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c++: variants: comparing addresses of typeid.name() is undefined

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Instead of storing and comparing pointers to names of types, store
pointers to the typeids, and compares the typeids.
Reported by Thomas Jahns.
<http://lists.gnu.org/archive/html/bug-bison/2014-03/msg00001.html>

* data/variant.hh (yytname_): Replace with...
(yytypeid_): this.
This commit is contained in:
Akim Demaille
2015-01-07 10:24:53 +01:00
parent 56351d4c7b
commit 7cf84b13a0
2 changed files with 14 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
THANKS
View File

@@ -132,6 +132,7 @@ Steve Murphy murf@parsetree.com
Sum Wu sum@geekhouse.org Sum Wu sum@geekhouse.org
Théophile Ranquet theophile.ranquet@gmail.com Théophile Ranquet theophile.ranquet@gmail.com
Thiru Ramakrishnan thiru.ramakrishnan@gmail.com Thiru Ramakrishnan thiru.ramakrishnan@gmail.com
Thomas Jahns jahns@dkrz.de
Tim Josling tej@melbpc.org.au Tim Josling tej@melbpc.org.au
Tim Landscheidt tim@tim-landscheidt.de Tim Landscheidt tim@tim-landscheidt.de
Tim Van Holder tim.van.holder@pandora.be Tim Van Holder tim.van.holder@pandora.be

26
data/variant.hh
View File

@@ -95,13 +95,13 @@ m4_define([b4_variant_define],
/// Empty construction. /// Empty construction.
variant ()]b4_parse_assert_if([ variant ()]b4_parse_assert_if([
: yytname_ (YY_NULLPTR)])[ : yytypeid_ (YY_NULLPTR)])[
{} {}
/// Construct and fill. /// Construct and fill.
template <typename T> template <typename T>
variant (const T& t)]b4_parse_assert_if([ variant (const T& t)]b4_parse_assert_if([
: yytname_ (typeid (T).name ())])[ : yytypeid_ (&typeid (T))])[
{ {
YYASSERT (sizeof (T) <= S); YYASSERT (sizeof (T) <= S);
new (yyas_<T> ()) T (t); new (yyas_<T> ()) T (t);
@@ -110,7 +110,7 @@ m4_define([b4_variant_define],
/// Destruction, allowed only if empty. /// Destruction, allowed only if empty.
~variant () ~variant ()
{]b4_parse_assert_if([ {]b4_parse_assert_if([
YYASSERT (!yytname_); YYASSERT (!yytypeid_);
])[} ])[}
/// Instantiate an empty \a T in here. /// Instantiate an empty \a T in here.
@@ -118,9 +118,9 @@ m4_define([b4_variant_define],
T& T&
build () build ()
{]b4_parse_assert_if([ {]b4_parse_assert_if([
YYASSERT (!yytname_); YYASSERT (!yytypeid_);
YYASSERT (sizeof (T) <= S); YYASSERT (sizeof (T) <= S);
yytname_ = typeid (T).name ();])[ yytypeid_ = & typeid (T);])[
return *new (yyas_<T> ()) T; return *new (yyas_<T> ()) T;
} }
@@ -129,9 +129,9 @@ m4_define([b4_variant_define],
T& T&
build (const T& t) build (const T& t)
{]b4_parse_assert_if([ {]b4_parse_assert_if([
YYASSERT (!yytname_); YYASSERT (!yytypeid_);
YYASSERT (sizeof (T) <= S); YYASSERT (sizeof (T) <= S);
yytname_ = typeid (T).name ();])[ yytypeid_ = & typeid (T);])[
return *new (yyas_<T> ()) T (t); return *new (yyas_<T> ()) T (t);
} }
@@ -140,7 +140,7 @@ m4_define([b4_variant_define],
T& T&
as () as ()
{]b4_parse_assert_if([ {]b4_parse_assert_if([
YYASSERT (yytname_ == typeid (T).name ()); YYASSERT (*yytypeid_ == typeid (T));
YYASSERT (sizeof (T) <= S);])[ YYASSERT (sizeof (T) <= S);])[
return *yyas_<T> (); return *yyas_<T> ();
} }
@@ -150,7 +150,7 @@ m4_define([b4_variant_define],
const T& const T&
as () const as () const
{]b4_parse_assert_if([ {]b4_parse_assert_if([
YYASSERT (yytname_ == typeid (T).name ()); YYASSERT (*yytypeid_ == typeid (T));
YYASSERT (sizeof (T) <= S);])[ YYASSERT (sizeof (T) <= S);])[
return *yyas_<T> (); return *yyas_<T> ();
} }
@@ -167,8 +167,8 @@ m4_define([b4_variant_define],
void void
swap (self_type& other) swap (self_type& other)
{]b4_parse_assert_if([ {]b4_parse_assert_if([
YYASSERT (yytname_); YYASSERT (yytypeid_);
YYASSERT (yytname_ == other.yytname_);])[ YYASSERT (*yytypeid_ == *other.yytypeid_);])[
std::swap (as<T> (), other.as<T> ()); std::swap (as<T> (), other.as<T> ());
} }
@@ -198,7 +198,7 @@ m4_define([b4_variant_define],
destroy () destroy ()
{ {
as<T> ().~T ();]b4_parse_assert_if([ as<T> ().~T ();]b4_parse_assert_if([
yytname_ = YY_NULLPTR;])[ yytypeid_ = YY_NULLPTR;])[
} }
private: private:
@@ -233,7 +233,7 @@ m4_define([b4_variant_define],
} yybuffer_;]b4_parse_assert_if([ } yybuffer_;]b4_parse_assert_if([
/// Whether the content is built: if defined, the name of the stored type. /// Whether the content is built: if defined, the name of the stored type.
const char *yytname_;])[ const std::type_info *yytypeid_;])[
}; };
]]) ]])