Merge pull request #84 from cyanray/dev/cyanray

新增: MessageChain 支持 Insert 方法.

Author: cyanray

UnitTest/main.cpp

@@ -62,6 +62,16 @@ TEST(MessageChain_Test, Add_and_Get3) {
     ASSERT_STREQ("Hello", m.Text().c_str());
 }
 
+TEST(MessageChain_Test, Insert_and_Get) {
+    using namespace Cyan;
+    MessageChain mc;
+    mc.Add<PlainMessage>("OOOOOO");
+    mc.Insert(mc.begin(), PlainMessage("Hello"));
+    ASSERT_TRUE(mc[0]->GetType() == "Plain");
+    auto mptr = std::dynamic_pointer_cast<PlainMessage>(mc[0]);
+    ASSERT_STREQ("Hello", mptr->Text().c_str());
+}
+
 TEST(MessageChain_Test, GetAll) {
     using namespace Cyan;
     MessageChain mc;

include/mirai/defs/message_chain.hpp

@@ -99,6 +99,15 @@ namespace Cyan
 			return *this;
 		}
 
+		template<class Iterator, class T>
+		void Insert(const Iterator& iterator, T&& m)
+		{
+			using real_type = typename std::remove_const<typename std::remove_reference<T>::type >::type;
+			static_assert(std::is_base_of<IMessage, real_type>::value, "只能接受 IMessage 的派生类");
+			std::shared_ptr<IMessage> m_ptr(new real_type(std::forward<T>(m)));
+			messages_.insert(iterator, std::move(m_ptr));
+		}
+
 		template<class T>
 		void Remove(const T& m)
 		{