c++: style: remove useless "inline" and fix space issues

* data/lalr1.cc, data/c++.m4: Formatting changes.
* data/stack.hh: Remove useless "inline".
Add documentation.
* data/location.cc: Prefer {} for empty bodies.

data/c++.m4

@@ -304,7 +304,6 @@ m4_define([b4_public_types_define],
                    [value = other.value;])[
   }
 
-
   template <typename Base>
   inline
   ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(

data/location.cc

@@ -33,8 +33,7 @@ m4_define([b4_position_define],
       : filename (f)
       , line (l)
       , column (c)
-    {
-    }
+    {}
 
 ]])[
     /// Initialization.
@@ -157,15 +156,13 @@ m4_define([b4_location_define],
     location (const position& b, const position& e)
       : begin (b)
       , end (e)
-    {
-    }
+    {}
 
     /// Construct a 0-width location in \a p.
     explicit location (const position& p = position ())
       : begin (p)
       , end (p)
-    {
-    }
+    {}
 
     /// Construct a 0-width location in \a f, \a l, \a c.
     explicit location (]b4_percent_define_get([[filename_type]])[* f,
@@ -173,8 +170,7 @@ m4_define([b4_location_define],
                        unsigned int c = ]b4_location_initial_column[u)
       : begin (f, l, c)
       , end (f, l, c)
-    {
-    }
+    {}
 
 ])[
     /// Initialization.

data/stack.hh

@@ -21,7 +21,8 @@ m4_pushdef([b4_copyright_years],
 # b4_stack_define
 # ---------------
 m4_define([b4_stack_define],
-[[  template <class T, class S = std::vector<T> >
+[[  /// A stack with random access from its top.
+  template <class T, class S = std::vector<T> >
   class stack
   {
   public:
@@ -39,14 +40,18 @@ m4_define([b4_stack_define],
       : seq_ (n)
     {}
 
-    inline
+    /// Random access.
+    ///
+    /// Index 0 returns the topmost element.
     T&
     operator[] (unsigned int i)
     {
       return seq_[seq_.size () - 1 - i];
     }
 
-    inline
+    /// Random access.
+    ///
+    /// Index 0 returns the topmost element.
     const T&
     operator[] (unsigned int i) const
     {
@@ -56,7 +61,6 @@ m4_define([b4_stack_define],
     /// Steal the contents of \a t.
     ///
     /// Close to move-semantics.
-    inline
     void
     push (T& t)
     {
@@ -64,7 +68,6 @@ m4_define([b4_stack_define],
       operator[](0).move (t);
     }
 
-    inline
     void
     pop (unsigned int n = 1)
     {
@@ -78,21 +81,18 @@ m4_define([b4_stack_define],
       seq_.clear ();
     }
 
-    inline
     typename S::size_type
     size () const
     {
       return seq_.size ();
     }
 
-    inline
     const_iterator
     begin () const
     {
       return seq_.rbegin ();
     }
 
-    inline
     const_iterator
     end () const
     {
@@ -116,7 +116,6 @@ m4_define([b4_stack_define],
       , range_ (range)
     {}
 
-    inline
     const T&
     operator [] (unsigned int i) const
     {