This section lists functions that are specific to the active data types and tape management. For mathematical functions, Mathematical Operations.
#!c++ value(T& x) returns a reference (or const-reference if x is constant) to the value
stored in x.
If x is a XAD active data type, such as AReal or FReal,
this function returns a reference to the stored value (which is assignable).
If x is a passive data type, this function simple returns the value itself.
This function is especially useful in generic code, as it is defined on any data type.
#!c++ derivative(const T& x) returns a reference (or const-reference if x is constant) to the derivative stored in x.
If x is a XAD active data type, such as AReal or FReal,
this function returns a reference to the stored derivative (which is assignable).
If x is a passive data type, this function simply returns 0.
This function is especially useful in generic code, as it is defined on any data type.