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| (since C++11) |
Returns an iterator to the first element of the container.
If the container is empty, the returned iterator will be equal to end().
Parameters
(none).
Return value
Iterator to the first element.
Exceptions
| (none) | (until C++11) |
noexcept specification: noexcept | (since C++11) |
Complexity
Constant.
Example
See also
| returns an iterator to the end (public member function) |
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #include <map>#include <string>#include <iostream>#include <iterator> int main() { std::map<std::string,std::string> a_map; a_map["Geely"] = "Chinese"; a_map["Peugeot"] = "French"; a_map["Mercedes"] = "German"; a_map["Toyota"] = "Japanese"; a_map["Ford"] = "American"; a_map["Fiat"] = "Italian"; for (auto it = a_map.cbegin(); it != std::next(a_map.cbegin(), 3); ++it) { std::cout << it->first << " : " << it->second << '\n'; }} |
Output:
1 2 3 | Fiat : ItalianFord : AmericanGeely : Chinese |
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