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darling-libcxx/include/ratio
Howard Hinnant 9996844df0 Further macro protection by replacing _[A-Z] with _[A-Z]p 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@145410 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-29 18:15:50 +00:00

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// -*- C++ -*-
//===---------------------------- ratio -----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_RATIO
#define _LIBCPP_RATIO
/*
ratio synopsis
namespace std
{
template <intmax_t N, intmax_t D = 1>
class ratio
{
public:
static const intmax_t num;
static const intmax_t den;
typedef ratio<num, den> type;
};
// ratio arithmetic
template <class R1, class R2> using ratio_add = ...;
template <class R1, class R2> using ratio_subtract = ...;
template <class R1, class R2> using ratio_multiply = ...;
template <class R1, class R2> using ratio_divide = ...;
// ratio comparison
template <class R1, class R2> struct ratio_equal;
template <class R1, class R2> struct ratio_not_equal;
template <class R1, class R2> struct ratio_less;
template <class R1, class R2> struct ratio_less_equal;
template <class R1, class R2> struct ratio_greater;
template <class R1, class R2> struct ratio_greater_equal;
// convenience SI typedefs
typedef ratio<1, 1000000000000000000000000> yocto; // not supported
typedef ratio<1, 1000000000000000000000> zepto; // not supported
typedef ratio<1, 1000000000000000000> atto;
typedef ratio<1, 1000000000000000> femto;
typedef ratio<1, 1000000000000> pico;
typedef ratio<1, 1000000000> nano;
typedef ratio<1, 1000000> micro;
typedef ratio<1, 1000> milli;
typedef ratio<1, 100> centi;
typedef ratio<1, 10> deci;
typedef ratio< 10, 1> deca;
typedef ratio< 100, 1> hecto;
typedef ratio< 1000, 1> kilo;
typedef ratio< 1000000, 1> mega;
typedef ratio< 1000000000, 1> giga;
typedef ratio< 1000000000000, 1> tera;
typedef ratio< 1000000000000000, 1> peta;
typedef ratio< 1000000000000000000, 1> exa;
typedef ratio< 1000000000000000000000, 1> zetta; // not supported
typedef ratio<1000000000000000000000000, 1> yotta; // not supported
}
*/
#include <__config>
#include <cstdint>
#include <climits>
#include <type_traits>
#include <__undef_min_max>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
// __static_gcd
template <intmax_t _Xp, intmax_t _Yp>
struct __static_gcd
{
static const intmax_t value = __static_gcd<_Yp, _Xp % _Yp>::value;
};
template <intmax_t _Xp>
struct __static_gcd<_Xp, 0>
{
static const intmax_t value = _Xp;
};
template <>
struct __static_gcd<0, 0>
{
static const intmax_t value = 1;
};
// __static_lcm
template <intmax_t _Xp, intmax_t _Yp>
struct __static_lcm
{
static const intmax_t value = _Xp / __static_gcd<_Xp, _Yp>::value * _Yp;
};
template <intmax_t _Xp>
struct __static_abs
{
static const intmax_t value = _Xp < 0 ? -_Xp : _Xp;
};
template <intmax_t _Xp>
struct __static_sign
{
static const intmax_t value = _Xp == 0 ? 0 : (_Xp < 0 ? -1 : 1);
};
template <intmax_t _Xp, intmax_t _Yp, intmax_t = __static_sign<_Yp>::value>
class __ll_add;
template <intmax_t _Xp, intmax_t _Yp>
class __ll_add<_Xp, _Yp, 1>
{
static const intmax_t min = (1LL << (sizeof(intmax_t) * CHAR_BIT - 1)) + 1;
static const intmax_t max = -min;
static_assert(_Xp <= max - _Yp, "overflow in __ll_add");
public:
static const intmax_t value = _Xp + _Yp;
};
template <intmax_t _Xp, intmax_t _Yp>
class __ll_add<_Xp, _Yp, 0>
{
public:
static const intmax_t value = _Xp;
};
template <intmax_t _Xp, intmax_t _Yp>
class __ll_add<_Xp, _Yp, -1>
{
static const intmax_t min = (1LL << (sizeof(intmax_t) * CHAR_BIT - 1)) + 1;
static const intmax_t max = -min;
static_assert(min - _Yp <= _Xp, "overflow in __ll_add");
public:
static const intmax_t value = _Xp + _Yp;
};
template <intmax_t _Xp, intmax_t _Yp, intmax_t = __static_sign<_Yp>::value>
class __ll_sub;
template <intmax_t _Xp, intmax_t _Yp>
class __ll_sub<_Xp, _Yp, 1>
{
static const intmax_t min = (1LL << (sizeof(intmax_t) * CHAR_BIT - 1)) + 1;
static const intmax_t max = -min;
static_assert(min + _Yp <= _Xp, "overflow in __ll_sub");
public:
static const intmax_t value = _Xp - _Yp;
};
template <intmax_t _Xp, intmax_t _Yp>
class __ll_sub<_Xp, _Yp, 0>
{
public:
static const intmax_t value = _Xp;
};
