Merged utf branch changes r178:187 into the trunk

src/stringsource.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <cstddef>
+
+namespace YAML
+{
+	class StringCharSource
+	{
+	public:
+		StringCharSource(const char *str, std::size_t size): m_str(str), m_size(size), m_offset(0) {}
+
+		operator bool() const { return m_offset < m_size; }
+		char operator [] (std::size_t i) const { return m_str[m_offset + i]; }
+		bool operator !() const { return !static_cast<bool>(*this); }
+
+		const StringCharSource operator + (int i) const {
+			StringCharSource source(*this);
+			if(static_cast<int> (source.m_offset) + i >= 0)
+				source.m_offset += i;
+			else
+				source.m_offset = 0;
+			return source;
+		}
+			
+		StringCharSource& operator ++ () {
+			++m_offset;
+			return *this;
+		}
+	private:
+		const char *m_str;
+		std::size_t m_size;
+		std::size_t m_offset;
+	};
+}