From 09e821619e20943af7bbd61ad10fb5ae40d2558c Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Thu, 13 Jul 2017 11:33:06 +0200
Subject: Refactor exceptions and provide comment function.

---
 libdevcore/CommonData.h   |  3 ++-
 libdevcore/Exceptions.cpp | 49 +++++++++++++++++++++++++++++++++++++++++++++++
 libdevcore/Exceptions.h   | 20 +++++++------------
 3 files changed, 58 insertions(+), 14 deletions(-)
 create mode 100644 libdevcore/Exceptions.cpp

(limited to 'libdevcore')

diff --git a/libdevcore/CommonData.h b/libdevcore/CommonData.h
index 98ad548d..4297f606 100644
--- a/libdevcore/CommonData.h
+++ b/libdevcore/CommonData.h
@@ -23,13 +23,14 @@
 
 #pragma once
 
+#include <libdevcore/Common.h>
+
 #include <vector>
 #include <algorithm>
 #include <unordered_set>
 #include <type_traits>
 #include <cstring>
 #include <string>
-#include "Common.h"
 
 namespace dev
 {
diff --git a/libdevcore/Exceptions.cpp b/libdevcore/Exceptions.cpp
new file mode 100644
index 00000000..f422d926
--- /dev/null
+++ b/libdevcore/Exceptions.cpp
@@ -0,0 +1,49 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <libdevcore/Exceptions.h>
+
+#include <boost/lexical_cast.hpp>
+
+using namespace std;
+using namespace dev;
+
+char const* Exception::what() const noexcept
+{
+	if (string const* cmt = comment())
+		return cmt->c_str();
+	else
+		return nullptr;
+}
+
+string Exception::lineInfo() const
+{
+	char const* const* file = boost::get_error_info<boost::throw_file>(*this);
+	int const* line = boost::get_error_info<boost::throw_line>(*this);
+	string ret;
+	if (file)
+		ret += *file;
+	ret += ':';
+	if (line)
+		ret += boost::lexical_cast<string>(*line);
+	return ret;
+}
+
+string const* Exception::comment() const noexcept
+{
+	return boost::get_error_info<errinfo_comment>(*this);
+}
diff --git a/libdevcore/Exceptions.h b/libdevcore/Exceptions.h
index 4817e9e3..a3e638bf 100644
--- a/libdevcore/Exceptions.h
+++ b/libdevcore/Exceptions.h
@@ -14,23 +14,16 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
-/** @file Exceptions.h
- * @author Gav Wood <i@gavwood.com>
- * @date 2014
- */
 
 #pragma once
 
-#include <exception>
-#include <string>
 #include <boost/exception/exception.hpp>
 #include <boost/exception/info.hpp>
 #include <boost/exception/info_tuple.hpp>
 #include <boost/exception/diagnostic_information.hpp>
-#include <boost/throw_exception.hpp>
-#include <boost/tuple/tuple.hpp>
-#include "CommonData.h"
-#include "FixedHash.h"
+
+#include <exception>
+#include <string>
 
 namespace dev
 {
@@ -38,14 +31,15 @@ namespace dev
 /// Base class for all exceptions.
 struct Exception: virtual std::exception, virtual boost::exception
 {
-	Exception(std::string _message = std::string()): m_message(std::move(_message)) {}
-	const char* what() const noexcept override { return m_message.empty() ? std::exception::what() : m_message.c_str(); }
+	const char* what() const noexcept override;
 
 	/// @returns "FileName:LineNumber" referring to the point where the exception was thrown.
 	std::string lineInfo() const;
 
+	/// @returns the errinfo_comment of this exception.
+	std::string const* comment() const noexcept;
+
 private:
-	std::string m_message;
 };
 
 #define DEV_SIMPLE_EXCEPTION(X) struct X: virtual Exception { const char* what() const noexcept override { return #X; } }
-- 
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