LWG4224 Philox engines should be freestanding

Author: burblebee

source/numerics.tex

@@ -1403,7 +1403,7 @@
 
   // \ref{rand.eng.philox}, class template \tcode{philox_engine}
   template<class UIntType, size_t w, size_t n, size_t r, UIntType... consts>
-    class philox_engine;
+    class philox_engine;                                        // partially freestanding
 
   // \ref{rand.predef}, engines and engine adaptors with predefined parameters
   using minstd_rand0  = @\seebelow@;      // freestanding
@@ -1415,8 +1415,8 @@
   using ranlux24      = @\seebelow@;      // freestanding
   using ranlux48      = @\seebelow@;      // freestanding
   using knuth_b       = @\seebelow@;
-  using philox4x32    = @\seebelow@;
-  using philox4x64    = @\seebelow@;
+  using philox4x32    = @\seebelow@;      // freestanding
+  using philox4x64    = @\seebelow@;      // freestanding
 
   using default_random_engine = @\seebelow@;
 
@@ -3303,10 +3303,10 @@
     // inserters and extractors
     template<class charT, class traits>
       friend basic_ostream<charT, traits>&
-        operator<<(basic_ostream<charT, traits>& os, const philox_engine& x);
+        operator<<(basic_ostream<charT, traits>& os, const philox_engine& x);   // hosted
     template<class charT, class traits>
       friend basic_istream<charT, traits>&
-        operator>>(basic_istream<charT, traits>& is, philox_engine& x);
+        operator>>(basic_istream<charT, traits>& is, philox_engine& x);         // hosted
   };
 }
 \end{codeblock}