U>(rhs));
|
||
Returns the result of std::forward<T>(lhs) <= std::forward<U>(rhs).
Parameters
| lhs, rhs | - | values to compare |
Return value
std::forward<T>(lhs) <= std::forward<U>(rhs).
If a built-in operator comparing pointers is called, the result is consistent with the implementation-defined strict total order over pointers.
Exceptions
May throw implementation-defined exceptions.
Example
Run this code
#include <algorithm>
#include <functional>
#include <initializer_list>
constexpr bool strictly_not_positive(int lhs)
{
return std::less_equal<>()(lhs, 0);
}
int main()
{
constexpr int low = 0, high = 8;
std::less_equal<> less_equal{};
static_assert(less_equal(low, high));
static_assert(less_equal(low, low));
static constexpr auto arr = {1, 0, -1, -2, -3, -4};
static_assert(!std::all_of(arr.begin(), arr.end(), strictly_not_positive));
static_assert(std::all_of(arr.begin() + 1, arr.end(), strictly_not_positive));
}
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.