build: restore C90 compatibility

[bison.git] / data / variant.hh

diff --git a/data/variant.hh b/data/variant.hh
index 3b21329c01a2e0dcd5f43c0f87fd1e4197580b4f..91548d849b49e79cc6d0cef5d3c70d1d7916498d 100644 (file)
--- a/data/variant.hh
+++ b/data/variant.hh
@@ -95,15 +95,13 @@ m4_define([b4_variant_define],
 
     /// Empty construction.
     variant ()]b4_parse_assert_if([
-      : built (false)
-      , tname (YY_NULL)])[
+      : tname (YY_NULL)])[
     {}
 
     /// Construct and fill.
     template <typename T>
     variant (const T& t)]b4_parse_assert_if([
-      : built (true)
-      , tname (typeid (T).name ())])[
+      : tname (typeid (T).name ())])[
     {
       YYASSERT (sizeof (T) <= S);
       new (buffer.raw) T (t);
@@ -112,7 +110,7 @@ m4_define([b4_variant_define],
     /// Destruction, allowed only if empty.
     ~variant ()
     {]b4_parse_assert_if([
-      YYASSERT (!built);
+      YYASSERT (!tname);
     ])[}
 
     /// Instantiate an empty \a T in here.
@@ -120,10 +118,8 @@ m4_define([b4_variant_define],
     T&
     build ()
     {]b4_parse_assert_if([
-      YYASSERT (!built);
       YYASSERT (!tname);
       YYASSERT (sizeof (T) <= S);
-      built = true;
       tname = typeid (T).name ();])[
       return *new (buffer.raw) T;
     }
@@ -133,10 +129,8 @@ m4_define([b4_variant_define],
     T&
     build (const T& t)
     {]b4_parse_assert_if([
-      YYASSERT (!built);
       YYASSERT (!tname);
       YYASSERT (sizeof (T) <= S);
-      built = true;
       tname = typeid (T).name ();])[
       return *new (buffer.raw) T (t);
     }
@@ -146,10 +140,12 @@ m4_define([b4_variant_define],
     T&
     as ()
     {]b4_parse_assert_if([
-      YYASSERT (built);
       YYASSERT (tname == typeid (T).name ());
       YYASSERT (sizeof (T) <= S);])[
-      return reinterpret_cast<T&> (buffer.raw);
+      {
+        void *dummy = buffer.raw;
+        return *static_cast<T*> (dummy);
+      }
     }
 
     /// Const accessor to a built \a T (for %printer).
@@ -157,10 +153,12 @@ m4_define([b4_variant_define],
     const T&
     as () const
     {]b4_parse_assert_if([
-      YYASSERT (built);
       YYASSERT (tname == typeid (T).name ());
       YYASSERT (sizeof (T) <= S);])[
-      return reinterpret_cast<const T&> (buffer.raw);
+      {
+        const void *dummy = buffer.raw;
+        return *static_cast<const T*> (dummy);
+      }
     }
 
     /// Swap the content with \a other, of same type.
@@ -175,8 +173,7 @@ m4_define([b4_variant_define],
     void
     swap (self_type& other)
     {]b4_parse_assert_if([
-      YYASSERT (built);
-      YYASSERT (other.built);
+      YYASSERT (tname);
       YYASSERT (tname == other.tname);])[
       std::swap (as<T>(), other.as<T>());
     }
@@ -188,7 +185,7 @@ m4_define([b4_variant_define],
     void
     move (self_type& other)
     {]b4_parse_assert_if([
-      YYASSERT (! built);])[
+      YYASSERT (!tname);])[
       build<T>();
       swap<T>(other);
       other.destroy<T>();
@@ -208,7 +205,6 @@ m4_define([b4_variant_define],
     destroy ()
     {
       as<T> ().~T ();]b4_parse_assert_if([
-      built = false;
       tname = YY_NULL;])[
     }
 
@@ -226,10 +222,8 @@ m4_define([b4_variant_define],
       char raw[S];
     } buffer;]b4_parse_assert_if([
 
-    /// Whether the content is built.
-    bool built;
-    /// If defined, the name of the stored type.
-    const char* tname;])[
+    /// Whether the content is built: if defined, the name of the stored type.
+    const char *tname;])[
   };
 ]])