template <intmax_t _Xp, intmax_t _Yp>
class __ll_sub<_Xp, _Yp, -1>
{
static const intmax_t min = (1LL << (sizeof(intmax_t) * CHAR_BIT - 1)) + 1;
static const intmax_t max = -min;
static_assert(_Xp <= max + _Yp, "overflow in __ll_sub");
public:
static const intmax_t value = _Xp - _Yp;
};
template <intmax_t _Xp, intmax_t _Yp>
class __ll_mul
{
static const intmax_t nan = (1LL << (sizeof(intmax_t) * CHAR_BIT - 1));
static const intmax_t min = nan + 1;
static const intmax_t max = -min;
static const intmax_t __a_x = __static_abs<_Xp>::value;
static const intmax_t __a_y = __static_abs<_Yp>::value;
static_assert(_Xp != nan && _Yp != nan && __a_x <= max / __a_y, "overflow in __ll_mul");
public:
static const intmax_t value = _Xp * _Yp;
};
template <intmax_t _Yp>
class __ll_mul<0, _Yp>
{
public:
static const intmax_t value = 0;
};
template <intmax_t _Xp>
class __ll_mul<_Xp, 0>
{
public:
static const intmax_t value = 0;
};
template <>
class __ll_mul<0, 0>
{
public:
static const intmax_t value = 0;
};
// Not actually used but left here in case needed in future maintenance
template <intmax_t _Xp, intmax_t _Yp>
class __ll_div
{
static const intmax_t nan = (1LL << (sizeof(intmax_t) * CHAR_BIT - 1));
static const intmax_t min = nan + 1;
static const intmax_t max = -min;
static_assert(_Xp != nan && _Yp != nan && _Yp != 0, "overflow in __ll_div");
public:
static const intmax_t value = _Xp / _Yp;
};
template <intmax_t _Num, intmax_t _Den = 1>
class _LIBCPP_VISIBLE ratio
{
static_assert(__static_abs<_Num>::value >= 0, "ratio numerator is out of range");
static_assert(_Den != 0, "ratio divide by 0");
static_assert(__static_abs<_Den>::value > 0, "ratio denominator is out of range");
static const intmax_t __na = __static_abs<_Num>::value;
static const intmax_t __da = __static_abs<_Den>::value;
static const intmax_t __s = __static_sign<_Num>::value * __static_sign<_Den>::value;
static const intmax_t __gcd = __static_gcd<__na, __da>::value;
public:
static const intmax_t num = __s * __na / __gcd;
static const intmax_t den = __da / __gcd;
typedef ratio<num, den> type;
};
template <intmax_t _Num, intmax_t _Den> const intmax_t ratio<_Num, _Den>::num;
template <intmax_t _Num, intmax_t _Den> const intmax_t ratio<_Num, _Den>::den;
template <class _Tp> struct __is_ratio : false_type {};
template <intmax_t _Num, intmax_t _Den> struct __is_ratio<ratio<_Num, _Den> > : true_type {};
typedef ratio<1LL, 1000000000000000000LL> atto;
typedef ratio<1LL, 1000000000000000LL> femto;
typedef ratio<1LL, 1000000000000LL> pico;
typedef ratio<1LL, 1000000000LL> nano;
typedef ratio<1LL, 1000000LL> micro;
typedef ratio<1LL, 1000LL> milli;
typedef ratio<1LL, 100LL> centi;
typedef ratio<1LL, 10LL> deci;
typedef ratio< 10LL, 1LL> deca;
typedef ratio< 100LL, 1LL> hecto;
typedef ratio< 1000LL, 1LL> kilo;
typedef ratio< 1000000LL, 1LL> mega;
typedef ratio< 1000000000LL, 1LL> giga;
typedef ratio< 1000000000000LL, 1LL> tera;
typedef ratio< 1000000000000000LL, 1LL> peta;
typedef ratio<1000000000000000000LL, 1LL> exa;
template <class _R1, class _R2>
struct __ratio_multiply
{
private:
static const intmax_t __gcd_n1_d2 = __static_gcd<_R1::num, _R2::den>::value;
static const intmax_t __gcd_d1_n2 = __static_gcd<_R1::den, _R2::num>::value;
public:
typedef typename ratio
<
__ll_mul<_R1::num / __gcd_n1_d2, _R2::num / __gcd_d1_n2>::value,
__ll_mul<_R2::den / __gcd_n1_d2, _R1::den / __gcd_d1_n2>::value
>::type type;
};
#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2> using ratio_multiply
= typename __ratio_multiply<_R1, _R2>::type;
#else // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_multiply
: public __ratio_multiply<_R1, _R2>::type {};
#endif // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2>
struct __ratio_divide
{
private:
static const intmax_t __gcd_n1_n2 = __static_gcd<_R1::num, _R2::num>::value;
static const intmax_t __gcd_d1_d2 = __static_gcd<_R1::den, _R2::den>::value;
public:
typedef typename ratio
<
__ll_mul<_R1::num / __gcd_n1_n2, _R2::den / __gcd_d1_d2>::value,
__ll_mul<_R2::num / __gcd_n1_n2, _R1::den / __gcd_d1_d2>::value
>::type type;
};
#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2> using ratio_divide
= typename __ratio_divide<_R1, _R2>::type;
#else // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_divide
