Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Range (bits) integer_sort std::sort 1E7 elements
0 0.102 0.017
1 0.377 0.093
2 0.369 0.148
3 0.323 0.212
4 0.334 0.273
5 0.354 0.341
6 0.346 0.43
7 0.34 0.507
8 0.343 0.571
9 0.4 0.757
10 0.541 0.741
11 0.59 0.809
12 0.646 1.008
13 0.898 1.076
14 0.945 1.211
15 0.943 1.286
16 0.895 1.371
17 0.933 1.485
18 0.939 1.586
19 0.935 1.745
20 0.874 1.757
21 0.861 1.931
22 0.895 1.752
23 1.064 1.802
24 1.294 1.79
25 1.115 1.816
26 1.127 2.069
27 1.271 1.987
28 1.272 1.796
29 1.147 1.805
30 1.237 1.822
31 1.148 1.967
32 1.147 1.82