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variants: prohibit simple copies

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The "variant" structure provides a means to store, in a typeless way,
C++ objects.  Manipulating it without provide the type of the stored
content is doomed to failure.  So provide a means to copy in a type
safe way, and prohibit typeless assignments.

* data/c++.m4 (symbol_type::move): New.
* data/lalr1.cc: Use it.
* data/variant.hh (b4_variant_define): Provide variant::copy.
Let variant::operator= abort.
We cannot undefine it, yet, as it is still uses by the implicit
assigment in symbols, which must also be disabled.
This commit is contained in:
Akim Demaille
2012-12-19 10:18:03 +01:00
parent 35f70d169f
commit 7be08dfbe7
3 changed files with 35 additions and 4 deletions
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9
data/lalr1.cc
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@@ -721,10 +721,11 @@ b4_dollar_popdef])[]dnl
try
{
]b4_token_ctor_if(
[ yyla = b4_function_call([yylex], [symbol_type],
m4_ifdef([b4_lex_param], b4_lex_param));],
[ yyla.type = yytranslate_ (b4_function_call([yylex], [int],
[b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl
[ symbol_type yylookahead = b4_function_call([yylex], [symbol_type],
m4_ifdef([b4_lex_param], b4_lex_param));
yyla.move(yylookahead);],
[ yyla.type = yytranslate_ (b4_function_call([yylex], [int],
[b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl
b4_locations_if([, [[location*], [&yyla.location]]])dnl
m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
}