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#include <hash_map>
#include <time.h>
#include <iostream>
struct greater_str {
bool operator()(const std::string x, const std::string y) const {
if ( x.compare(y) > 0)
return true;
return false;
}
};
int main()
{
unsigned intmax = 1e07;
//declare maps
typedef stdext::hash_map<std::string, int, stdext::hash_compare<std::string, greater_str> > HashMap;
typedef std::map<std::string , int, greater_str > Map;
HashMap hmap;
Map map;
//add a lot of content
for(unsigned int i=0 ; i < intmax ; ++i)
{
srand (osg::Timer::instance()->tick());
//generate a string
std::string string(10,' ');
for(unsigned int j =0 ; j<9 ; ++j)
string[j] = (char)(rand() % 30 + 'a');
if(i == intmax*0.9)
string = "trouvemoi";
hmap.insert(std::make_pair(string, i));
map.insert(std::make_pair(string, i));
}
osg::Timer_t hstart = osg::Timer::instance()->tick();
Map::iterator it = map.find("trouvemoi");
double hres = osg::Timer::instance()->delta_u(hstart, osg::Timer::instance()->tick());
std::cout << "Hmap : " << hres << "µs, index " << it->second << std::endl;
osg::Timer_t mstart = osg::Timer::instance()->tick();
HashMap::iterator it2 = hmap.find("trouvemoi");
double mres = osg::Timer::instance()->delta_u(mstart, osg::Timer::instance()->tick());
std::cout << "map : " << mres << "µs, index " << it2->second << std::endl;
return 1;
} |
