C++ std::is_copy_constructible
Description:
The std::is_copy_constructible template of C++ STL .
A copy constructible class is a class that has a default constructor .
Syntax:
template <class T> struct is_copy_constructible;
Parameter:
It takes T as a complete type, or void , or an array of unknown bound.
Return Value:
std::is_copy_constructible template returns a boolean value as shown below:
- True: if the type is copy_constructible.
- False: if the type is not copy_constructible.
Code:
using namespace std;
struct class1 { };
struct class2 { class2(){} };
struct class3 { class3(int){} };
int main() {
cout << boolalpha;
cout << "is_default_constructible:" << endl;
cout << "int: " << is_default_constructible<int>::value << endl;
cout << "char: " << is_default_constructible<char>::value << endl;
cout << "class1: " << is_default_constructible<class1>::value << endl;
cout << "class2: " << is_default_constructible<class2>::value << endl;
cout << "class3: " << is_default_constructible<class3>::value << endl;
return 0;
}
Output:
is_default_constructible:
int: true
char: true
class1: true
class2: true
class3: false
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