[calloc]

Compilation time is becoming less of an issue as well with compilers getting faster and faster. For example the same codebase using GCC 4.6 and clang 3.0, clang is almost 20% faster at compiling the same codebase.

Even so, making heavy use of templates I have not yet found any major issues or that compile time has increased so drastically that it became a concern for the project.

[ajax77]

Thankfully you're right; compilers have come a long way and Clang in particular has done a lot for easing the pains of template programming in a number of ways.

I'm knee deep in the development of several header-based, fully templated libraries, so I still certainly feel the pains of compilation times. And while the tests/samples I deal with tend to be somewhat extreme in their (ab)use of templates, I think you'll still find that the average Boost user would give a lot for yet speedier compilation.