Материал из C\C++ эксперт
Demonstrates the use of using-declarations and using-directives.
#include <iostream>
void message()
{
std::cout << "Within function ::message()\n";
}
namespace A
{
using namespace std;
void message()
{
cout << "Within function A::message()\n";
}
}
namespace B
{
using std::cout;
void message(void);
}
void B::message(void)
{
cout << "Within function B::message()\n";
}
int main()
{
using namespace std;
using B::message;
cout << "Testing namespaces!\n";
cout << "\nCall of A::message()" << endl;
A::message();
cout << "\nCall of B::message()" << endl;
message();
cout << "\nCall of::message()" << endl;
::message();
return 0;
}
