From a289f6302cfc84fa0e0c216a006517bfaf697a32 Mon Sep 17 00:00:00 2001
From: Shane Loretz <sloretz@osrfoundation.org>
Date: Thu, 31 May 2018 16:10:43 -0700
Subject: [PATCH] ParameterTypeException inherit from runtime_error

---
 rclcpp/include/rclcpp/parameter_value.hpp | 34 +++++++++--------------
 rclcpp/src/rclcpp/parameter_value.cpp     | 16 -----------
 2 files changed, 13 insertions(+), 37 deletions(-)

diff --git a/rclcpp/include/rclcpp/parameter_value.hpp b/rclcpp/include/rclcpp/parameter_value.hpp
index 9a6a737fc4..120f3619d1 100644
--- a/rclcpp/include/rclcpp/parameter_value.hpp
+++ b/rclcpp/include/rclcpp/parameter_value.hpp
@@ -42,25 +42,26 @@ enum ParameterType
   PARAMETER_STRING_ARRAY = rcl_interfaces::msg::ParameterType::PARAMETER_STRING_ARRAY,
 };
 
+/// Return the name of a parameter type
+RCLCPP_PUBLIC
+std::string
+to_string(const ParameterType type);
+
+RCLCPP_PUBLIC
+std::ostream &
+operator<<(std::ostream & os, const ParameterType type);
+
 /// Indicate the parameter type does not match the expected type.
-class ParameterTypeException : public std::exception
+class ParameterTypeException : public std::runtime_error
 {
 public:
   /// Construct an instance.
   /// \param[in] expected the expected parameter type.
   /// \param[in] actual the actual parameter type.
   RCLCPP_PUBLIC
-  ParameterTypeException(ParameterType expected, ParameterType actual);
-
-  RCLCPP_PUBLIC
-  ~ParameterTypeException();
-
-  RCLCPP_PUBLIC
-  const char *
-  what() const noexcept override;
-
-private:
-  const std::string msg_;
+  ParameterTypeException(ParameterType expected, ParameterType actual)
+  : std::runtime_error("expected [" + to_string(expected) + "] got [" + to_string(actual) + "]")
+  {}
 };
 
 /// Store the type and value of a parameter.
@@ -308,15 +309,6 @@ RCLCPP_PUBLIC
 std::string
 to_string(const ParameterValue & type);
 
-/// Return the name of a parameter type
-RCLCPP_PUBLIC
-std::string
-to_string(const ParameterType type);
-
-RCLCPP_PUBLIC
-std::ostream &
-operator<<(std::ostream & os, const ParameterType type);
-
 }  // namespace rclcpp
 
 #endif  // RCLCPP__PARAMETER_VALUE_HPP_
diff --git a/rclcpp/src/rclcpp/parameter_value.cpp b/rclcpp/src/rclcpp/parameter_value.cpp
index c65da5bb3c..0bd5518ed0 100644
--- a/rclcpp/src/rclcpp/parameter_value.cpp
+++ b/rclcpp/src/rclcpp/parameter_value.cpp
@@ -18,7 +18,6 @@
 #include <vector>
 
 using rclcpp::ParameterType;
-using rclcpp::ParameterTypeException;
 using rclcpp::ParameterValue;
 
 std::string
@@ -57,21 +56,6 @@ rclcpp::operator<<(std::ostream & os, const ParameterType type)
   return os;
 }
 
-ParameterTypeException::ParameterTypeException(ParameterType expected, ParameterType actual)
-: msg_("expected [" + rclcpp::to_string(expected) + "] got [" + rclcpp::to_string(actual) + "]")
-{
-}
-
-ParameterTypeException::~ParameterTypeException()
-{
-}
-
-const char *
-ParameterTypeException::what() const throw ()
-{
-  return msg_.c_str();
-}
-
 template<typename ValType, typename PrintType = ValType>
 std::string
 array_to_string(