value::if_string

`value::if_string`

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

string const*
if_string() const noexcept; (1)

string*
if_string() noexcept; (2)

If this->kind() == kind::string, returns a pointer to the underlying object. Otherwise, returns nullptr.

The return value is used in both a boolean context and to assign a variable:

if( auto p = jv.if_string() )
    return *p;

Constant.

No-throw guarantee.