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Return result
with a
reference to the underlying double
boost::system::result
< double & >
try_as_double() noexcept;
If is_double()
is true
, the result contains
a reference to the underlying double
,
otherwise it contains an error_code
.
The return value can be used in both a boolean context and to assign a variable:
if( auto r = jv.try_as_double() ) return *r;
But can also be used to throw an exception on error:
return jv.try_as_double().value();
Constant.
No-throw guarantee.