| Defined in header <type_traits> | ||||
|---|---|---|---|---|
| (since C++11) |
If T is a compound type (that is, array, function, object pointer, function pointer, member object pointer, member function pointer, reference, class, union, or enumeration, including any cv-qualified variants), provides the member constant value equal true. For any other type, value is false.
Template parameters
| T | - | a type to check |
Helper variable template
| (since C++17) |
Inherited from std::integral_constant
Member constants
| value [static] | true if T is a compound 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
Compound types are the types that are constructed from fundamental types. Any C++ type is either fundamental or compound.
Possible implementation
|
Example
1 2 3 4 5 6 7 8 9 10 11 12 | #include <iostream>#include <type_traits> int main() { class cls {}; std::cout << (std::is_compound<cls>::value ? "T is compound" : "T is not a compound") << '\n'; std::cout << (std::is_compound<int>::value ? "T is compound" : "T is not a compound") << '\n';} |
Output:
1 2 | T is compoundT is not a compound |
See also
| (C++11) | checks if a type is fundamental type (class template) |
| (C++11) | checks if a type is scalar type (class template) |
| (C++11) | checks if a type is object type (class template) |
| (C++11) | checks if a type is an array type (class template) |
| std::experimental::is_compound_v
(library fundamentals TS) | variable template alias of std::is_compound::value (variable template) |
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