Why is there no std :: free overload for const void *?

Question

I use the extern C function, which returns dynamically allocated const char*.

I want to use unique_ptr<const char, decltype(std::free)>to manage it.

But there is no overload std::free(const void*), so I get invalid conversion from 'const void*' to 'void*'and should use const_cast<char*>().

Is this just a defect in the standard library or is there something else behind?

Answer 1

std::freeinherits from the standard C library. C has no overload, so the overload constcould not be inherited.

++ C , const ​​ free.

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, const_cast. .