value::if

`value::if_bool`

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

bool const*
if_bool() const noexcept; (1)

bool*
if_bool() noexcept; (2)

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

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

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

Constant.

No-throw guarantee.