std::deque<T,Allocator>::front
From cppreference.com
reference front(); |
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const_reference front() const; |
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Returns a reference to the first element in the container.
Calling front
on an empty container is undefined.
Parameters
(none)
Return value
reference to the first element
Complexity
Constant
Notes
For a container c
, the expression c.front() is equivalent to *c.begin().
Example
The following code uses front
to display the first element of a std::deque<char>:
Run this code
#include <deque> #include <iostream> int main() { std::deque<char> letters {'o', 'm', 'g', 'w', 't', 'f'}; if (!letters.empty()) { std::cout << "The first character is '" << letters.front() << "'.\n"; } }
Output:
The first character is 'o'.
See also
access the last element (public member function) |