1 #ifndef STAN_MATH_REV_SCAL_FUN_AS_BOOL_HPP 2 #define STAN_MATH_REV_SCAL_FUN_AS_BOOL_HPP bool as_bool(const T &x)
Return true if the argument is not equal to zero (in the != operator sense) and false otherwise...
Independent (input) and dependent (output) variables for gradients.
const double val_
The value of this variable.
vari * vi_
Pointer to the implementation of this variable.