Try::tryGetExceptionObject

[folly.git] / folly / Try.h

diff --git a/folly/Try.h b/folly/Try.h
index fe963753b0f895642e44b3a203ca4360e4a78585..e5af11fa5fe4fb7aef845ca0ca9349325056acf7 100644 (file)
--- a/folly/Try.h
+++ b/folly/Try.h
@@ -211,6 +211,31 @@ class Try {
     return e_;
   }
 
+  /*
+   * @returns a pointer to the `std::exception` held by `*this`, if one is held;
+   *          otherwise, returns `nullptr`.
+   */
+  std::exception* tryGetExceptionObject() {
+    return hasException() ? e_.get_exception() : nullptr;
+  }
+  std::exception const* tryGetExceptionObject() const {
+    return hasException() ? e_.get_exception() : nullptr;
+  }
+
+  /*
+   * @returns a pointer to the `Ex` held by `*this`, if it holds an object whose
+   *          type `From` permits `std::is_convertible<From*, Ex*>`; otherwise,
+   *          returns `nullptr`.
+   */
+  template <class E>
+  E* tryGetExceptionObject() {
+    return hasException() ? e_.get_exception<E>() : nullptr;
+  }
+  template <class E>
+  E const* tryGetExceptionObject() const {
+    return hasException() ? e_.get_exception<E>() : nullptr;
+  }
+
   /*
    * If the Try contains an exception and it is of type Ex, execute func(Ex)
    *
@@ -339,6 +364,31 @@ class Try<void> {
     return e_;
   }
 
+  /*
+   * @returns a pointer to the `std::exception` held by `*this`, if one is held;
+   *          otherwise, returns `nullptr`.
+   */
+  std::exception* tryGetExceptionObject() {
+    return hasException() ? e_.get_exception() : nullptr;
+  }
+  std::exception const* tryGetExceptionObject() const {
+    return hasException() ? e_.get_exception() : nullptr;
+  }
+
+  /*
+   * @returns a pointer to the `Ex` held by `*this`, if it holds an object whose
+   *          type `From` permits `std::is_convertible<From*, Ex*>`; otherwise,
+   *          returns `nullptr`.
+   */
+  template <class E>
+  E* tryGetExceptionObject() {
+    return hasException() ? e_.get_exception<E>() : nullptr;
+  }
+  template <class E>
+  E const* tryGetExceptionObject() const {
+    return hasException() ? e_.get_exception<E>() : nullptr;
+  }
+
   /*
    * If the Try contains an exception and it is of type Ex, execute func(Ex)
    *