value::if_int64
Return an int64_t pointer if this is a signed integer, else return nullptr
Synopsis
std::int64_t const*
if_int64() const noexcept; (1)
std::int64_t*
if_int64() noexcept; (2)Description
If this->kind() == kind::int64, returns a pointer to the underlying 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_int64() )
return *p;Complexity
Constant.
Exception Safety
No-throw guarantee.