object::count

`object::count`

Count the number of elements with a specific key.

std::size_t
count(
    string_view key) const noexcept;

This function returns the count of the number of elements match key. The only possible return values are 0 and 1.

Constant on average, worst case linear in size().

No-throw guarantee.

Name Description

Name	Description
`key`	The key of the element to find.

key

The key of the element to find.