examples/all_features/namespace6.cpp

#include <doctest/doctest.h>

DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
#include <cstdint>
#include <sstream>
DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END

namespace user6 {
struct label
{
    label()
            : i(0) {}
    int         i;
    friend bool operator==(const user6::label& lhs, const user6::label& rhs) {
        return lhs.i == rhs.i;
    }
};
} // namespace user6

namespace user7 {
struct label
{
    label()
            : i(0) {}
    int         i;
    friend bool operator==(const user7::label& lhs, const user7::label& rhs) {
        return lhs.i == rhs.i;
    }
};
} // namespace user7

TEST_CASE("namespace 6 friend vs friend") {
    user6::label a6;
    user6::label b6;

    user7::label a7;
    user7::label b7;

    REQUIRE(a6 == b6);
    REQUIRE(a7 == b7);
}