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 d970a5aed4.
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value::if_bool (1 of 2 overloads)

Return a bool pointer if this is a boolean, else return nullptr

Synopsis
bool const*
if_bool() const;
Description

If this->kind() == kind::bool_, returns a pointer to the underlying boolean. Otherwise, returns nullptr.

Example

The return value is used in both a boolean context and to assign a variable:

if ( auto p = jv.if_bool() )
    return *p;
Complexity

Constant.

Exception Safety

No-throw guarantee.


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