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Return a uint64_t
pointer
if this is an unsigned integer, else return nullptr
std::uint64_t* if_uint64();
If this->kind() == kind::uint64
,
returns a pointer to the underlying unsigned integer. Otherwise, returns
nullptr
.
The return value is used in both a boolean context and to assign a variable:
if ( auto p = jv.if_uint64() ) return *p;
Constant.
No-throw guarantee.