valarray_after.h
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// The template and inlines for the -*- C++ -*- internal _Meta class.
// Copyright (C) 1997-2026 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, 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 General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/valarray_after.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{valarray}
*/
// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@cmla.ens-cachan.fr>
#ifndef _VALARRAY_AFTER_H
#define _VALARRAY_AFTER_H 1
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace __detail
{
//
// gslice_array closure.
//
template<class _Dom>
class _GBase
{
public:
typedef typename _Dom::value_type value_type;
_GBase (const _Dom& __e, const valarray<size_t>& __i)
: _M_expr (__e), _M_index(__i) {}
value_type
operator[] (size_t __i) const
{ return _M_expr[_M_index[__i]]; }
size_t
size () const
{ return _M_index.size(); }
private:
typename _ValArrayRef<_Dom>::__type _M_expr;
const valarray<size_t>& _M_index;
};
template<typename _Tp>
class _GBase<_Array<_Tp> >
{
public:
typedef _Tp value_type;
_GBase (_Array<_Tp> __a, const valarray<size_t>& __i)
: _M_array (__a), _M_index(__i) {}
value_type
operator[] (size_t __i) const
{ return _M_array._M_data[_M_index[__i]]; }
size_t
size () const
{ return _M_index.size(); }
private:
const _Array<_Tp> _M_array;
const valarray<size_t>& _M_index;
};
template<class _Dom>
struct _GClos<_Expr, _Dom>
: _GBase<_Dom>
{
typedef _GBase<_Dom> _Base;
typedef typename _Base::value_type value_type;
_GClos (const _Dom& __e, const valarray<size_t>& __i)
: _Base (__e, __i) {}
};
template<typename _Tp>
struct _GClos<_ValArray, _Tp>
: _GBase<_Array<_Tp> >
{
typedef _GBase<_Array<_Tp> > _Base;
typedef typename _Base::value_type value_type;
_GClos (_Array<_Tp> __a, const valarray<size_t>& __i)
: _Base (__a, __i) {}
};
//
// indirect_array closure
//
template<class _Dom>
class _IBase
{
public:
typedef typename _Dom::value_type value_type;
_IBase (const _Dom& __e, const valarray<size_t>& __i)
: _M_expr (__e), _M_index (__i) {}
value_type
operator[] (size_t __i) const
{ return _M_expr[_M_index[__i]]; }
size_t
size() const
{ return _M_index.size(); }
private:
typename _ValArrayRef<_Dom>::__type _M_expr;
const valarray<size_t>& _M_index;
};
template<class _Dom>
struct _IClos<_Expr, _Dom>
: _IBase<_Dom>
{
typedef _IBase<_Dom> _Base;
typedef typename _Base::value_type value_type;
_IClos (const _Dom& __e, const valarray<size_t>& __i)
: _Base (__e, __i) {}
};
template<typename _Tp>
struct _IClos<_ValArray, _Tp>
: _IBase<valarray<_Tp> >
{
typedef _IBase<valarray<_Tp> > _Base;
typedef _Tp value_type;
_IClos (const valarray<_Tp>& __a, const valarray<size_t>& __i)
: _Base (__a, __i) {}
};
} // namespace __detail
//
// class _Expr
//
template<class _Clos, typename _Tp>
class _Expr
{
public:
typedef _Tp value_type;
_Expr(const _Clos&);
const _Clos& operator()() const;
value_type operator[](size_t) const;
valarray<value_type> operator[](slice) const;
valarray<value_type> operator[](const gslice&) const;
valarray<value_type> operator[](const valarray<bool>&) const;
valarray<value_type> operator[](const valarray<size_t>&) const;
_Expr<_UnClos<__unary_plus, std::_Expr, _Clos>, value_type>
operator+() const;
_Expr<_UnClos<__negate, std::_Expr, _Clos>, value_type>
operator-() const;
_Expr<_UnClos<__bitwise_not, std::_Expr, _Clos>, value_type>
operator~() const;
_Expr<_UnClos<__logical_not, std::_Expr, _Clos>, bool>
operator!() const;
size_t size() const;
value_type sum() const;
valarray<value_type> shift(int) const;
valarray<value_type> cshift(int) const;
value_type min() const;
value_type max() const;
valarray<value_type> apply(value_type (*)(const value_type&)) const;
valarray<value_type> apply(value_type (*)(value_type)) const;
