class template
<type_traits>
std::is_nothrow_copy_assignable
template <class T> struct is_nothrow_copy_assignable;
Is copy assignable throwing no exceptions
Template parameters
- T
- A complete type, or void (possible cv-qualified), or an array of unknown bound.
Member constants
Inherited from integral_constant:
| member constant | definition |
|---|
| value | either true or false |
Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
// is_nothrow_copy_assignable example
#include <iostream>
#include <type_traits>
struct A { };
struct B { B& operator= (const B&) {return *this;} };
struct C { C& operator= (const C&) noexcept {return *this;} };
int main() {
std::cout << std::boolalpha;
std::cout << "is_nothrow_copy_assignable:" << std::endl;
std::cout << "int: " << std::is_nothrow_copy_assignable<int>::value << std::endl;
std::cout << "A: " << std::is_nothrow_copy_assignable<A>::value << std::endl;
std::cout << "B: " << std::is_nothrow_copy_assignable<B>::value << std::endl;
std::cout << "C: " << std::is_nothrow_copy_assignable<C>::value << std::endl;
return 0;
}
| |
Output:
is_nothrow_copy_assignable:
int: true
A: true
B: false
C: true
|