Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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value::at (4 of 6 overloads)

Access an element, with bounds checking.

Synopsis
value&
at(
    std::size_t pos,
    boost::source_location const& loc = BOOST_CURRENT_LOCATION) &;
Description

This function is used to access elements of the underlying array, or throw an exception if the value is not an array.

Complexity

Constant.

Exception Safety

Strong guarantee.

Parameters

Name

Description

pos

A zero-based array index.

loc

source_location to use in thrown exception; the source location of the call site by default.

Return Value

this->as_array(loc).at( pos, loc ).


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