literal suffixes for std::chrono

llvm-svn: 187078
diff --git a/libcxx/include/chrono b/libcxx/include/chrono
index c6eef8f..219e20e 100644
--- a/libcxx/include/chrono
+++ b/libcxx/include/chrono
@@ -259,6 +259,19 @@
 
 }  // chrono
 
+constexpr chrono::hours                                 operator "" h(unsigned long long); // C++14
+constexpr chrono::duration<unspecified , ratio<3600,1>> operator "" h(long double); // C++14
+constexpr chrono::minutes                               operator "" min(unsigned long long); // C++14
+constexpr chrono::duration<unspecified , ratio<60,1>>   operator "" min(long double); // C++14
+constexpr chrono::seconds                               operator "" s(unsigned long long); // C++14
+constexpr chrono::duration<unspecified >                operator "" s(long double); // C++14
+constexpr chrono::milliseconds                          operator "" ms(unsigned long long); // C++14
+constexpr chrono::duration<unspecified , milli>         operator "" ms(long double); // C++14
+constexpr chrono::microseconds                          operator "" us(unsigned long long); // C++14
+constexpr chrono::duration<unspecified , micro>         operator "" us(long double); // C++14
+constexpr chrono::nanoseconds                           operator "" ns(unsigned long long); // C++14
+constexpr chrono::duration<unspecified , nano>          operator "" ns(long double); // C++14
+
 }  // std
 */
 
@@ -893,6 +906,84 @@
 
 } // chrono
 
+#if _LIBCPP_STD_VER > 11 
+// Literal suffixes for chrono types
+// inline // Deviation from N3690.
+//    We believe the inline to be a defect and have submitted an LWG issue.
+//    An LWG issue number has not yet been assigned.
+namespace literals
+{ 
+  inline namespace chrono_literals
+  {
+
+	constexpr chrono::hours operator"" h(unsigned long long __h)
+	{
+		return chrono::hours(static_cast<chrono::hours::rep>(__h));
+	}
+
+	constexpr chrono::duration<long double, ratio<3600,1>> operator"" h(long double __h)
+	{
+		return chrono::duration<long double, ratio<3600,1>>(__h);
+	}
+
+
+	constexpr chrono::minutes operator"" min(unsigned long long __m)
+	{
+		return chrono::minutes(static_cast<chrono::minutes::rep>(__m));
+	}
+
+	constexpr chrono::duration<long double, ratio<60,1>> operator"" min(long double __m)
+	{
+		return chrono::duration<long double, ratio<60,1>> (__m);
+	}
+
+
+	constexpr chrono::seconds operator"" s(unsigned long long __s)
+	{
+		return chrono::seconds(static_cast<chrono::seconds::rep>(__s));
+	}
+
+	constexpr chrono::duration<long double> operator"" s(long double __s)
+	{
+		return chrono::duration<long double> (__s);
+	}
+
+
+	constexpr chrono::milliseconds operator"" ms(unsigned long long __ms)
+	{
+		return chrono::milliseconds(static_cast<chrono::milliseconds::rep>(__ms));
+	}
+
+	constexpr chrono::duration<long double, milli> operator"" ms(long double __ms)
+	{
+		return chrono::duration<long double, milli>(__ms);
+	}
+
+
+	constexpr chrono::microseconds operator"" us(unsigned long long __us)
+	{
+		return chrono::microseconds(static_cast<chrono::microseconds::rep>(__us));
+	}
+
+	constexpr chrono::duration<long double, micro> operator"" us(long double __us)
+	{
+		return chrono::duration<long double, micro> (__us);
+	}
+	
+
+	constexpr chrono::nanoseconds operator"" ns(unsigned long long __ns)
+	{
+		return chrono::nanoseconds(static_cast<chrono::nanoseconds::rep>(__ns));
+	}
+
+	constexpr chrono::duration<long double, nano> operator"" ns(long double __ns)
+	{
+		return chrono::duration<long double, nano> (__ns);
+	}
+
+}}
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif  // _LIBCPP_CHRONO