std::is_compound Template in C++
The std::is_compound template of C++ STL is used to check the whether the type is a compound type or not. It returns a boolean value showing the same.
Syntax:
template < class T > struct is_compound;
Parameter: This template contains single parameter T (Trait class) to check whether T is a compound type or not.
Return Value: This template returns a boolean value as shown below:
- True: if the type is a compound type.
- False: if the type is a non-compound type.
Below programs illustrate the is_compound template in C++ STL:
Program 1:
// C++ program to illustrate // is_compound template #include <iostream> #include <type_traits> using namespace std; // main program struct GFG1 { }; union GFG2 { int var1; float var2; }; int main() { cout << boolalpha; cout << "is_compound:" << endl; cout << "GFG1: " << is_compound<GFG1>::value << endl; cout << "GFG2: " << is_compound<GFG2>::value << endl; cout << "int: " << is_compound< int >::value << endl; cout << "int*: " << is_compound< int *>::value << endl; return 0; } |
Output:
is_compound: GFG1: true GFG2: true int: false int*: true
Program 2:
// C++ program to illustrate // is_compound template #include <iostream> #include <type_traits> using namespace std; class GFG1 { }; enum class GFG2 { var1, var2, var3, var4 }; // main program int main() { cout << boolalpha; cout << "is_compound:" << endl; cout << "GFG1: " << is_compound<GFG1>::value << endl; cout << "GFG2: " << is_compound<GFG2>::value << endl; cout << "int[10]: " << is_compound< int [10]>::value << endl; cout << "int &: " << is_compound< int &>::value << endl; cout << "char: " << is_compound< char >::value << endl; return 0; } |
Output:
is_compound: GFG1: true GFG2: true int[10]: true int &: true char: false
Program 3:
// C++ program to illustrate // is_compound template #include <iostream> #include <type_traits> using namespace std; // driver code int main() { class gfg { }; cout << boolalpha; cout << "is_compound:" << endl; cout << "int(gfg::*): " << is_compound< int (gfg::*)>::value << endl; cout << "float: " << is_compound< float >::value << endl; cout << "double: " << is_compound< double >::value << endl; cout << "int(int): " << is_compound< int ( int )>::value << endl; return 0; } |
Output:
is_compound: int(gfg::*): true float: false double: false int(int): true
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