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#include <cstddef> //size_t
template<size_t SIZE>
class FixedString
{
public:
    operator const char*();
    void operator =(const char*);
 
    void operator =(const FixedString&);
 
    // Disallow
private:
    template<size_t OTHERSIZE>
    void operator=(const FixedString<OTHERSIZE>&);
};
 
int main()
{
    FixedString<10> buf1;
    FixedString<20> buf2;
 
    buf2 = buf1;   // NO ERROR!!
}

prog.cpp: In function ‘int main()’:
prog.cpp:14:10: error: ‘void FixedString<SIZE>::operator=(const FixedString<OTHERSIZE>&) [with unsigned int OTHERSIZE = 10u; unsigned int SIZE = 20u]’ is private
prog.cpp:22:12: error: within this context

Standard output is empty