Merged utf branch changes r178:187 into the trunk

src/streamcharsource.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <cstddef>
+
+namespace YAML
+{
+	class StreamCharSource
+	{
+	public:
+		StreamCharSource(const Stream& stream);
+		~StreamCharSource() {}
+			
+		operator bool() const;
+		char operator [] (std::size_t i) const { return m_stream.CharAt(m_offset + i); }
+		bool operator !() const { return !static_cast<bool>(*this); }
+
+		const StreamCharSource operator + (int i) const;
+			
+	private:
+		std::size_t m_offset;
+		const Stream& m_stream;
+	};
+	
+	inline StreamCharSource::StreamCharSource(const Stream& stream): m_offset(0), m_stream(stream) {
+	}
+	
+	inline StreamCharSource::operator bool() const {
+		return m_stream.ReadAheadTo(m_offset);
+	}
+	
+	inline const StreamCharSource StreamCharSource::operator + (int i) const {
+		StreamCharSource source(*this);
+		if(static_cast<int> (source.m_offset) + i >= 0)
+			source.m_offset += i;
+		else
+			source.m_offset = 0;
+		return source;
+	}
+}