builtin.h
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上传日期:2007-01-06
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文件大小:3k
- // This may look like C code, but it is really -*- C++ -*-
- /*
- Copyright (C) 1988, 1992 Free Software Foundation
- written by Doug Lea (dl@rocky.oswego.edu)
- This file is part of the GNU C++ Library. This library is free
- software; you can redistribute it and/or modify it under the terms of
- the GNU Library General Public License as published by the Free
- Software Foundation; either version 2 of the License, or (at your
- option) any later version. This library is distributed in the hope
- that it will be useful, but WITHOUT ANY WARRANTY; without even the
- implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
- PURPOSE. See the GNU Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- arithmetic, etc. functions on built in types
- */
- #ifndef _builtin_h
- #ifdef __GNUG__
- #pragma interface
- #endif
- #define _builtin_h 1
- #include <stddef.h>
- #include <unistd.h>
- #include <math.h>
- #ifdef __GNUG__
- #define _VOLATILE_VOID volatile void
- #else
- #define _VOLATILE_VOID void
- #endif
- typedef void (*one_arg_error_handler_t)(const char*);
- typedef void (*two_arg_error_handler_t)(const char*, const char*);
- long gcd(long, long);
- long lg(unsigned long);
- double pow(double, long);
- long pow(long, long);
- extern "C" double start_timer();
- extern "C" double return_elapsed_time(double last_time = 0.0);
- char* dtoa(double x, char cvt = 'g', int width = 0, int prec = 6);
- unsigned int hashpjw(const char*);
- unsigned int multiplicativehash(int);
- unsigned int foldhash(double);
- extern _VOLATILE_VOID default_one_arg_error_handler(const char*);
- extern _VOLATILE_VOID default_two_arg_error_handler(const char*, const char*);
- extern two_arg_error_handler_t lib_error_handler;
- extern two_arg_error_handler_t
- set_lib_error_handler(two_arg_error_handler_t f);
- #if !defined(IV)
- #if ! _G_MATH_H_INLINES /* hpux and SCO define this in math.h */
- inline double abs(double arg)
- {
- return (arg < 0.0)? -arg : arg;
- }
- #endif
- inline float abs(float arg)
- {
- return (arg < 0.0)? -arg : arg;
- }
- inline short abs(short arg)
- {
- return (arg < 0)? -arg : arg;
- }
- #ifndef LINUX
- inline long abs(long arg)
- {
- return (arg < 0)? -arg : arg;
- }
- #endif
- inline int sign(long arg)
- {
- return (arg == 0) ? 0 : ( (arg > 0) ? 1 : -1 );
- }
- inline int sign(double arg)
- {
- return (arg == 0.0) ? 0 : ( (arg > 0.0) ? 1 : -1 );
- }
- inline long sqr(long arg)
- {
- return arg * arg;
- }
- #if ! _G_MATH_H_INLINES /* hpux and SCO define this in math.h */
- inline double sqr(double arg)
- {
- return arg * arg;
- }
- #endif
- inline int even(long arg)
- {
- return !(arg & 1);
- }
- inline int odd(long arg)
- {
- return (arg & 1);
- }
- inline long lcm(long x, long y)
- {
- return x / gcd(x, y) * y;
- }
- inline void (setbit)(long& x, long b)
- {
- x |= (1 << b);
- }
- inline void clearbit(long& x, long b)
- {
- x &= ~(1 << b);
- }
- inline int testbit(long x, long b)
- {
- return ((x & (1 << b)) != 0);
- }
- #endif
- #endif