[rand.adapt.ibits,rand.dist.pois.poisson] Add namespace std in class template

[rand.adapt.ibits] 28.5.5.3-4
[rand.dist.pois.poisson] 28.5.9.4.1-1

Author: Andreas-Krug

source/numerics.tex

@@ -3308,7 +3308,8 @@
 \indexlibraryglobal{independent_bits_engine}%
 \indexlibrarymember{result_type}{independent_bits_engine}%
 \begin{codeblock}
-template<class Engine, size_t w, class UIntType>
+namespace std {
+  template<class Engine, size_t w, class UIntType>
   class independent_bits_engine {
   public:
     // types
@@ -3349,6 +3350,7 @@
   private:
     Engine e;   // \expos
   };
+}
 \end{codeblock}%
 
 \pnum
@@ -4807,9 +4809,9 @@
 \indexlibraryglobal{poisson_distribution}%
 \indexlibrarymember{result_type}{poisson_distribution}%
 \begin{codeblock}
-template<class IntType = int>
-  class poisson_distribution
-  {
+namespace std {
+  template<class IntType = int>
+  class poisson_distribution {
   public:
     // types
     using result_type = IntType;
@@ -4845,6 +4847,7 @@
       friend basic_istream<charT, traits>&
         operator>>(basic_istream<charT, traits>& is, poisson_distribution& x);
   };
+}
 \end{codeblock}
 
 \indexlibraryctor{poisson_distribution}%