Avoiding Name Conflicts

Namespaces allow different parts of a program to reuse the same short name safely.

avoiding_name_conflicts.cpp

#include <iostream>
#include <string>

namespace text_view {
std::string format(int value) {
    return "text:" + std::to_string(value);
}
}

namespace math_view {
std::string format(int value) {
    return "double:" + std::to_string(value * 2);
}
}

int main() {
    int value = ;

    std::string text = text_view::format(value);
    std::string math = math_view::format(value);

    std::cout << text << std::endl;
    std::cout << math << std::endl;
    return 0;
}

#include <iostream>
#include <string>

namespace text_view {
std::string format(int value) {
    return "text:" + std::to_string(value);
}
}

namespace math_view {
std::string format(int value) {
    return "double:" + std::to_string(value * 2);
}
}

int main() {
    int value = ;

    std::string text = text_view::format(value);
    std::string math = math_view::format(value);

    std::cout << text << std::endl;
    std::cout << math << std::endl;
    return 0;
}

#include <iostream>
#include <string>

namespace text_view {
std::string format(int value) {
    return "text:" + std::to_string(value);
}
}

namespace math_view {
std::string format(int value) {
    return "double:" + std::to_string(value * 2);
}
}

int main() {
    int value = ;

    std::string text = text_view::format(value);
    std::string math = math_view::format(value);

    std::cout << text << std::endl;
    std::cout << math << std::endl;
    return 0;
}

name conflict Two namespaces can each contain a function with the same name, and qualified names choose between them.