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value::if_double (1 of 2 overloads)

Return a double pointer if this is a double, else return nullptr

Synopsis
double const*
if_double() const;
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.


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