value::if_uint64
Return a uint64_t pointer if this is an unsigned integer, else return nullptr
Synopsis
std::uint64_t const*
if_uint64() const noexcept; (1)
std::uint64_t*
if_uint64() noexcept; (2)Description
If this->kind() == kind::uint64, returns a pointer to the underlying unsigned integer. Otherwise, returns nullptr.
Example
The return value is used in both a boolean context and to assign a variable:
if( auto p = jv.if_uint64() )
return *p;Complexity
Constant.
Exception Safety
No-throw guarantee.