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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#ifndef _D_ARRAY_FUN_H_
#define _D_ARRAY_FUN_H_
#include <cstdlib>
#include <functional>
namespace aria2 {
// calculate length of array
template<typename T, size_t N>
char (&char_array_ref_fun(T (&)[N]))[N];
// For 0 length array
template<typename T>
char (&char_array_ref_fun(T (&)[0u]))[0u];
// To calculate size of array at compile time, we use macro here.
#define A2_ARRAY_LEN(X) sizeof(char_array_ref_fun(X))
template<typename T, size_t N>
T* vbegin(T (&a)[N])
{
return a;
}
template<typename T, size_t N>
T* vend(T (&a)[N])
{
return a+N;
}
template<typename T>
class array_ptr {
private:
T* array_;
// Copies are not allowed. Let's make them private.
array_ptr(const array_ptr& s);
array_ptr& operator=(const array_ptr& s);
template<typename S>
array_ptr& operator=(const array_ptr<S>& s);
public:
array_ptr():array_(0) {}
explicit array_ptr(T* array):array_(array) {}
~array_ptr()
{
delete [] array_;
}
operator T*()
{
return array_;
}
operator const T*() const
{
return array_;
}
};
template<typename T, size_t N>
class array_wrapper {
private:
T array_[N];
public:
array_wrapper() {}
operator T*()
{
return array_;
}
operator const T*() const
{
return array_;
}
size_t size() const
{
return N;
}
};
// Expression Template for array
namespace expr {
template<typename L, typename OpTag, typename R>
struct BinExpr {
BinExpr(const L& l, const R& r):l_(l), r_(r) {}
typedef typename OpTag::returnType returnType;
returnType operator[](size_t index) const
{
return OpTag::apply(l_[index], r_[index]);
}
const L& l_;
const R& r_;
};
template<typename OpTag, typename A>
struct UnExpr {
UnExpr(const A& a):a_(a) {}
typedef typename OpTag::returnType returnType;
returnType operator[](size_t index) const
{
return OpTag::apply(a_[index]);
}
const A& a_;
};
template<typename T>
struct And
{
typedef T returnType;
static inline returnType apply(T lhs, T rhs) { return lhs&rhs; }
};
template<typename T>
struct Or
{
typedef T returnType;
static inline returnType apply(T lhs, T rhs) { return lhs|rhs; }
};
template<typename T>
struct Negate
{
typedef T returnType;
static inline returnType apply(T a) { return ~a; }
};
template<typename T>
struct Array
{
typedef T returnType;
Array(const T* t):t_(t) {}
const T* t_;
returnType operator[](size_t index) const { return t_[index]; }
};
template<typename T>
Array<T>
array(const T* t) { return Array<T>(t); }
template<typename L, typename R>
BinExpr<L, And<typename L::returnType>, R>
operator&(const L& l, const R& r)
{
return BinExpr<L, And<typename L::returnType>, R>(l, r);
}
template<typename L, typename R>
BinExpr<L, Or<typename L::returnType>, R>
operator|(const L& l, const R& r)
{
return BinExpr<L, Or<typename L::returnType>, R>(l, r);
}
template<typename A>
UnExpr<Negate<typename A::returnType>, A>
operator~(const A& a)
{
return UnExpr<Negate<typename A::returnType>, A>(a);
}
} // namespace expr
} // namespace aria2
#endif // _D_ARRAY_FUN_H_
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