本文详细解析了C++中不能被重载的六种函数声明情况：仅返回值类型不同的函数、静态成员函数之间的重载、指针与数组参数的等效、函数类型与指针类型的等效、const和volatile参数的等效、默认参数的等效。
In C++, following function declarations cannot be overloaded.
1) Function declarations that differ only in the return type.
函数声明仅返回值类型不同
2) Member function declarations with the same name and the name parameter-type-list cannot be overloaded if any of them is a static member function declaration.
3) Parameter declarations that differ only in a pointer * versus an array [] are equivalent.
4) Parameter declarations that differ only in that one is a function type and the other is a pointer to the same function type are equivalent.
5) Parameter declarations that differ only in the presence or absence of const and/or volatile are equivalent.
6) Two parameter declarations that differ only in their default arguments are equivalent.
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