Just use const string ref as arg
I cannot tell any performance gain for using std::string_view as an argument of a function call insted of a const std::string&
Some runs are a plain draw, some would show a cold-cache advantage of one over the other that will dissapear on subsequent runs.
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Benchmark Time CPU Iterations items_per_second
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BM_arg(const std::string&) 2817 ns 2815 ns 247650 727.484M/s
BM_arg(std::string_view) 2822 ns 2822 ns 223897 725.773M/s
BM_arg<std::string> 2958 ns 2958 ns 223866 692.294M/s
BM_arg<std::string_view> 2955 ns 2955 ns 223965 693.055M/s
BM_arg<std::string> 2958 ns 2958 ns 223935 692.354M/s
BM_arg<std::string_view> 2955 ns 2955 ns 224019 693.024M/s
BM_arg<std::string> 2958 ns 2958 ns 224000 692.444M/s
BM_arg<std::string_view> 2957 ns 2957 ns 223942 692.578M/s
Written on November 5, 2024