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Access an element, with bounds checking.
boost::system::result
<value
& > try_at(std::size_t
pos) noexcept;
Returns boost::system::result
containing a reference to the
element specified at location pos
,
if pos
is within the
range of the container. Otherwise the result contains an error_code
.
No-throw guarantee.
Name |
Description |
---|---|
|
A zero-based index. |
Constant.