private:
const _Clos _M_closure;
};
template<class _Clos, typename _Tp>
inline
_Expr<_Clos, _Tp>::_Expr(const _Clos& __c) : _M_closure(__c) {}
template<class _Clos, typename _Tp>
inline const _Clos&
_Expr<_Clos, _Tp>::operator()() const
{ return _M_closure; }
template<class _Clos, typename _Tp>
inline _Tp
_Expr<_Clos, _Tp>::operator[](size_t __i) const
{ return _M_closure[__i]; }
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::operator[](slice __s) const
{
valarray<_Tp> __v = valarray<_Tp>(*this)[__s];
return __v;
}
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::operator[](const gslice& __gs) const
{
valarray<_Tp> __v = valarray<_Tp>(*this)[__gs];
return __v;
}
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::operator[](const valarray<bool>& __m) const
{
valarray<_Tp> __v = valarray<_Tp>(*this)[__m];
return __v;
}
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::operator[](const valarray<size_t>& __i) const
{
valarray<_Tp> __v = valarray<_Tp>(*this)[__i];
return __v;
}
template<class _Clos, typename _Tp>
inline size_t
_Expr<_Clos, _Tp>::size() const
{ return _M_closure.size(); }
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::shift(int __n) const
{
valarray<_Tp> __v = valarray<_Tp>(*this).shift(__n);
return __v;
}
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::cshift(int __n) const
{
valarray<_Tp> __v = valarray<_Tp>(*this).cshift(__n);
return __v;
}
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::apply(_Tp __f(const _Tp&)) const
{
valarray<_Tp> __v = valarray<_Tp>(*this).apply(__f);
return __v;
}
template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos, _Tp>::apply(_Tp __f(_Tp)) const
{
valarray<_Tp> __v = valarray<_Tp>(*this).apply(__f);
return __v;
}
// XXX: replace this with a more robust summation algorithm.
template<class _Clos, typename _Tp>
inline _Tp
_Expr<_Clos, _Tp>::sum() const
{
size_t __n = _M_closure.size();
if (__n == 0)
return _Tp();
else
{
_Tp __s = _M_closure[--__n];
while (__n != 0)
__s += _M_closure[--__n];
return __s;
}
}
template<class _Clos, typename _Tp>
inline _Tp
_Expr<_Clos, _Tp>::min() const
{ return __valarray_min(_M_closure); }
template<class _Clos, typename _Tp>
inline _Tp
_Expr<_Clos, _Tp>::max() const
{ return __valarray_max(_M_closure); }
template<class _Dom, typename _Tp>
inline _Expr<_UnClos<__logical_not, _Expr, _Dom>, bool>
_Expr<_Dom, _Tp>::operator!() const
{
typedef _UnClos<__logical_not, std::_Expr, _Dom> _Closure;
return _Expr<_Closure, bool>(_Closure(this->_M_closure));
}
#define _DEFINE_EXPR_UNARY_OPERATOR(_Op, _Name) \
template<class _Dom, typename _Tp> \
inline _Expr<_UnClos<_Name, std::_Expr, _Dom>, _Tp> \
_Expr<_Dom, _Tp>::operator _Op() const \
{ \
typedef _UnClos<_Name, std::_Expr, _Dom> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(this->_M_closure)); \
}
_DEFINE_EXPR_UNARY_OPERATOR(+, struct std::__unary_plus)
_DEFINE_EXPR_UNARY_OPERATOR(-, struct std::__negate)
_DEFINE_EXPR_UNARY_OPERATOR(~, struct std::__bitwise_not)
#undef _DEFINE_EXPR_UNARY_OPERATOR
#define _DEFINE_EXPR_BINARY_OPERATOR(_Op, _Name) \
template<class _Dom1, class _Dom2> \
inline _Expr<_BinClos<_Name, _Expr, _Expr, _Dom1, _Dom2>, \
typename __fun<_Name, typename _Dom1::value_type>::result_type> \
operator _Op(const _Expr<_Dom1, typename _Dom1::value_type>& __v, \
const _Expr<_Dom2, typename _Dom2::value_type>& __w) \
{ \
typedef typename _Dom1::value_type _Arg; \
typedef typename __fun<_Name, _Arg>::result_type _Value; \
typedef _BinClos<_Name, _Expr, _Expr, _Dom1, _Dom2> _Closure; \
return _Expr<_Closure, _Value>(_Closure(__v(), __w())); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_Name, _Expr, _Constant, _Dom, \
typename _Dom::value_type>, \
typename __fun<_Name, typename _Dom::value_type>::result_type> \
operator _Op(const _Expr<_Dom, typename _Dom::value_type>& __v, \
