std::is_implicit_lifetime
Defined in header <type_traits> |
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(since C++23) |
std::is_implicit_lifetime is a 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
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(since C++23) |
Inherited from std::integral_constant
Member constants
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value
[static]
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true if T is an implicit-lifetime type, false otherwise (public static member constant) |
Member functions
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operator bool
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converts the object to bool, returns value (public member function) |
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operator()
(C++14)
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returns value (public member function) |
Member types
| Type | Definition |
|---|---|
value_type |
bool |
type |
std::integral_constant<bool, value> |
Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_is_implicit_lifetime |
202302L | (C++23) | std::is_implicit_lifetime |
Example
See also
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(C++11)
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checks if a type is a scalar type (class template) |
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(C++11)
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checks if a type is an array type (class template) |
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(C++17)
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checks if a type is an aggregate type (class template) |
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(C++23)
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implicitly creates objects in given storage with the object representation reused (function template) |
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