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Return result with a
reference to the underlying std::uint64_t
boost::system::result<std::uint64_t& > try_as_uint64() noexcept;
If is_uint64()
is true, the result contains
a reference to the underlying std::uint64_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_uint64() ) return *r;
But can also be used to throw an exception on error:
return jv.try_as_uint64().value();
Constant.
No-throw guarantee.