Benchmark for various C++ function implementations.
Currently include:
- stdex::function - A multi-signature function implementation authored by me :)
- multifunction - Example from Boost.TypeErasure, another multi-signature function.
- std::function - Standard.
- boost::function - The one from Boost.
- func::function - From this blog.
- generic::delegate - Fast delegate in C++11, also see here.
ssvu::FastFunc- Another Don Clugston's FastDelegate, as shown here.- cxx_function::function - By David Krauss
- fu2::function - By Denis Blank
- fixed_size_function - By Pavel Medvedev
Compiled with g++ -O3 -std=c++14 -DNDEBUG (64-bit/g++5.3.0/MinGW)
The size of each implementation is shown in the [size] section.
Keep in mind that bigger size does not necessarily mean that it's less space efficient, it may due to the decision on how much space is reserved for small object optimization.
Other sections show the timing of function invocation for each implementation when assigned different callable objects.
[size]
stdex::function<int(int)>: 24
std::function<int(int)>: 32
cxx_function::function<int(int)>: 32
multifunction<int(int)>: 32
boost::function<int(int)>: 32
func::function<int(int)>: 32
generic::delegate<int(int)>: 56
ssvu::FastFunc<int(int)>: 40
fu2::function<int(int)>: 48
fixed_size_function<int(int)>: 128
[function_pointer]
Perf< no_abstraction >: 0.3097261791 [s] {checksum: 0}
Perf< stdex::function<int(int)> >: 0.3481479514 [s] {checksum: 0}
Perf< std::function<int(int)> >: 0.4749179120 [s] {checksum: 0}
Perf< cxx_function::function<int(int)> >: 0.3596407551 [s] {checksum: 0}
Perf< multifunction<int(int)> >: 0.4085937307 [s] {checksum: 0}
Perf< boost::function<int(int)> >: 0.3796730815 [s] {checksum: 0}
Perf< func::function<int(int)> >: 0.4384196603 [s] {checksum: 0}
Perf< generic::delegate<int(int)> >: 0.4661153492 [s] {checksum: 0}
Perf< fu2::function<int(int)> >: 0.4108554915 [s] {checksum: 0}
Perf< fixed_size_function<int(int)> >: 0.4526590249 [s] {checksum: 0}
[compile_time_function_pointer]
Perf< no_abstraction >: 0.0808029059 [s] {checksum: 0}
Perf< stdex::function<int(int)> >: 0.2908244131 [s] {checksum: 0}
Perf< std::function<int(int)> >: 0.3351834673 [s] {checksum: 0}
Perf< cxx_function::function<int(int)> >: 0.3552733937 [s] {checksum: 0}
Perf< multifunction<int(int)> >: 0.3171137015 [s] {checksum: 0}
Perf< boost::function<int(int)> >: 0.3285364251 [s] {checksum: 0}
Perf< func::function<int(int)> >: 0.3148621808 [s] {checksum: 0}
Perf< generic::delegate<int(int)> >: 0.3863633236 [s] {checksum: 0}
Perf< fu2::function<int(int)> >: 0.3963418868 [s] {checksum: 0}
Perf< fixed_size_function<int(int)> >: 0.4241716557 [s] {checksum: 0}
[compile_time_delegate]
Perf< no_abstraction >: 0.2200538304 [s] {checksum: 0}
Perf< stdex::function<int(int)> >: 0.3107501794 [s] {checksum: 0}
Perf< std::function<int(int)> >: 0.3433393099 [s] {checksum: 0}
Perf< cxx_function::function<int(int)> >: 0.4407835011 [s] {checksum: 0}
Perf< multifunction<int(int)> >: 0.4477111833 [s] {checksum: 0}
Perf< boost::function<int(int)> >: 0.4012967684 [s] {checksum: 0}
