std::map::begin, std::map::cbegin
From cppreference.com
iterator begin(); |
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const_iterator begin() const; |
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const_iterator cbegin() const; |
(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().
Contents |
[edit] Parameters
(none)
[edit] Return value
Iterator to the first element
[edit] Exceptions
(none) | (until C++11) |
noexcept specification: noexcept |
(since C++11) |
[edit] Complexity
Constant
[edit] Example
This section is incomplete Reason: no example |
[edit] See also
returns an iterator to the end (public member function) |
[edit] Example
Run this code
#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:
Fiat : Italian Ford : American Geely : Chinese