: public __ratio_divide<_R1, _R2>::type {};
#endif // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2>
struct __ratio_add
{
private:
static const intmax_t __gcd_n1_n2 = __static_gcd<_R1::num, _R2::num>::value;
static const intmax_t __gcd_d1_d2 = __static_gcd<_R1::den, _R2::den>::value;
public:
typedef typename ratio_multiply
<
ratio<__gcd_n1_n2, _R1::den / __gcd_d1_d2>,
ratio
<
__ll_add
<
__ll_mul<_R1::num / __gcd_n1_n2, _R2::den / __gcd_d1_d2>::value,
__ll_mul<_R2::num / __gcd_n1_n2, _R1::den / __gcd_d1_d2>::value
>::value,
_R2::den
>
>::type type;
};
#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2> using ratio_add
= typename __ratio_add<_R1, _R2>::type;
#else // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_add
: public __ratio_add<_R1, _R2>::type {};
#endif // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2>
struct __ratio_subtract
{
private:
static const intmax_t __gcd_n1_n2 = __static_gcd<_R1::num, _R2::num>::value;
static const intmax_t __gcd_d1_d2 = __static_gcd<_R1::den, _R2::den>::value;
public:
typedef typename ratio_multiply
<
ratio<__gcd_n1_n2, _R1::den / __gcd_d1_d2>,
ratio
<
__ll_sub
<
__ll_mul<_R1::num / __gcd_n1_n2, _R2::den / __gcd_d1_d2>::value,
__ll_mul<_R2::num / __gcd_n1_n2, _R1::den / __gcd_d1_d2>::value
>::value,
_R2::den
>
>::type type;
};
#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2> using ratio_subtract
= typename __ratio_subtract<_R1, _R2>::type;
#else // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_subtract
: public __ratio_subtract<_R1, _R2>::type {};
#endif // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
// ratio_equal
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_equal
: public integral_constant<bool, _R1::num == _R2::num && _R1::den == _R2::den> {};
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_not_equal
: public integral_constant<bool, !ratio_equal<_R1, _R2>::value> {};
// ratio_less
template <class _R1, class _R2, bool _Odd = false,
intmax_t _Q1 = _R1::num / _R1::den, intmax_t _M1 = _R1::num % _R1::den,
intmax_t _Q2 = _R2::num / _R2::den, intmax_t _M2 = _R2::num % _R2::den>
struct __ratio_less1
{
static const bool value = _Odd ? _Q2 < _Q1 : _Q1 < _Q2;
};
template <class _R1, class _R2, bool _Odd, intmax_t _Qp>
struct __ratio_less1<_R1, _R2, _Odd, _Qp, 0, _Qp, 0>
{
static const bool value = false;
};
template <class _R1, class _R2, bool _Odd, intmax_t _Qp, intmax_t _M2>
struct __ratio_less1<_R1, _R2, _Odd, _Qp, 0, _Qp, _M2>
{
static const bool value = !_Odd;
};
template <class _R1, class _R2, bool _Odd, intmax_t _Qp, intmax_t _M1>
struct __ratio_less1<_R1, _R2, _Odd, _Qp, _M1, _Qp, 0>
{
static const bool value = _Odd;
};
template <class _R1, class _R2, bool _Odd, intmax_t _Qp, intmax_t _M1,
intmax_t _M2>
struct __ratio_less1<_R1, _R2, _Odd, _Qp, _M1, _Qp, _M2>
{
static const bool value = __ratio_less1<ratio<_R1::den, _M1>,
ratio<_R2::den, _M2>, !_Odd>::value;
};
template <class _R1, class _R2, intmax_t _S1 = __static_sign<_R1::num>::value,
intmax_t _S2 = __static_sign<_R2::num>::value>
struct __ratio_less
{
static const bool value = _S1 < _S2;
};
template <class _R1, class _R2>
struct __ratio_less<_R1, _R2, 1LL, 1LL>
{
static const bool value = __ratio_less1<_R1, _R2>::value;
};
template <class _R1, class _R2>
struct __ratio_less<_R1, _R2, -1LL, -1LL>
{
static const bool value = __ratio_less1<ratio<-_R2::num, _R2::den>, ratio<-_R1::num, _R1::den> >::value;
};
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_less
: public integral_constant<bool, __ratio_less<_R1, _R2>::value> {};
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_less_equal
: public integral_constant<bool, !ratio_less<_R2, _R1>::value> {};
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_greater
: public integral_constant<bool, ratio_less<_R2, _R1>::value> {};
template <class _R1, class _R2>
struct _LIBCPP_VISIBLE ratio_greater_equal
: public integral_constant<bool, !ratio_less<_R1, _R2>::value> {};
template <class _R1, class _R2>
struct __ratio_gcd
{
typedef ratio<__static_gcd<_R1::num, _R2::num>::value,
__static_lcm<_R1::den, _R2::den>::value> type;
};
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_RATIO
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