in include/poac/util/stroite/core/builder.hpp [47:54]
bool is_cpp_file(const boost::filesystem::path& p) {
namespace fs = boost::filesystem;
return !fs::is_directory(p)
&& (p.extension().string() == ".cpp"
|| p.extension().string() == ".cxx"
|| p.extension().string() == ".cc"
|| p.extension().string() == ".cp");
}