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#include <array>
#include <cstdint>
 
struct SessionKey {
    SessionKey(const std::array<uint8_t, 6> & inMAC, uint16_t inEtherType) :
        mMAC(inMAC),
        mEtherType(inEtherType)
    {
    }
 
    union {
        struct {
            std::array<uint8_t, 6> mMAC;
            uint16_t mEtherType;
        };
        uint64_t mValue;
    };
 
    friend bool operator==(const SessionKey & lhs, const SessionKey & rhs)
    { return lhs.mValue == rhs.mValue; }
 
    friend bool operator<(const SessionKey & lhs, const SessionKey & rhs)
    { return lhs.mValue < rhs.mValue; }
};
 
 
int main()
{
	std::map<SessionKey, int> test;
}

prog.cpp: In function 'int main()':
prog.cpp:29:2: error: 'map' is not a member of 'std'
prog.cpp:29:21: error: expected primary-expression before ',' token
prog.cpp:29:23: error: expected primary-expression before 'int'
prog.cpp:29:23: error: expected ';' before 'int'

Standard output is empty