has_nothrow_assign Class
Tests if type doesn't throw on assign.
template<class Ty>
struct has_nothrow_assign;
Parameters
- Ty
The type to query.
Remarks
An instance of the type predicate holds true if the type Ty has a nothrow copy assignment operator, otherwise it holds false.
A nothrow function is a function that has an empty throw specifier, or a function which the compiler can otherwise determine will not throw an exception.
Example
// std_tr1__type_traits__has_nothrow_assign.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
struct throws
{
throws() throw(int)
{
}
throws(const throws&) throw(int)
{
}
throws& operator=(const throws&) throw(int)
{
}
int val;
};
int main()
{
std::cout << "has_nothrow_assign<trivial> == " << std::boolalpha
<< std::tr1::has_nothrow_assign<trivial>::value << std::endl;
std::cout << "has_nothrow_assign<throws> == " << std::boolalpha
<< std::tr1::has_nothrow_assign<throws>::value << std::endl;
return (0);
}
has_nothrow_assign<trivial> == true has_nothrow_assign<throws> == false
Requirements
Header: <type_traits>
Namespace: std::tr1