const typename _Dom::value_type& __t) \
{ \
typedef typename _Dom::value_type _Arg; \
typedef typename __fun<_Name, _Arg>::result_type _Value; \
typedef _BinClos<_Name, _Expr, _Constant, _Dom, _Arg> _Closure; \
return _Expr<_Closure, _Value>(_Closure(__v(), __t)); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_Name, _Constant, _Expr, \
typename _Dom::value_type, _Dom>, \
typename __fun<_Name, typename _Dom::value_type>::result_type> \
operator _Op(const typename _Dom::value_type& __t, \
const _Expr<_Dom, typename _Dom::value_type>& __v) \
{ \
typedef typename _Dom::value_type _Arg; \
typedef typename __fun<_Name, _Arg>::result_type _Value; \
typedef _BinClos<_Name, _Constant, _Expr, _Arg, _Dom> _Closure; \
return _Expr<_Closure, _Value>(_Closure(__t, __v())); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_Name, _Expr, _ValArray, \
_Dom, typename _Dom::value_type>, \
typename __fun<_Name, typename _Dom::value_type>::result_type> \
operator _Op(const _Expr<_Dom,typename _Dom::value_type>& __e, \
const valarray<typename _Dom::value_type>& __v) \
{ \
typedef typename _Dom::value_type _Arg; \
typedef typename __fun<_Name, _Arg>::result_type _Value; \
typedef _BinClos<_Name, _Expr, _ValArray, _Dom, _Arg> _Closure; \
return _Expr<_Closure, _Value>(_Closure(__e(), __v)); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_Name, _ValArray, _Expr, \
typename _Dom::value_type, _Dom>, \
typename __fun<_Name, typename _Dom::value_type>::result_type> \
operator _Op(const valarray<typename _Dom::value_type>& __v, \
const _Expr<_Dom, typename _Dom::value_type>& __e) \
{ \
typedef typename _Dom::value_type _Tp; \
typedef typename __fun<_Name, _Tp>::result_type _Value; \
typedef _BinClos<_Name, _ValArray, _Expr, _Tp, _Dom> _Closure; \
return _Expr<_Closure, _Value>(_Closure(__v, __e ())); \
}
_DEFINE_EXPR_BINARY_OPERATOR(+, struct std::__plus)
_DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
_DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
_DEFINE_EXPR_BINARY_OPERATOR(/, struct std::__divides)
_DEFINE_EXPR_BINARY_OPERATOR(%, struct std::__modulus)
_DEFINE_EXPR_BINARY_OPERATOR(^, struct std::__bitwise_xor)
_DEFINE_EXPR_BINARY_OPERATOR(&, struct std::__bitwise_and)
_DEFINE_EXPR_BINARY_OPERATOR(|, struct std::__bitwise_or)
_DEFINE_EXPR_BINARY_OPERATOR(<<, struct std::__shift_left)
_DEFINE_EXPR_BINARY_OPERATOR(>>, struct std::__shift_right)
_DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
_DEFINE_EXPR_BINARY_OPERATOR(||, struct std::__logical_or)
_DEFINE_EXPR_BINARY_OPERATOR(==, struct std::__equal_to)
_DEFINE_EXPR_BINARY_OPERATOR(!=, struct std::__not_equal_to)
_DEFINE_EXPR_BINARY_OPERATOR(<, struct std::__less)
_DEFINE_EXPR_BINARY_OPERATOR(>, struct std::__greater)
_DEFINE_EXPR_BINARY_OPERATOR(<=, struct std::__less_equal)
_DEFINE_EXPR_BINARY_OPERATOR(>=, struct std::__greater_equal)
#undef _DEFINE_EXPR_BINARY_OPERATOR
#define _DEFINE_EXPR_UNARY_FUNCTION(_Name, _UName) \
template<class _Dom> \
inline _Expr<_UnClos<_UName, _Expr, _Dom>, \
typename _Dom::value_type> \
_Name(const _Expr<_Dom, typename _Dom::value_type>& __e) \
{ \
typedef typename _Dom::value_type _Tp; \
typedef _UnClos<_UName, _Expr, _Dom> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(__e())); \
} \
\
template<typename _Tp> \
inline _Expr<_UnClos<_UName, _ValArray, _Tp>, _Tp> \
_Name(const valarray<_Tp>& __v) \
{ \
typedef _UnClos<_UName, _ValArray, _Tp> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(__v)); \
}
_DEFINE_EXPR_UNARY_FUNCTION(abs, struct std::_Abs)
_DEFINE_EXPR_UNARY_FUNCTION(cos, struct std::_Cos)
_DEFINE_EXPR_UNARY_FUNCTION(acos, struct std::_Acos)
_DEFINE_EXPR_UNARY_FUNCTION(cosh, struct std::_Cosh)
_DEFINE_EXPR_UNARY_FUNCTION(sin, struct std::_Sin)
_DEFINE_EXPR_UNARY_FUNCTION(asin, struct std::_Asin)
