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

This is the documentation for a snapshot of the develop branch, built from commit 2daa88693b.

value::try_at (1 of 4 overloads)

Access an element, with bounds checking.

Synopsis

boost::system::result< value & >
try_at(
    string_view key) noexcept;

Description

Returns boost::system::result containing a reference to the element of the underlying object, if pos is within its range. If pos is outside of that range, or the underlying value is not an object the result contains an error_code.

Exception Safety

No-throw guarantee.

Parameters

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

Complexity

Constant.