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Access the specified element, with bounds checking.
boost::system::result
<value
& > try_at(string_view
key) noexcept;
Returns boost::system::result
containing a reference to the
mapped value of the element that matches key
.
Otherwise the result contains an error_code
.
No-throw guarantee.
Name |
Description |
---|---|
|
The key of the element to find. |
Constant on average, worst case linear in size()
.