_DEFINE_EXPR_UNARY_FUNCTION(sinh, struct std::_Sinh)
_DEFINE_EXPR_UNARY_FUNCTION(tan, struct std::_Tan)
_DEFINE_EXPR_UNARY_FUNCTION(tanh, struct std::_Tanh)
_DEFINE_EXPR_UNARY_FUNCTION(atan, struct std::_Atan)
_DEFINE_EXPR_UNARY_FUNCTION(exp, struct std::_Exp)
_DEFINE_EXPR_UNARY_FUNCTION(log, struct std::_Log)
_DEFINE_EXPR_UNARY_FUNCTION(log10, struct std::_Log10)
_DEFINE_EXPR_UNARY_FUNCTION(sqrt, struct std::_Sqrt)
#undef _DEFINE_EXPR_UNARY_FUNCTION
#define _DEFINE_EXPR_BINARY_FUNCTION(_Fun, _UFun) \
template<class _Dom1, class _Dom2> \
inline _Expr<_BinClos<_UFun, _Expr, _Expr, _Dom1, _Dom2>, \
typename _Dom1::value_type> \
_Fun(const _Expr<_Dom1, typename _Dom1::value_type>& __e1, \
const _Expr<_Dom2, typename _Dom2::value_type>& __e2) \
{ \
typedef typename _Dom1::value_type _Tp; \
typedef _BinClos<_UFun, _Expr, _Expr, _Dom1, _Dom2> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(__e1(), __e2())); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_UFun, _Expr, _ValArray, _Dom, \
typename _Dom::value_type>, \
typename _Dom::value_type> \
_Fun(const _Expr<_Dom, typename _Dom::value_type>& __e, \
const valarray<typename _Dom::value_type>& __v) \
{ \
typedef typename _Dom::value_type _Tp; \
typedef _BinClos<_UFun, _Expr, _ValArray, _Dom, _Tp> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(__e(), __v)); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_UFun, _ValArray, _Expr, \
typename _Dom::value_type, _Dom>, \
typename _Dom::value_type> \
_Fun(const valarray<typename _Dom::valarray>& __v, \
const _Expr<_Dom, typename _Dom::value_type>& __e) \
{ \
typedef typename _Dom::value_type _Tp; \
typedef _BinClos<_UFun, _ValArray, _Expr, _Tp, _Dom> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(__v, __e())); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_UFun, _Expr, _Constant, _Dom, \
typename _Dom::value_type>, \
typename _Dom::value_type> \
_Fun(const _Expr<_Dom, typename _Dom::value_type>& __e, \
const typename _Dom::value_type& __t) \
{ \
typedef typename _Dom::value_type _Tp; \
typedef _BinClos<_UFun, _Expr, _Constant, _Dom, _Tp> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(__e(), __t)); \
} \
\
template<class _Dom> \
inline _Expr<_BinClos<_UFun, _Constant, _Expr, \
typename _Dom::value_type, _Dom>, \
typename _Dom::value_type> \
_Fun(const typename _Dom::value_type& __t, \
const _Expr<_Dom, typename _Dom::value_type>& __e) \
{ \
typedef typename _Dom::value_type _Tp; \
typedef _BinClos<_UFun, _Constant, _Expr, _Tp, _Dom> _Closure; \
return _Expr<_Closure, _Tp>(_Closure(__t, __e())); \
} \
\
template<typename _Tp> \
inline _Expr<_BinClos<_UFun, _ValArray, _ValArray, _Tp, _Tp>, _Tp> \
_Fun(const valarray<_Tp>& __v, const valarray<_Tp>& __w) \
{ \
typedef _BinClos<_UFun, _ValArray, _ValArray, _Tp, _Tp> _Closure;\
return _Expr<_Closure, _Tp>(_Closure(__v, __w)); \
} \
\
template<typename _Tp> \
inline _Expr<_BinClos<_UFun, _ValArray, _Constant, _Tp, _Tp>, _Tp> \
_Fun(const valarray<_Tp>& __v, \
const typename valarray<_Tp>::value_type& __t) \
{ \
typedef _BinClos<_UFun, _ValArray, _Constant, _Tp, _Tp> _Closure;\
return _Expr<_Closure, _Tp>(_Closure(__v, __t)); \
} \
\
template<typename _Tp> \
inline _Expr<_BinClos<_UFun, _Constant, _ValArray, _Tp, _Tp>, _Tp> \
_Fun(const typename valarray<_Tp>::value_type& __t, \
const valarray<_Tp>& __v) \
{ \
typedef _BinClos<_UFun, _Constant, _ValArray, _Tp, _Tp> _Closure;\
return _Expr<_Closure, _Tp>(_Closure(__t, __v)); \
}
_DEFINE_EXPR_BINARY_FUNCTION(atan2, struct std::_Atan2)
_DEFINE_EXPR_BINARY_FUNCTION(pow, struct std::_Pow)
#undef _DEFINE_EXPR_BINARY_FUNCTION
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif /* _CPP_VALARRAY_AFTER_H */
std
ISO C++ entities toplevel namespace is std.
std::__detail
Implementation details not part of the namespace std interface.