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c++: factor the handling of __cplusplus into YY_CPLUSPLUS

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* data/c++.m4 (b4_cxx_portability): Define it.
Use it.
* data/lalr1.cc, data/variant.hh: Use it.
This commit is contained in:
Akim Demaille
2018-11-13 06:49:24 +01:00
parent a52723e3e8
commit 7adeb80765
4 changed files with 16 additions and 9 deletions
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10
data/c++.m4
View File

@@ -53,8 +53,14 @@ m4_define([b4_inline],
# b4_cxx_portability
# ------------------
m4_define([b4_cxx_portability],
[// Support move semantics when possible.
#if defined __cplusplus && 201103L <= __cplusplus
[#if defined __cplusplus
# define YY_CPLUSPLUS __cplusplus
#else
# define YY_CPLUSPLUS 199711L
#endif
// Support move semantics when possible.
#if 201103L <= YY_CPLUSPLUS
# define YY_MOVE std::move
# define YY_MOVE_OR_COPY move
# define YY_MOVE_REF(Type) Type&&

8
data/lalr1.cc
View File

@@ -336,7 +336,7 @@ m4_define([b4_shared_declarations],
stack_symbol_type (YY_RVREF (stack_symbol_type) that);
/// Steal the contents from \a sym to build this.
stack_symbol_type (state_type s, YY_MOVE_REF (symbol_type) sym);
#if !defined __cplusplus || __cplusplus < 201103L
#if YY_CPLUSPLUS < 201103L
/// Assignment, needed by push_back by some old implementations.
/// Moves the contents of that.
stack_symbol_type& operator= (stack_symbol_type& that);
@@ -612,7 +612,7 @@ m4_if(b4_prefix, [yy], [],
{]b4_variant_if([
b4_symbol_variant([that.type_get ()],
[value], [YY_MOVE_OR_COPY], [YY_MOVE (that.value)])])[
#if defined __cplusplus && 201103L <= __cplusplus
#if 201103L <= YY_CPLUSPLUS
// that is emptied.
that.state = empty_state;
#endif
@@ -627,7 +627,7 @@ m4_if(b4_prefix, [yy], [],
that.type = empty_symbol;
}
#if !defined __cplusplus || __cplusplus < 201103L
#if YY_CPLUSPLUS < 201103L
]b4_parser_class_name[::stack_symbol_type&
]b4_parser_class_name[::stack_symbol_type::operator= (stack_symbol_type& that)
{
@@ -685,7 +685,7 @@ m4_if(b4_prefix, [yy], [],
void
]b4_parser_class_name[::yypush_ (const char* m, state_type s, YY_MOVE_REF (symbol_type) sym)
{
#if defined __cplusplus && 201103L <= __cplusplus
#if 201103L <= YY_CPLUSPLUS
yypush_ (m, stack_symbol_type (s, std::move (sym)));
#else
stack_symbol_type ss (s, sym);

6
data/variant.hh
View File

@@ -125,7 +125,7 @@ m4_define([b4_variant_define],
return *new (yyas_<T> ()) T ();
}
# if defined __cplusplus && 201103L <= __cplusplus
# if 201103L <= YY_CPLUSPLUS
/// Instantiate a \a T in here from \a t.
template <typename T, typename U>
T&
@@ -213,7 +213,7 @@ m4_define([b4_variant_define],
void
move (self_type& other)
{
# if defined __cplusplus && 201103L <= __cplusplus
# if 201103L <= YY_CPLUSPLUS
emplace<T> (std::move (other.as<T> ()));
# else
emplace<T> ();
@@ -222,7 +222,7 @@ m4_define([b4_variant_define],
other.destroy<T> ();
}
# if defined __cplusplus && 201103L <= __cplusplus
# if 201103L <= YY_CPLUSPLUS
/// Move the content of \a other to this.
template <typename T>
void

1
tests/headers.at
View File

@@ -317,6 +317,7 @@ AT_CHECK([[$PERL -n -0777 -e '
|YYUSE
|YY_ATTRIBUTE(?:_PURE|_UNUSED)?
|YY_COPY
|YY_CPLUSPLUS
|YY_IGNORE_MAYBE_UNINITIALIZED_(?:BEGIN|END)
|YY_INITIAL_VALUE
|YY_MOVE