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std::vector::front(3) C++ Standard Libary std::vector::front(3) NAME std::vector::front - std::vector::front Synopsis reference front(); (until C++20) constexpr reference front(); (since C++20) const_reference front() const; (until C++20) constexpr const_reference front() const; (since C++20) 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.be- gin(). Example The following code uses front to display the first element of a std::vector<char>: // Run this code #include <vector> #include <iostream> int main() { std::vector<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 back access the last element (public member function) http://cppreference.com 2022.07.31 std::vector::front(3)
NAME | Synopsis | Parameters | Return value | Complexity | Notes | Example | Output: | See also
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