# std::is_implicit_lifetime

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< cpp‎ | types

Defined in header `<type_traits>` |  |
template< class T > struct is_implicit_lifetime; |  | (since C++23)

`std::is_implicit_lifetime` is an UnaryTypeTrait.

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 `std::is_implicit_lifetime` or `std::is_implicit_lifetime_v` is undefined.

### Template parameters

T | - | a type to check

### Helper variable template

template< class T > inline constexpr bool is_implicit_lifetime_v = is_implicit_lifetime<T>::value; |  | (since C++23)

## Inherited from std::integral_constant

### Member constants

value [static] | true if `T` is an implicit-lifetime type, false otherwise (public static member constant)

### Member functions

operator bool | converts the object to bool, returns value (public member function)
operator() (C++14) | returns value (public member function)

### Member types

Type | Definition
`value_type` | bool
`type` | std::integral_constant<bool, value>

### Notes

Feature-test macro | Value | Std | Comment
--- | --- | --- | ---
`__cpp_lib_is_implicit_lifetime` | 202302L | (C++23) | `std::is_implicit_lifetime`

### Example

| This section is incomplete Reason: example

### See also

is_scalar (C++11) | checks if a type is a scalar type (class template)
is_array (C++11) | checks if a type is an array type (class template)
is_aggregate (C++17) | checks if a type is an aggregate type (class template)

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