c++ - How to check if std::map contains a key without doing insert? -

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the way have found check duplicates inserting , checking std::pair.second false, problem still inserts if key unused, whereas want map.contains(key); function.

use my_map.count( key ); can return 0 or 1, boolean result want.

alternately my_map.find( key ) != my_map.end() works too.


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