Timings retrieved on Pentium4 3.2Ghz
g++ version: g++ (Debian 4.3.2-1.1) 4.3.2
flags: -O3 -march=native
boost: 1.37
| int to int | int to double | string to int | string to double | int to string | double to string | string to string | |
|
static_cast |
0.6ns | 1.4ns | - | - | - | - | 116ns |
| c functions | - | - | atoi 62ns |
atof 142ns |
sprintf** 383ns |
sprinf** |
204ns** |
| stringstream | 4163ns* | 4592ns* | 4128ns | 4649ns | 4555ns | 6186ns | 4067ns* |
| sprint::smart_cast |
0.7ns |
2.2ns |
123ns |
219ns |
256ns |
1546ns |
239ns |
| boost::lexical_cast | 1525ns | 1863ns | 1196ns | 1561ns | 627ns | 2931ns | 324ns |
* only for reference. Only a fool can used stringstream in those
cases!
** take care: sprintf can have buffer overrun fault
see Recents Benchmark Cast Boost
see: http://accu.org/index.php/journals/1375
see: [Tuning] Alexander Nasonov, Fine Tuning for lexical_cast, Overload #74, August 2006