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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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20
data/lalr1.cc
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@@ -296,26 +296,26 @@ m4_define([b4_shared_declarations],
struct by_state
{
/// Default constructor.
by_state ();
by_state () YY_NOEXCEPT;
/// The symbol type as needed by the constructor.
typedef state_type kind_type;
/// Constructor.
by_state (kind_type s);
by_state (kind_type s) YY_NOEXCEPT;
/// Copy constructor.
by_state (const by_state& other);
by_state (const by_state& other) YY_NOEXCEPT;
/// Record that this symbol is empty.
void clear ();
void clear () YY_NOEXCEPT;
/// Steal the symbol type from \a that.
void move (by_state& that);
/// The (internal) type number (corresponding to \a state).
/// \a empty_symbol when empty.
symbol_number_type type_get () const;
symbol_number_type type_get () const YY_NOEXCEPT;
/// The state number used to denote an empty symbol.
enum { empty_state = -1 };
@@ -570,16 +570,16 @@ m4_if(b4_prefix, [yy], [],
]b4_token_ctor_if([], [b4_public_types_define([cc])])[
// by_state.
]b4_parser_class_name[::by_state::by_state ()
]b4_parser_class_name[::by_state::by_state () YY_NOEXCEPT
: state (empty_state)
{}
]b4_parser_class_name[::by_state::by_state (const by_state& other)
]b4_parser_class_name[::by_state::by_state (const by_state& other) YY_NOEXCEPT
: state (other.state)
{}
void
]b4_parser_class_name[::by_state::clear ()
]b4_parser_class_name[::by_state::clear () YY_NOEXCEPT
{
state = empty_state;
}
@@ -591,12 +591,12 @@ m4_if(b4_prefix, [yy], [],
that.clear ();
}
]b4_parser_class_name[::by_state::by_state (state_type s)
]b4_parser_class_name[::by_state::by_state (state_type s) YY_NOEXCEPT
: state (s)
{}
]b4_parser_class_name[::symbol_number_type
]b4_parser_class_name[::by_state::type_get () const
]b4_parser_class_name[::by_state::type_get () const YY_NOEXCEPT
{
if (state == empty_state)
return empty_symbol;