Defined in header <type_traits> | ||
|---|---|---|
template< class T > struct is_implicit_lifetime; | (since C++23) |
If T is an implicit-lifetime type, provides the member constant value equal to true. For any other type, value is false.
The behavior is undefined if T is an incomplete type other than an array type or (possibly cv-qualified) void.
The behavior of a program that adds specializations for is_implicit_lifetime or is_implicit_lifetime_v is undefined.
| T | - | a type to check |
template< class T > inline constexpr bool is_implicit_lifetime_v = is_implicit_lifetime<T>::value; | (since C++23) |
| value
[static] | true if T is an implicit-lifetime type, false otherwise (public static member constant) |
| operator bool | converts the object to bool, returns value (public member function) |
| operator()
(C++14) | returns value (public member function) |
| Type | Definition |
|---|---|
value_type | bool |
type | std::integral_constant<bool, value> |
| Feature-test macro | Value | Std | Comment |
|---|---|---|---|
__cpp_lib_is_implicit_lifetime | 202302L | (C++23) |
std::is_implicit_lifetime |
|
(C++11) | checks if a type is a scalar type (class template) |
|
(C++11) | checks if a type is an array type (class template) |
|
(C++17) | checks if a type is an aggregate type (class template) |
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