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Return result
with a
reference to the underlying std::int64_t
boost::system::result
<std::int64_t
& > try_as_int64() noexcept;
If is_int64()
is true
, the result contains
a reference to the underlying std::int64_t
,
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_int64() ) return *r;
But can also be used to throw an exception on error:
return jv.try_as_int64().value();
Constant.
No-throw guarantee.