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Access an element, with bounds checking.
value
const& at(std::size_t
pos,boost::source_location
const& loc = BOOST_CURRENT_LOCATION) const&;
This function is used to access elements of the underlying array, or throw an exception if the value is not an array.
Constant.
Strong guarantee.
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Description |
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A zero-based array index. |
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this->as_array(loc).at( pos, loc )
.