I don''t believe that every function defined within the class definition is implicitly inlined... anyway to the original poster: there''s probably not much point in inlining almost every function you use. Inline is intended to be a suggestion to the compiler that a certain (short) function should be expanded within the body of your program rather than called remotely. But it is only a suggestion, the compiler might ignore it, have other criteria for choosing what to inline, or even not be able to inline at all!

I would stick to inlining very short accessor methods (like the operator[] in an array class), and if you still can''t get the performance you need:
1. re-evaluate your code by hand
2. profile the program
3. rewrite the most expensive functions
4. try rewriting or inlining the most expensive parts of those functions