experiences of learning programming language

When I was writing macros, I wondered whether I can overload macros. According to my C++ knowledge, you can’t. But I still hope I can do so, so I give it a try:

When you are compiling a header full of template in different places and they share the same instantation parameters, you’ll waste a lot of time compiling them. Luckily, c++11 introduce “extern template” to solve this problem.

pointer to member functions

memory layout

The memory layout of member function pointers is actually a bit different from an ordinary pointer :

1. The size of it is twice as an ordinary function pointer.
2. And what it stores is quite different, too. When I store a normal member function in it, the first 8 bytes(a 64-bit machine) seems to be the address of that member function.
3. • When a virtual member function is stored in it, it actually holds 0x1, 0, which can’t be the address of the function.
   • So I guess that, the it might be stored as if it’s a member variable pointer, it holds the offset of it, not the absolute
   • address. I defined a derived class from it and overload the virtual function, and what the pointer of it holds 0x0, 0.

     The source file for testing the features above

When I was trying to write the following code:

related post: operator_specifier, not just a name, this post is about a question raised from it.

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