Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Return a double pointer
if this is a double, else return nullptr
double* if_double();
If this->kind() == kind::double_,
returns a pointer to the underlying double. Otherwise, returns nullptr.
The return value is used in both a boolean context and to assign a variable:
if( auto p = jv.if_double() ) return *p;
Constant.
No-throw guarantee.