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C++: use noexcept and constexpr

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There are probably more opportunities for them.
So far, I observed no performance improvements.

* data/c++.m4, data/lalr1.cc, data/stack.hh: here.
This commit is contained in:
Akim Demaille
2018-11-12 18:35:21 +01:00
parent cc422ce677
commit 6ef788f810
5 changed files with 49 additions and 28 deletions
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26
data/c++.m4
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@@ -72,6 +72,20 @@ m4_define([b4_cxx_portability],
# define YY_MOVE_REF(Type) Type&
# define YY_RVREF(Type) const Type&
# define YY_COPY(Type) const Type&
#endif
// Support noexcept when possible.
#if 201103L <= YY_CPLUSPLUS
# define YY_NOEXCEPT noexcept
#else
# define YY_NOEXCEPT
#endif[]dnl
// Support noexcept when possible.
#if 201703 <= YY_CPLUSPLUS
# define YY_CONSTEXPR constexpr
#else
# define YY_CONSTEXPR
#endif[]dnl
])
@@ -266,7 +280,7 @@ m4_define([b4_symbol_type_declare],
void clear ();
/// Whether empty.
bool empty () const;
bool empty () const YY_NOEXCEPT;
/// Destructive move, \a s is emptied into this.
void move (basic_symbol& s);
@@ -307,10 +321,10 @@ m4_define([b4_symbol_type_declare],
/// The (internal) type number (corresponding to \a type).
/// \a empty when empty.
symbol_number_type type_get () const;
symbol_number_type type_get () const YY_NOEXCEPT;
/// The token.
token_type token () const;
token_type token () const YY_NOEXCEPT;
/// The symbol type.
/// \a empty_symbol when empty.
@@ -402,7 +416,7 @@ m4_define([b4_public_types_define],
template <typename Base>
bool
]b4_parser_class_name[::basic_symbol<Base>::empty () const
]b4_parser_class_name[::basic_symbol<Base>::empty () const YY_NOEXCEPT
{
return Base::type_get () == empty_symbol;
}
@@ -445,13 +459,13 @@ m4_define([b4_public_types_define],
}
]b4_inline([$1])[int
]b4_parser_class_name[::by_type::type_get () const
]b4_parser_class_name[::by_type::type_get () const YY_NOEXCEPT
{
return type;
}
]b4_token_ctor_if([[
]b4_inline([$1])b4_parser_class_name[::token_type
]b4_parser_class_name[::by_type::token () const
]b4_parser_class_name[::by_type::token () const YY_NOEXCEPT
{
// YYTOKNUM[NUM] -- (External) token number corresponding to the
// (internal) symbol number NUM (which must be that of a token). */