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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
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
#ifndef INTERNAL_RATIONAL_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_RATIONAL_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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* @brief Internal header for Rational.
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*/
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#include "ruby/3/config.h" /* for HAVE_LIBGMP */
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#include "ruby/ruby.h" /* for struct RBasic */
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#include "internal/gc.h" /* for RB_OBJ_WRITE */
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#include "internal/numeric.h" /* for INT_POSITIVE_P */
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#include "ruby_assert.h" /* for assert */
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struct RRational {
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struct RBasic basic;
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VALUE num;
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VALUE den;
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};
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#define RRATIONAL(obj) (R_CAST(RRational)(obj))
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/* rational.c */
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VALUE rb_rational_canonicalize(VALUE x);
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VALUE rb_rational_uminus(VALUE self);
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VALUE rb_rational_plus(VALUE self, VALUE other);
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VALUE rb_rational_mul(VALUE self, VALUE other);
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VALUE rb_lcm(VALUE x, VALUE y);
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VALUE rb_rational_reciprocal(VALUE x);
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VALUE rb_cstr_to_rat(const char *, int);
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VALUE rb_rational_abs(VALUE self);
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VALUE rb_rational_cmp(VALUE self, VALUE other);
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VALUE rb_rational_pow(VALUE self, VALUE other);
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VALUE rb_numeric_quo(VALUE x, VALUE y);
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VALUE rb_float_numerator(VALUE x);
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VALUE rb_float_denominator(VALUE x);
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static inline void RATIONAL_SET_NUM(VALUE r, VALUE n);
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static inline void RATIONAL_SET_DEN(VALUE r, VALUE d);
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RUBY_SYMBOL_EXPORT_BEGIN
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/* rational.c (export) */
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VALUE rb_gcd(VALUE x, VALUE y);
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VALUE rb_gcd_normal(VALUE self, VALUE other);
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#if defined(HAVE_LIBGMP) && defined(HAVE_GMP_H)
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VALUE rb_gcd_gmp(VALUE x, VALUE y);
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#endif
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RUBY_SYMBOL_EXPORT_END
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static inline void
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RATIONAL_SET_NUM(VALUE r, VALUE n)
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{
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assert(RB_INTEGER_TYPE_P(n));
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RB_OBJ_WRITE(r, &RRATIONAL(r)->num, n);
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}
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static inline void
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RATIONAL_SET_DEN(VALUE r, VALUE d)
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{
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assert(RB_INTEGER_TYPE_P(d));
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assert(INT_POSITIVE_P(d));
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RB_OBJ_WRITE(r, &RRATIONAL(r)->den, d);
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}
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#endif /* INTERNAL_RATIONAL_H */
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