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 an older version of Boost and was released in 2022. The current version is 1.90.0.

value::if_bool (1 of 2 overloads)

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.