Linux包含hash_地图和hash_set的not declared有关问题
Linux包含hash_map和hash_set的not declared问题
当在Linux下cpp文件包含hash_map或hash_set时,会出现"‘hash_map’ was not declared in this scope"问题。
#include <iostream> #include <string> #include <hash_map> using namespace std; int main(void) { hash_map<int, string> hmap; hmap[1] = "hi hdu1"; hmap[2] = "hi hdu2"; hmap[3] = "hi hdu3"; hash_map<int, string>::iterator iter; iter = hmap.find(2); if (iter != hmap.end()) { cout << iter->second << endl; } else { cout << "not find" << endl; } return 0; }
#include <iostream> #include <string> #include <hash_map> using namespace std; using namespace __gnu_cxx; int main(void) { hash_map<int, string> hmap; hmap[1] = "hi hdu1"; hmap[2] = "hi hdu2"; hmap[3] = "hi hdu3"; hash_map<int, string>::iterator iter; iter = hmap.find(2); if (iter != hmap.end()) { cout << iter->second << endl; } else { cout << "not find" << endl; } return 0; }
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