The following code uses front to access the first element of a std::vector<char>:

The following code uses front to access the first element of a std::array<char, 4>:

Defect reports The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

1) std::vector is a sequence container that encapsulates dynamic size arrays.

Return value A reference to the first element. Complexity Constant. Notes For a span c, the expression c.front() is equivalent to *c.begin(). Example

C++ reference C++

The default implementation of front() member function returns the first element in the view of the derived type. Whether the element is returned by value or by reference depends on the operator* of the …

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Notes For a container c, the expression c.front() is equivalent to *c.begin().

namespace std { template<class Allocator> class vector<bool, Allocator> { public: // types using value_type = bool; using allocator_type = Allocator; using pointer ...