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how to see if a key in a map

For Beginners

Started by 3dcgmodeling April 23, 2007 03:56 AM

1 comment, last by Glak 16 years, 12 months ago

3dcgmodeling

100

Author

April 23, 2007 03:56 AM


map<char,int> m;
m['a'] = 10;
m['b'] = 20;
m['c'] = 30;

pair<map<char,int>::iterator,map<char,int>::iterator> p = m.equal_range('c');

if(p.first == m.end() && p.second == m.end())  // or if(p.first==p.second==m.end())
    report_key_is_not_in_map();

I do this way, it seem a little complex, more simple way?

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Morrandir

304

April 23, 2007 04:05 AM

map<char,int> m;m['a'] = 10;m['b'] = 20;m['c'] = 30;if (m.find('c') == m.end()){    report_key_is_not_in_map();}

How about this?

Glak

315

April 23, 2007 11:20 AM

my_map.count(key)

it returns the count as a number, which is implicitly converted to a bool

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how to see if a key in a map

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