These two types are completely different. A better way to understand the
meaning of these types is:

T ==> int (foo::*)(foo obj, char c)
TC ==> int (foo::*)(const foo obj, char c)

Thus, it is not the member function pointer which is const or non-const. It
is actually an argument of the member function that differs in const-ness.
This cannot be done with a static_cast or a const_cast.

You can use a reinterpret_cast to do this.

T x = &foo::abc;
TC y = reinterpret_cast(x);

but be careful when using the result of reinterpret_cast.

Hope this helps,
Devdatt