Perf< func::function<int(int)> >: 0.3358036275 [s] {checksum: 0}
Perf< generic::delegate<int(int)> >: 0.4259671763 [s] {checksum: 0}
Perf< fu2::function<int(int)> >: 0.4842375950 [s] {checksum: 0}
Perf< fixed_size_function<int(int)> >: 0.5439505741 [s] {checksum: 0}
[lambda]
Perf< stdex::function<int(int)> >: 0.2879140121 [s] {checksum: 0}
Perf< std::function<int(int)> >: 0.3474465112 [s] {checksum: 0}
Perf< cxx_function::function<int(int)> >: 0.3415665093 [s] {checksum: 0}
Perf< multifunction<int(int)> >: 0.3167393014 [s] {checksum: 0}
Perf< boost::function<int(int)> >: 0.3431556298 [s] {checksum: 0}
Perf< func::function<int(int)> >: 0.3105994594 [s] {checksum: 0}
Perf< generic::delegate<int(int)> >: 0.3951735665 [s] {checksum: 0}
Perf< fu2::function<int(int)> >: 0.4066385301 [s] {checksum: 0}
Perf< fixed_size_function<int(int)> >: 0.4255831762 [s] {checksum: 0}
[lambda_capture]
Perf< stdex::function<int(int)> >: 0.2971885751 [s] {checksum: 0}
Perf< std::function<int(int)> >: 0.3859566035 [s] {checksum: 0}
Perf< cxx_function::function<int(int)> >: 0.3332081066 [s] {checksum: 0}
Perf< multifunction<int(int)> >: 0.4276551768 [s] {checksum: 0}
Perf< boost::function<int(int)> >: 0.3382449082 [s] {checksum: 0}
Perf< func::function<int(int)> >: 0.3208087427 [s] {checksum: 0}
Perf< generic::delegate<int(int)> >: 0.4915601573 [s] {checksum: 0}
Perf< fu2::function<int(int)> >: 0.4220785351 [s] {checksum: 0}
Perf< fixed_size_function<int(int)> >: 0.4740663917 [s] {checksum: 0}
[heavy_functor]
Perf< stdex::function<int(int)> >: 0.3288033052 [s] {checksum: 0}
Perf< std::function<int(int)> >: 0.3807524418 [s] {checksum: 0}
Perf< cxx_function::function<int(int)> >: 0.3348333871 [s] {checksum: 0}
Perf< multifunction<int(int)> >: 0.3301335456 [s] {checksum: 0}
Perf< boost::function<int(int)> >: 0.3301117856 [s] {checksum: 0}
Perf< func::function<int(int)> >: 0.3194522622 [s] {checksum: 0}
Perf< generic::delegate<int(int)> >: 0.3797671615 [s] {checksum: 0}
Perf< fu2::function<int(int)> >: 0.4055642898 [s] {checksum: 0}
Perf< fixed_size_function<int(int)> >: 0.4199678144 [s] {checksum: 0}
[non_assignable]
Perf< stdex::function<int(int)> >: 0.3443457102 [s] {checksum: 0}
Perf< std::function<int(int)> >: 0.3453594705 [s] {checksum: 0}
Perf< cxx_function::function<int(int)> >: 0.4353002993 [s] {checksum: 0}
Perf< multifunction<int(int)> >: 0.4613886276 [s] {checksum: 0}
Perf< boost::function<int(int)> >: 0.4041297293 [s] {checksum: 0}
Perf< func::function<int(int)> >: 0.3529303529 [s] {checksum: 0}
Perf< generic::delegate<int(int)> >: 0.5186436860 [s] {checksum: 0}
Perf< fu2::function<int(int)> >: 0.4996455999 [s] {checksum: 0}
Perf< fixed_size_function<int(int)> >: 0.5608420995 [s] {checksum: 0}
This shows the timing of each multi-method technique.
with< no_abstraction >: 0.0712217144 [s] {checksum: 3}
with< stdex::function<Sig...> >: 0.5929125805 [s] {checksum: 3}
with< multifunction<Sig...> >: 0.7295508931 [s] {checksum: 3}
with< cxx_function::function<Sig...> >: 0.7109221050 [s] {checksum: 3}
with< virtual_base& >: 0.4269222868 [s] {checksum: 3}