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