The Curiously Recurring Template Pattern in C++

All C++ source code from: http://eli.thegreenplace.net/2011/05/17/the-curiously-recurring-template-pattern-in-c

Also contains benchmark for direct/indirect functional call overhead in Go in go_bench/

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Numbers:

• N=40000
• iMac (Retina 5K, 27-inch, Late 2014) - 3.5 GHz Intel Core i5
• best of 3 runs

C++ benchmarks

# no classes, just plain function call
time ./direct

counter=10665866680000

real    0m0.003s
user    0m0.001s
sys     0m0.001s

# call function through base class pointer, the CRTP way
time ./crtp

counter=10665866680000

real    0m0.003s
user    0m0.001s
sys     0m0.001s

# call function through base class pointer, typical dynamic dispatch
time ./dynamic

counter=10665866680000

real    0m1.284s
user    0m1.273s
sys     0m0.002s

Go benchmarks

# increment counter directly in a loop (no function calls)
time ./fncall_none

counter: 10665866680000

real    0m0.222s
user    0m0.213s
sys     0m0.003s

# call a function in a loop
time ./fncall_plain
counter: 10665866680000

real    0m0.227s
user    0m0.214s
sys     0m0.005s

# call a function (defined on a struct) in a loop
time ./fncall_on_struct

counter: 10665866680000

real    0m1.422s
user    0m1.413s
sys     0m0.004s

# call a function (defined on a struct) through an interface in a loop 
time ./fncall_on_interface

counter: 10665866680000

real    0m1.675s
user    0m1.664s
sys     0m0.004s