var matrix specializations for a-c unary functions in rev

stan/math/prim/fun/abs.hpp

@@ -10,50 +10,50 @@
 namespace stan {
 namespace math {
 
- /**
-  * Structure to wrap `abs()` so it can be vectorized.
-  *
-  * @tparam T type of variable
-  * @param x argument
-  * @return Arc cosine of variable in radians.
-  */
- struct abs_fun {
-   template <typename T>
-   static inline T fun(const T& x) {
-     using std::fabs;
-     return fabs(x);
-   }
- };
+/**
+ * Structure to wrap `abs()` so it can be vectorized.
+ *
+ * @tparam T type of variable
+ * @param x argument
+ * @return Arc cosine of variable in radians.
+ */
+struct abs_fun {
+  template <typename T>
+  static inline T fun(const T& x) {
+    using std::fabs;
+    return fabs(x);
+  }
+};
 
- /**
-  * Returns the elementwise `abs()` of the input,
-  * which may be a scalar or any Stan container of numeric scalars.
-  *
-  * @tparam Container type of container
-  * @param x argument
-  * @return Arc cosine of each variable in the container, in radians.
-  */
- template <typename Container,
-           require_not_container_st<std::is_arithmetic, Container>* = nullptr,
-           require_not_var_matrix_t<Container>* = nullptr>
- inline auto abs(const Container& x) {
-   return apply_scalar_unary<abs_fun, Container>::apply(x);
- }
+/**
+ * Returns the elementwise `abs()` of the input,
+ * which may be a scalar or any Stan container of numeric scalars.
+ *
+ * @tparam Container type of container
+ * @param x argument
+ * @return Arc cosine of each variable in the container, in radians.
+ */
+template <typename Container,
+          require_not_container_st<std::is_arithmetic, Container>* = nullptr,
+          require_not_var_matrix_t<Container>* = nullptr>
+inline auto abs(const Container& x) {
+  return apply_scalar_unary<abs_fun, Container>::apply(x);
+}
 
- /**
-  * Version of `abs()` that accepts std::vectors, Eigen Matrix/Array objects
-  *  or expressions, and containers of these.
-  *
-  * @tparam Container Type of x
-  * @param x argument
-  * @return Arc cosine of each variable in the container, in radians.
-  */
- template <typename Container,
-           require_container_st<std::is_arithmetic, Container>* = nullptr>
- inline auto abs(const Container& x) {
-   return apply_vector_unary<Container>::apply(
-       x, [](const auto& v) { return v.array().abs(); });
- }
+/**
+ * Version of `abs()` that accepts std::vectors, Eigen Matrix/Array objects
+ *  or expressions, and containers of these.
+ *
+ * @tparam Container Type of x
+ * @param x argument
+ * @return Arc cosine of each variable in the container, in radians.
+ */
+template <typename Container,
+          require_container_st<std::is_arithmetic, Container>* = nullptr>
+inline auto abs(const Container& x) {
+  return apply_vector_unary<Container>::apply(
+      x, [](const auto& v) { return v.array().abs(); });
+}
 
 namespace internal {
 /**