object::insert (1 of 3 overloads)

Insert elements.

Synopsis

template<
    class P>
std::pair< iterator, bool >
insert(
    P&& p);

Inserts p if this->contains(value_type(p).key()) is false. value_type must be constructible from p. If the insertion occurs and results in a rehashing of the container, all iterators and references are invalidated. Otherwise, they are not affected. Rehashing occurs only if the new number of elements is greater than capacity().

Constraints

std::is_constructible_v<value_type, P>

Complexity

Average case amortized constant, worst case linear in size().

Exception Safety

Strong guarantee. Calls to memory_resource::allocate may throw.

Parameters

Name	Description
`p`	The value to insert.

Exceptions

Type	Thrown On
boost::system::system_error	key is too long.
boost::system::system_error	`size()` >= max_size().

Return Value

A pair where first is an iterator to the existing or inserted element, and second is true if the insertion took place or false otherwise.