primitive_value.hpp

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#ifndef STAN_MATH_PRIM_FUN_PRIMITIVE_VALUE_HPP
#define STAN_MATH_PRIM_FUN_PRIMITIVE_VALUE_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/value_of.hpp>
#include <type_traits>
 
namespace stan {
namespace math {
 
template <typename T>
inline typename std::enable_if<std::is_arithmetic<T>::value, T>::type
primitive_value(T x) {
  return x;
}
 
template <typename T>
inline typename std::enable_if<!std::is_arithmetic<T>::value, double>::type
primitive_value(const T& x) {
  return value_of(x);
}
 
}  // namespace math
}  // namespace stan
#endif