C++ High Performance

The advantages of compile-time hash sum calculation

The problem which we will try to solve is that every time the line get_bitmap_resource("my_bitmap.png") is executed, the application will compute the hash sum of the string "my_bitmap.png" at runtime. What we would like to do is to perform this calculation already at compile time, so that when the application executes, the hash sum is already calculated. In other words, just as we have learned to use metaprogramming to generate functions and classes at compile time, we will now have it generate the hash sum at compile time.

One might come to the conclusion already that this is a so called micro-optimization: calculating the hash sum of a small string won't affect the application performance ...