The C++ std deque begin function is used to obtain an iterator to the beginning of the deque. The deque, which is a double-ended queue, can be accessed from either end and a begin function is used to obtain an iterator to the first element.
Examples: 1. Using begin to output all the elements in a deque: ```c++ #include #include
int main() { std::deque my_deque = {1, 2, 3, 4, 5}; for (auto it = my_deque.begin(); it != my_deque.end(); ++it) { std::cout << *it << " "; } return 0; }
2. Using begin as a parameter for functions that take iterators:
c++
#include
#include
#include
int main() {
std::deque my_deque = {1, 2, 3, 4, 5};
std::reverse(my_deque.begin(), my_deque.end());
for (auto elem : my_deque) {
std::cout << elem << " ";
}
return 0;
}
```
The C++ std deque class and its member functions are part of the C++ Standard Library.
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