Returns a reference to the first element in the container.

Ifempty() istrue:

• If the implementation ishardened, acontract violation occurs. Moreover, if the contract-violation handler returns under “observe” evaluation semantic, the behavior is undefined.
• If the implementation is not hardened, the behavior is undefined.

[edit]Return value

Reference to the first element.

[edit]Complexity

Constant.

[edit]Notes

For a containerc, the expressionc.front() is equivalent to*c.begin().

[edit]Example

#include <cassert>#include <inplace_vector> int main(){std::inplace_vector<char,4> letters{'a','b','c','d'};assert(letters.front()=='a');}

[edit]See also

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