std::in_range
From cppreference.com
| Defined in header <utility>
|
||
| template< class R, class T > constexpr bool in_range( T t ) noexcept; |
(since C++20) | |
Returns true if the value of t is in the range of values that can be represented in R, that is, if t can be converted to R in a value-preserving manner.
It is a compile-time error if either T or U is a non-integer type, a character type, or bool.
Contents |
[edit] Parameters
| t | - | value to test |
[edit] Return value
true if the value of t is representable in R, false otherwise.
[edit] Possible implementation
template<class R, class T> constexpr bool in_range(T t) noexcept { return std::cmp_greater_equal(t, std::numeric_limits<R>::min()) && std::cmp_less_equal(t, std::numeric_limits<R>::max()); } |
[edit] Notes
This function cannot be used with enums (including std::byte), char, char8_t, char16_t, char32_t, wchar_t and bool.
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_integer_comparison_functions |
202002L |
(C++20) | Integer comparison functions |
[edit] Example
Run this code
#include <iostream> #include <utility> int main() { std::cout << std::boolalpha; std::cout << std::in_range<std::size_t>(-1) << '\n'; std::cout << std::in_range<std::size_t>(42) << '\n'; }
Output:
false true
[edit] See also
| (C++20) |
returns the smaller of the given values (algorithm function object) |
| (C++20) |
returns the greater of the given values (algorithm function object) |
| (C++20) |
clamps a value between a pair of boundary values (algorithm function object) |
| (C++20) |
linear interpolation function (function) |
