c++: minor changes

* data/lalr1.cc: Fix oldish comment.
* data/stack.hh: Prefer typename for type names.
Use size() instead of duplicating it.
* examples/variant-11.yy, examples/variant.yy (yylex): Use int,
as this is the type of the semantic value.

TODO

@@ -1,4 +1,10 @@
 * Short term
+** C++
+Move to int everywhere instead of unsigned?  stack_size, etc.  The parser
+itself uses int (for yylen for instance), yet stack is based on size_t.
+
+Maybe locations should also move to ints.
+
 ** Graphviz display code thoughts
 The code for the --graph option is over two files: print_graph, and
 graphviz. This is because Bison used to also produce VCG graphs, but since

data/lalr1.cc

@@ -359,7 +359,7 @@ m4_define([b4_shared_declarations],
     /// \warning the contents of \a sym.value is stolen.
     void yypush_ (const char* m, state_type s, YY_MOVE_REF (symbol_type) sym);
 
-    /// Pop \a n symbols the three stacks.
+    /// Pop \a n symbols from the stack.
     void yypop_ (unsigned n = 1);
 
     /// Constants.

data/stack.hh

@@ -27,7 +27,7 @@ b4_defines_if([b4_required_version_if([302], [],
 # ---------------
 m4_define([b4_stack_define],
 [[  /// A stack with random access from its top.
-  template <class T, class S = std::vector<T> >
+  template <typename T, typename S = std::vector<T> >
   class stack
   {
   public:
@@ -46,7 +46,7 @@ m4_define([b4_stack_define],
     T&
     operator[] (size_type i)
     {
-      return seq_[seq_.size () - 1 - i];
+      return seq_[size () - 1 - i];
     }
 
     /// Random access.
@@ -55,7 +55,7 @@ m4_define([b4_stack_define],
     const T&
     operator[] (size_type i) const
     {
-      return seq_[seq_.size () - 1 - i];
+      return seq_[size () - 1 - i];
     }
 
     /// Steal the contents of \a t.
@@ -107,7 +107,7 @@ m4_define([b4_stack_define],
   };
 
   /// Present a slice of the top of a stack.
-  template <class T, class S = stack<T> >
+  template <typename T, typename S = stack<T> >
   class slice
   {
   public:

doc/bison.texi

@@ -11723,7 +11723,7 @@ The rules are simple.  The driver is used to report errors.
   if (! (INT_MIN <= n && n <= INT_MAX && errno != ERANGE))
     throw yy::parser::syntax_error (loc, "integer is out of range: "
                                     + std::string(yytext));
-  return yy::parser::make_NUMBER (n, loc);
+  return yy::parser::make_NUMBER (int (n), loc);
 @}
 @end group
 @{id@}       return yy::parser::make_IDENTIFIER (yytext, loc);

examples/variant-11.yy

@@ -124,10 +124,10 @@ namespace yy
   parser::symbol_type
   yylex ()
   {
-    static auto count = 0u;
-    const auto stage = count;
+    static int count = 0;
+    const int stage = count;
     ++count;
-    auto loc = parser::location_type{nullptr, stage + 1, stage + 1};
+    auto loc = parser::location_type{nullptr, unsigned (stage + 1), unsigned (stage + 1)};
     if (stage == 0)
       return parser::make_TEXT (make_string_uptr ("I have numbers for you."), std::move (loc));
     else if (stage < max)

examples/variant.yy

@@ -114,9 +114,10 @@ namespace yy
   parser::symbol_type
   yylex ()
   {
-    static int stage = -1;
-    ++stage;
-    parser::location_type loc (nullptr, stage + 1, stage + 1);
+    static int count = 0;
+    const int stage = count;
+    ++count;
+    parser::location_type loc (nullptr, unsigned (stage + 1), unsigned (stage + 1));
     switch (stage)
       {
       case 0: