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C++: support variadic emplace

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Suggested by Askar Safin.
http://lists.gnu.org/archive/html/bug-bison/2018-12/msg00006.html

* data/variant.hh: Implement.
* tests/types.at: Check.
* doc/bison.texi: Document.
This commit is contained in:
Akim Demaille
2018-12-10 17:41:24 +01:00
parent d657da9fb4
commit 81dbd0d82e
4 changed files with 42 additions and 28 deletions
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24
data/variant.hh
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@@ -121,6 +121,18 @@ m4_define([b4_value_type_declare],
YYASSERT (!yytypeid_);
])[}
# if 201103L <= YY_CPLUSPLUS
/// Instantiate a \a T in here from \a t.
template <typename T, typename... U>
T&
emplace (U&&... u)
{]b4_parse_assert_if([
YYASSERT (!yytypeid_);
YYASSERT (sizeof (T) <= size);
yytypeid_ = & typeid (T);])[
return *new (yyas_<T> ()) T (std::forward <U>(u)...);
}
# else
/// Instantiate an empty \a T in here.
template <typename T>
T&
@@ -132,18 +144,6 @@ m4_define([b4_value_type_declare],
return *new (yyas_<T> ()) T ();
}
# if 201103L <= YY_CPLUSPLUS
/// Instantiate a \a T in here from \a t.
template <typename T, typename U>
T&
emplace (U&& u)
{]b4_parse_assert_if([
YYASSERT (!yytypeid_);
YYASSERT (sizeof (T) <= size);
yytypeid_ = & typeid (T);])[
return *new (yyas_<T> ()) T (std::forward <U>(u));
}
# else
/// Instantiate a \a T in here from \a t.
template <typename T>
T&