E X C E P T I O N A L

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But there is error generated here???????

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http://en.cppreference.com/w/cpp/language/operator_other#Built-in_function_call_operator

>http://en.cppreference.com/w/cpp/language/operator_other#Built-in_function_call_operator

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Z E R O R E P L I E S

>>57760721
what if T is a string type?

>>57760721

because operator string() and string operator()() are redundant ways of defining the same operator - you're defining it twice, which is what the error is trying to tell your retarded ass.