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#ifndef CONST_ARRAY_HPP
#define CONST_ARRAY_HPP
// const_array.hpp - just a pointer-to-const and a length
//
// Copyright © 2011-2012 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
#include "sanity.hpp"
#include <cstring>
#include <iterator>
#include <ostream>
#include <string>
#include <vector>
#ifdef WORKAROUND_GCC46_COMPILER
// constexpr is buggy with templates in this version
# define constexpr /* nothing */
#endif
// TODO see if I ever actually use this, and not the subclass
template<class T>
class const_array
{
const T *d;
size_t n;
public:
typedef const T *iterator;
typedef std::reverse_iterator<iterator> reverse_iterator;
constexpr
const_array(std::nullptr_t)
: d(nullptr), n(0)
{}
constexpr
const_array(const T *p, size_t z)
: d(p), n(z)
{}
constexpr
const_array(const T *b, const T *e)
: d(b), n(e - b)
{}
const_array(std::initializer_list<T> list)
: d(list.begin()), n(list.size())
{}
// Implicit conversion from std::vector
const_array(const std::vector<T>& v)
: d(v.data()), n(v.size())
{}
// but disallow conversion from a temporary
const_array(std::vector<T>&&) = delete;
// All methods are non-const to "encourage" you
// to always pass a const_array by value.
// After all, "const const_array" looks funny.
constexpr
const T *data() { return d; }
constexpr
size_t size() { return n; }
constexpr
bool empty() { return not n; }
constexpr explicit
operator bool() { return n; }
constexpr
std::pair<const_array, const_array> cut(size_t o)
{
return {const_array(d, o), const_array(d + o, n - o)};
}
constexpr
const_array first(size_t o)
{
return cut(o).first;
}
constexpr
const_array last(size_t l)
{
return cut(size() - l).second;
}
constexpr
const_array after(size_t o)
{
return cut(o).second;
}
constexpr
iterator begin() { return d; }
constexpr
iterator end() { return d + n; }
constexpr
reverse_iterator rbegin() { return reverse_iterator(end()); }
constexpr
reverse_iterator rend() { return reverse_iterator(begin()); }
constexpr
const T& front() { return *begin(); }
constexpr
const T& back() { return *rbegin(); }
};
// subclass just provides a simpler name and some conversions
class const_string : public const_array<char>
{
public:
// Implicit conversion from C string.
constexpr
const_string(const char *z)
: const_array<char>(z, z ? strlen(z) : 0)
{}
// Same as parent constructor.
constexpr
const_string(const char *s, size_t l)
: const_array<char>(s, l)
{}
// Same as parent constructor.
constexpr
const_string(const char *b, const char *e)
: const_array<char>(b, e)
{}
// Same as parent constructor.
const_string(const std::vector<char> s)
: const_array<char>(s)
{}
// Implicit conversion from C++ string.
const_string(const std::string& s)
: const_array<char>(s.data(), s.size())
{}
// but disallow converion from a temporary.
const_string(std::string&&) = delete;
// allow being sloppy
constexpr
const_string(const_array<char> a)
: const_array<char>(a)
{}
};
#ifdef WORKAROUND_GCC46_COMPILER
# undef constexpr
#endif
inline
std::ostream& operator << (std::ostream& o, const_string s)
{
return o.write(s.data(), s.size());
}
#endif // CONST_ARRAY_HPP
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