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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
#ifndef RUBY3_RSTRUCT_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY3_RSTRUCT_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RUBY3` or `ruby3` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Routines to manipulate struct ::RStruct.
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*/
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#include "ruby/3/attr/artificial.h"
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#include "ruby/3/dllexport.h"
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#include "ruby/3/value.h"
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#include "ruby/3/value_type.h"
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#include "ruby/3/arithmetic/long.h"
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#include "ruby/3/arithmetic/int.h"
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#if !defined RUBY_EXPORT && !defined RUBY_NO_OLD_COMPATIBILITY
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# include "ruby/backward.h"
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#endif
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#define RSTRUCT_PTR(st) rb_struct_ptr(st)
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/** @cond INTERNAL_MACRO */
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#define RSTRUCT_LEN RSTRUCT_LEN
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#define RSTRUCT_SET RSTRUCT_SET
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#define RSTRUCT_GET RSTRUCT_GET
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/** @endcond */
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RUBY3_SYMBOL_EXPORT_BEGIN()
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VALUE rb_struct_size(VALUE s);
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VALUE rb_struct_aref(VALUE, VALUE);
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VALUE rb_struct_aset(VALUE, VALUE, VALUE);
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RUBY3_SYMBOL_EXPORT_END()
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RUBY3_ATTR_ARTIFICIAL()
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static inline long
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RSTRUCT_LEN(VALUE st)
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{
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RUBY3_ASSERT_TYPE(st, RUBY_T_STRUCT);
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return RB_NUM2LONG(rb_struct_size(st));
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}
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RUBY3_ATTR_ARTIFICIAL()
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static inline VALUE
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RSTRUCT_SET(VALUE st, int k, VALUE v)
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{
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RUBY3_ASSERT_TYPE(st, RUBY_T_STRUCT);
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return rb_struct_aset(st, INT2NUM(k), (v));
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}
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RUBY3_ATTR_ARTIFICIAL()
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static inline VALUE
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RSTRUCT_GET(VALUE st, int k)
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{
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RUBY3_ASSERT_TYPE(st, RUBY_T_STRUCT);
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return rb_struct_aref(st, INT2NUM(k));
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}
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#endif /* RUBY3_RSTRUCT_H */
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