diff --git a/include/stdex/string.hpp b/include/stdex/string.hpp
index 5440db6a8..b41701faf 100644
--- a/include/stdex/string.hpp
+++ b/include/stdex/string.hpp
@@ -1066,6 +1066,103 @@ namespace stdex
 			reinterpret_cast<const utf16_t*>(str2), N2);
 	}
 
+	///
+	/// Binary compare two strings
+	///
+	/// \param[in] str1    String 1
+	/// \param[in] count1  String 1 code unit count limit
+	/// \param[in] str2    String 2
+	/// \param[in] count2  String 2 code unit count limit
+	///
+	/// \return Negative if str1<str2; positive if str1>str2; zero if str1==str2
+	///
+	inline int strncmp(
+		_In_reads_or_z_opt_(count1) const utf16_t* str1, _In_ size_t count1,
+		_In_reads_or_z_opt_(count2) const utf16_t* str2, _In_ size_t count2)
+	{
+		stdex_assert(str1 || !count1);
+		stdex_assert(str2 || !count2);
+		for (size_t i = 0, j = 0; ;) {
+			if (i >= count1 && j >= count2) return 0;
+			if (i >= count1 && j < count2) return -1;
+			if (i < count1 && j >= count2) return +1;
+
+			utf32_t a;
+			if (i + 1 >= count1 || !is_surrogate_pair(&str1[i])) {
+				a = static_cast<utf16_t>(str1[i]);
+				i++;
+			}
+			else {
+				a = surrogate_pair_to_ucs4(&str1[i]);
+				i += 2;
+			}
+			utf32_t b;
+			if (j + 1 >= count2 || !is_surrogate_pair(&str2[j])) {
+				b = static_cast<utf16_t>(str2[j]);
+				j++;
+			}
+			else {
+				b = surrogate_pair_to_ucs4(&str2[j]);
+				j += 2;
+			}
+			if (a < b) return -1;
+			if (a > b) return +1;
+		}
+	}
+
+	///
+	/// Binary compare two strings
+	///
+	/// \param[in] str1    String 1
+	/// \param[in] count1  String 1 code unit count limit
+	/// \param[in] str2    String 2
+	/// \param[in] count2  String 2 code unit count limit
+	///
+	/// \return Negative if str1<str2; positive if str1>str2; zero if str1==str2
+	///
+	inline int strncmp(
+		_In_reads_or_z_opt_(count1) const char16_t* str1, _In_ size_t count1,
+		_In_reads_or_z_opt_(count2) const char16_t* str2, _In_ size_t count2)
+	{
+		return strncmp(
+			reinterpret_cast<const utf16_t*>(str1), count1,
+			reinterpret_cast<const utf16_t*>(str2), count2);
+	}
+
+	///
+	/// Binary compare two strings
+	///
+	/// \param[in] str1  String 1
+	/// \param[in] str2  String 2
+	///
+	/// \return Negative if str1<str2; positive if str1>str2; zero if str1==str2
+	///
+	template <size_t N1, size_t N2>
+	int strncmp(
+		_In_ const utf16_t(&str1)[N1],
+		_In_ const utf16_t(&str2)[N2])
+	{
+		return strncmp(str1, N1, str2, N2);
+	}
+
+	///
+	/// Binary compare two strings
+	///
+	/// \param[in] str1  String 1
+	/// \param[in] str2  String 2
+	///
+	/// \return Negative if str1<str2; positive if str1>str2; zero if str1==str2
+	///
+	template <size_t N1, size_t N2>
+	int strncmp(
+		_In_ const char16_t(&str1)[N1],
+		_In_ const char16_t(&str2)[N2])
+	{
+		return strncmp(
+			reinterpret_cast<const utf16_t*>(str1), N1,
+			reinterpret_cast<const utf16_t*>(str2), N2);
+	}
+
 	///
 	/// Binary compare two strings in reverse direction
 	///