value::try_as_bool
Return result with the underlying bool
Synopsis
boost::system::result< bool & >
try_as_bool() noexcept; (1)
boost::system::result< bool >
try_as_bool() const noexcept; (2)Description
If is_bool() is true, the result contains a reference to (1) or a copy to (2) the underlying bool, otherwise it contains an error_code.
Example
The return value can be used in both a boolean context and to assign a variable:
if( auto r = jv.try_as_bool() )
return *r;But can also be used to throw an exception on error:
return jv.try_as_bool().value();Complexity
Constant.
Exception Safety
No-throw guarantee.