How to find whether an element exists in std::map?

Question

My use case:

map cars;
bool exists(const string& name) {
  // somehow I should find whether my MAP has a car
  // with the name provid         


        

Answer 1

Sure, use an iterator

map<string,Car>::const_iterator it = cars.find(name);
return it!=cars.end();

Answer 2

This does not answer the question but it might be good to know. You can know if it exists by erasing it.

bool existed = cars.erase( name );

Answer 3

You could also use

bool exists(const string& name) {
  return cars.count(name) != 0;
} 

Answer 4

return cars.find(name) != cars.end();

Answer 5

C++20:

return cars.contains(name);