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#include <iostream>
#include <inttypes.h>
 
class Test{
public:
 static const uint32_t Magic = 0x1123;
};
 
class DataStream{
public:
    template<typename T>
    DataStream& operator <<( const T& value )
    {
        std::cout << value << std::endl;
        return *this;
    }
};
 
int main()
{
    DataStream s;
 
    uint32_t a = Test::Magic;  // ok
    bool compare = ( a == Test::Magic ); // ok
    s << compare;
    s << a;
    s << Test::Magic;  // fail
 
    return 0;
}

/home/BpQ3HM/prog-331b5c.o: In function `main':
prog.cpp:(.text+0xc2): undefined reference to `Test::Magic'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Standard output is empty