C++Builder (Clang) vs Delphi - comparing std :: next_permutation implementations.
Reference : 1995 HP / SGI Implementation of the STL https://web.archive.org/web/20050403232242/http://www.sgi.com/tech/stl/ stl_algo.h
For length 12 sequence .. 'abcdefghijkl'
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c++ : ~= 2 sec
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delphi : initially 10 sec (this code) .. eventually 4 sec