Future/bison
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/bison.git synced 2026-03-09 12:23:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Théophile Ranquet theophile.ranquet@gmail.com
Thiru Ramakrishnan thiru.ramakrishnan@gmail.com
Thomas Jahns jahns@dkrz.de
Tim Josling tej@melbpc.org.au
Tim Landscheidt tim@tim-landscheidt.de
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.
variant ()]b4_parse_assert_if([
: yytname_ (YY_NULLPTR)])[
: yytypeid_ (YY_NULLPTR)])[
{}
/// Construct and fill.
template <typename T>
variant (const T& t)]b4_parse_assert_if([
: yytname_ (typeid (T).name ())])[
: yytypeid_ (&typeid (T))])[
{
YYASSERT (sizeof (T) <= S);
new (yyas_<T> ()) T (t);
@@ -110,7 +110,7 @@ m4_define([b4_variant_define],
/// Destruction, allowed only if empty.
~variant ()
{]b4_parse_assert_if([
YYASSERT (!yytname_);
YYASSERT (!yytypeid_);
])[}
/// Instantiate an empty \a T in here.
@@ -118,9 +118,9 @@ m4_define([b4_variant_define],
T&
build ()
{]b4_parse_assert_if([
YYASSERT (!yytname_);
YYASSERT (!yytypeid_);
YYASSERT (sizeof (T) <= S);
yytname_ = typeid (T).name ();])[
yytypeid_ = & typeid (T);])[
return *new (yyas_<T> ()) T;
}
@@ -129,9 +129,9 @@ m4_define([b4_variant_define],
T&
build (const T& t)
{]b4_parse_assert_if([
YYASSERT (!yytname_);
YYASSERT (!yytypeid_);
YYASSERT (sizeof (T) <= S);
yytname_ = typeid (T).name ();])[
yytypeid_ = & typeid (T);])[
return *new (yyas_<T> ()) T (t);
}
@@ -140,7 +140,7 @@ m4_define([b4_variant_define],
T&
as ()
{]b4_parse_assert_if([
YYASSERT (yytname_ == typeid (T).name ());
YYASSERT (*yytypeid_ == typeid (T));
YYASSERT (sizeof (T) <= S);])[
return *yyas_<T> ();
}
@@ -150,7 +150,7 @@ m4_define([b4_variant_define],
const T&
as () const
{]b4_parse_assert_if([
YYASSERT (yytname_ == typeid (T).name ());
YYASSERT (*yytypeid_ == typeid (T));
YYASSERT (sizeof (T) <= S);])[
return *yyas_<T> ();
}
@@ -167,8 +167,8 @@ m4_define([b4_variant_define],
void
swap (self_type& other)
{]b4_parse_assert_if([
YYASSERT (yytname_);
YYASSERT (yytname_ == other.yytname_);])[
YYASSERT (yytypeid_);
YYASSERT (*yytypeid_ == *other.yytypeid_);])[
std::swap (as<T> (), other.as<T> ());
}
@@ -198,7 +198,7 @@ m4_define([b4_variant_define],
destroy ()
{
as<T> ().~T ();]b4_parse_assert_if([
yytname_ = YY_NULLPTR;])[
yytypeid_ = YY_NULLPTR;])[
}
private:
@@ -233,7 +233,7 @@ m4_define([b4_variant_define],
} yybuffer_;]b4_parse_assert_if([
/// Whether the content is built: if defined, the name of the stored type.
const char *yytname_;])[
const std::type_info *yytypeid_;])[
};
]])