C++ named requirements: BinaryTypeTrait (since C++11) (original) (raw)
A BinaryTypeTrait is a class template that describes a relationship between its two template type parameters with a std::integral_constant (typically std::bool_constant) specialization.
[edit] Requirements
- DefaultConstructible and CopyConstructible.
- Takes two template type parameters (additional template parameters are optional and allowed).
- Publicly and unambiguously derived from a specialization of std::integral_constant, known as its base characteristic.
- The member names of the base characteristic are not hidden and are unambiguously available.
[edit] Standard library
The following standard library class templates satisfy BinaryTypeTrait:
| is_same(C++11) | checks if two types are the same (class template) [edit] |
|---|---|
| is_base_of(C++11) | checks if a type is a base of the other type (class template) [edit] |
| is_virtual_base_of(C++26) | checks if a type is a virtual base of the other type (class template) [edit] |
| is_convertibleis_nothrow_convertible(C++11)(C++20) | checks if a type can be converted to the other type (class template) [edit] |
| is_layout_compatible(C++20) | checks if two types are layout-compatible (class template) [edit] |
| is_pointer_interconvertible_base_of(C++20) | checks if a type is a pointer-interconvertible (initial) base of another type (class template) [edit] |
| is_invocableis_invocable_ris_nothrow_invocableis_nothrow_invocable_r(C++17) | checks if a type can be invoked (as if by std::invoke) with the given argument types (class template) [edit] |
| uses_allocator(C++11) | checks if the specified type supports uses-allocator construction (class template) [edit] |