namespace.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 31 行

#include <iostream>
#include <string>
using namespace std;

namespace NS {
    string data("NS namespace data");
}

string data("Global namespace data");

namespace NS {
    string data2("Additional NS namespace data");
}

int main()
{
    string data("Local data");
    cout << data << endl;

    cout << NS::data << endl;

    using namespace NS;
    cout << data << endl;           //overwritten by local data
    cout << data2 << endl;

    cout << ::data << endl;
    
    return 0;
}