cpp-polymorphism-shape2d_2/StringConcat.h at master · 0x81-sh/cpp-polymorphism-shape2d_2 · GitHub

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#pragma once
#include <string>

std::string operator+(const std::string &lhs, const std::string &rhs) {
    std::string s = lhs;
    s += rhs;
    return s;
}