all of, any of, none of

リスト・配列要素検査の関数all_of,any_of,none_ofは是非覚えておくとよい．

#include <vector>
#include <string>
#include <iostream>
#include <algorithm>

using namespace std;

bool chk(string s) {
 return s.size() > 5;
}

int main() {

 vector<string> v;
 v.push_back("Warsaw");
 v.push_back("NewYork");

 // all of
 cout << ( all_of(v.begin(),v.end(),chk) ? "[GOOD] all good" : "some failed or all failed" ) << endl;
 v.push_back("Tokyo");
 cout << ( all_of(v.begin(),v.end(),chk) ? "[GOOD] all good" : "some failed or all failed" ) << endl;

 v.clear();
 v.push_back("Rome");
 v.push_back("Nagoya");

 // any of
 cout << ( any_of(v.begin(),v.end(),chk) ? "[GOOD] some good" : "all failed" ) << endl;
 v.erase( find( v.begin(),v.end(),"Nagoya"));
 v.push_back("Osaka");
 cout << ( any_of(v.begin(),v.end(),chk) ? "[GOOD] some good" : "all failed" ) << endl;

 // none of
 cout << ( none_of(v.begin(),v.end(),chk) ? "[GOOD] all failed" : "not all failed" ) << endl;
 v.erase(find(v.begin(),v.end(),"Osaka"));
 v.push_back("Mangalore");
 cout << ( none_of(v.begin(),v.end(),chk) ? "[GOOD] all failed" : "not all failed" ) << endl;

 return 0;

}