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Don't memcpy C++ structures.

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* data/lalr1-fusion.cc (b4_symbol_variant): Adjust additional
	arguments.
	(variant::build): New overload for
	copy-construction-that-destroys.
	(variant::swap): New.
	(parser::yypush_): Use it in variant mode.
This commit is contained in:
Akim Demaille
2008-07-21 22:02:36 +02:00
parent ef05c4d6f9
commit 4af4348a3f
2 changed files with 35 additions and 4 deletions
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10
ChangeLog
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@@ -1,3 +1,13 @@
2008-11-04 Akim Demaille <demaille@gostai.com>
Don't memcpy C++ structures.
* data/lalr1-fusion.cc (b4_symbol_variant): Adjust additional
arguments.
(variant::build): New overload for
copy-construction-that-destroys.
(variant::swap): New.
(parser::yypush_): Use it in variant mode.
2008-11-04 Akim Demaille <demaille@gostai.com>
Better defaults for bench.pl.

29
data/lalr1-fusion.cc
View File

@@ -85,13 +85,13 @@ m4_define([b4_symbol_action_],
])])
# b4_symbol_variant(YYTYPE, YYVAL, ACTION)
# ----------------------------------------
# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
# ------------------------------------------------
# Run some ACTION ("build", or "destroy") on YYVAL of symbol type
# YYTYPE.
m4_define([b4_symbol_variant],
[m4_pushdef([b4_dollar_dollar],
[$2.$3<$][3>()])dnl
[$2.$3<$][3>(m4_shift3($@))])dnl
switch ($1)
{
m4_map([b4_symbol_action_], m4_defn([b4_type_names]))
@@ -202,6 +202,24 @@ dnl FIXME: This is wrong, we want computed header guards.
return reinterpret_cast<const T&>(buffer);
}
/// Swap the content with \a other.
template <typename T>
inline void
swap(variant<S>& other)
{
std::swap(as<T>(), other.as<T>());
}
/// Assign the content of \a other to this.
/// Destroys \a other.
template <typename T>
inline void
build(variant<S>& other)
{
build<T>();
swap<T>(other);
}
/// Destroy the stored \a T.
template <typename T>
inline void
@@ -683,7 +701,10 @@ do { \
]b4_parser_class_name[::yypush_ (state_type s,
semantic_type& v, const location_type& l)
{
yystack_.push (data_type (s, v, l));
]b4_variant_if(
[[ yystack_.push (data_type (s, semantic_type(), l));
]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]], [build], [v])],
[ yystack_.push (data_type (s, v, l));])[
}
void