don't use insert

include/sp/common/DataBuffer.h

@@ -204,8 +204,6 @@ class DataBuffer {
 		return m_Buffer == other.m_Buffer;
 	}
 
-	void insert(iterator a_DestBegin, const_iterator a_SrcBegin, const_iterator a_SrcEnd);
-
 	iterator begin();
 	iterator end();
 	const_iterator begin() const;

src/sp/common/DataBuffer.cpp

@@ -29,7 +29,9 @@ DataBuffer& operator<<(DataBuffer& a_Buffer, const std::string& str) {
 }
 
 DataBuffer& operator<<(DataBuffer& a_Buffer, const DataBuffer& data) {
-	a_Buffer.insert(a_Buffer.end(), data.begin(), data.end());
+	std::size_t end = a_Buffer.GetSize();
+	a_Buffer.Resize(a_Buffer.GetSize() + data.GetSize());
+	std::copy(data.begin(), data.end(), a_Buffer.begin() + end);
 	return a_Buffer;
 }
 
@@ -147,8 +149,4 @@ void DataBuffer::WriteFile(const std::string& fileName) const {
 	file.flush();
 }
 
-void DataBuffer::insert(iterator a_DestBegin, const_iterator a_SrcBegin, const_iterator a_SrcEnd) {
-	m_Buffer.insert(a_DestBegin, a_SrcBegin, a_SrcEnd);
-}
-
 }  // namespace sp