Merge 2018-11 LWG Motion 9

P0972R0 <chrono> zero(), min(), and max() should be noexcept

Fixes #2415

Author: zygoloid

source/time.tex

@@ -1133,9 +1133,9 @@
 template<class Rep>
   struct duration_values {
   public:
-    static constexpr Rep zero();
-    static constexpr Rep min();
-    static constexpr Rep max();
+    static constexpr Rep zero() noexcept;
+    static constexpr Rep min() noexcept;
+    static constexpr Rep max() noexcept;
 };
 \end{itemdecl}
 
@@ -1149,7 +1149,7 @@
 
 \indexlibrarymember{zero}{duration_values}%
 \begin{itemdecl}
-static constexpr Rep zero();
+static constexpr Rep zero() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1164,7 +1164,7 @@
 
 \indexlibrarymember{min}{duration_values}%
 \begin{itemdecl}
-static constexpr Rep min();
+static constexpr Rep min() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1177,7 +1177,7 @@
 
 \indexlibrarymember{max}{duration_values}%
 \begin{itemdecl}
-static constexpr Rep max();
+static constexpr Rep max() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1314,9 +1314,9 @@
     constexpr duration& operator%=(const duration& rhs);
 
     // \ref{time.duration.special}, special values
-    static constexpr duration zero();
-    static constexpr duration min();
-    static constexpr duration max();
+    static constexpr duration zero() noexcept;
+    static constexpr duration min() noexcept;
+    static constexpr duration max() noexcept;
   };
 }
 \end{codeblock}
@@ -1573,7 +1573,7 @@
 
 \indexlibrarymember{zero}{duration}%
 \begin{itemdecl}
-static constexpr duration zero();
+static constexpr duration zero() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1583,7 +1583,7 @@
 
 \indexlibrarymember{min}{duration}%
 \begin{itemdecl}
-static constexpr duration min();
+static constexpr duration min() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1593,7 +1593,7 @@
 
 \indexlibrarymember{max}{duration}%
 \begin{itemdecl}
-static constexpr duration max();
+static constexpr duration max() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -2186,8 +2186,8 @@
     constexpr time_point& operator-=(const duration& d);
 
     // \ref{time.point.special}, special values
-    static constexpr time_point min();
-    static constexpr time_point max();
+    static constexpr time_point min() noexcept;
+    static constexpr time_point max() noexcept;
   };
 }
 \end{codeblock}
@@ -2333,7 +2333,7 @@
 
 \indexlibrarymember{min}{time_point}%
 \begin{itemdecl}
-static constexpr time_point min();
+static constexpr time_point min() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -2343,7 +2343,7 @@
 
 \indexlibrarymember{max}{time_point}%
 \begin{itemdecl}
-static constexpr time_point max();
+static constexpr time_point max() noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}