X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/733fb7c593486846eca5a60d1e3ff6880ce358d7..312c0cff71e784e116c0ecac4c33bc94d54f78de:/data/variant.hh

diff --git a/data/variant.hh b/data/variant.hh
index 1b033886..da0d2a39 100644
--- a/data/variant.hh
+++ b/data/variant.hh
@@ -72,7 +72,6 @@ m4_map([      b4_symbol_tag_comment], [$@])dnl
 # The needed includes for variants support.
 m4_define([b4_variant_includes],
 [b4_parse_assert_if([[#include <typeinfo>]])[
-#include <cstdlib>  // abort
 #ifndef YYASSERT
 # include <cassert>
 # define YYASSERT assert
@@ -100,13 +99,29 @@ m4_define([b4_variant_define],
       , tname (YY_NULL)])[
     {}
 
-    /// Instantiate a \a T in here.
+    /// Construct and fill.
+    template <typename T>
+    variant (const T& t)]b4_parse_assert_if([
+      : built (true)
+      , tname (typeid (T).name ())])[
+    {
+      YYASSERT (sizeof (T) <= S);
+      new (buffer.raw) T (t);
+    }
+
+    /// Destruction, allowed only if empty.
+    ~variant ()
+    {]b4_parse_assert_if([
+      YYASSERT (!built);
+    ])[}
+
+    /// Instantiate an empty \a T in here.
     template <typename T>
     T&
     build ()
     {]b4_parse_assert_if([
-      //YYASSERT (!built);
-      //YYASSERT (!tname);
+      YYASSERT (!built);
+      YYASSERT (!tname);
       YYASSERT (sizeof (T) <= S);
       built = true;
       tname = typeid (T).name ();])[
@@ -118,24 +133,14 @@ m4_define([b4_variant_define],
     T&
     build (const T& t)
     {]b4_parse_assert_if([
-      //YYASSERT (!built);
-      //YYASSERT (!tname);
+      YYASSERT (!built);
+      YYASSERT (!tname);
       YYASSERT (sizeof (T) <= S);
       built = true;
       tname = typeid (T).name ();])[
       return *new (buffer.raw) T (t);
     }
 
-    /// Construct and fill.
-    template <typename T>
-    variant (const T& t)]b4_parse_assert_if([
-      : built (true)
-      , tname (typeid (T).name ())])[
-    {
-      YYASSERT (sizeof (T) <= S);
-      new (buffer.raw) T (t);
-    }
-
     /// Accessor to a built \a T.
     template <typename T>
     T&
@@ -159,11 +164,12 @@ m4_define([b4_variant_define],
     }
 
     /// Swap the content with \a other, of same type.
+    ///
     /// Both variants must be built beforehand, because swapping the actual
     /// data requires reading it (with as()), and this is not possible on
     /// unconstructed variants: it would require some dynamic testing, which
     /// should not be the variant's responsability.
-    /// Swapping between built and ((possibly) non-built is done with
+    /// Swapping between built and (possibly) non-built is done with
     /// variant::move ().
     template <typename T>
     void
@@ -175,7 +181,8 @@ m4_define([b4_variant_define],
       std::swap (as<T>(), other.as<T>());
     }
 
-    /// Assign the content of \a other to this.
+    /// Move the content of \a other to this.
+    ///
     /// Destroys \a other.
     template <typename T>
     void
@@ -188,7 +195,6 @@ m4_define([b4_variant_define],
     }
 
     /// Copy the content of \a other to this.
-    /// Destroys \a other.
     template <typename T>
     void
     copy (const variant<S>& other)
@@ -206,19 +212,11 @@ m4_define([b4_variant_define],
       tname = YY_NULL;])[
     }
 
+  private:
     /// Prohibit blind copies.
-    private:
-    self_type& operator=(const self_type&)
-    {
-      abort ();
-    }
-
-    variant (const self_type&)
-    {
-      abort ();
-    }
+    self_type& operator=(const self_type&);
+    variant (const self_type&);
 
-  private:
     /// A buffer large enough to store any of the semantic values.
     /// Long double is chosen as it has the strongest alignment
     /// constraints.
@@ -227,7 +225,8 @@ m4_define([b4_variant_define],
       long double align_me;
       char raw[S];
     } buffer;]b4_parse_assert_if([
-    /// Whether something is contained.
+
+    /// Whether the content is built.
     bool built;
     /// If defined, the name of the stored type.
     const char* tname;])[
@@ -312,14 +311,15 @@ m4_define([b4_symbol_constructor_define_],
   b4_parser_class_name::make_[]b4_symbol_([$1], [id]) (dnl
 b4_join(b4_symbol_if([$1], [has_type],
                      [const b4_symbol([$1], [type])& v]),
-        b4_locations_if([const location_type& l])))
+        b4_locations_if([const location_type& l])))[
   {
-    return symbol_type (b4_join([token::b4_symbol([$1], [id])],
-                                b4_symbol_if([$1], [has_type], [v]),
-                                b4_locations_if([l])));
+    symbol_type res (token::]b4_symbol([$1], [id])[]b4_locations_if([, l])[);
+    ]b4_symbol_if([$1], [has_type], [res.value.build (v);])[
+    //    ]b4_locations_if([res.location = l;])[
+    return res;
   }
 
-])])])
+]])])])
 
 
 # b4_symbol_constructor_define