1 files changed, 175 insertions, 0 deletions
diff --git a/src/common/const_array.hpp b/src/common/const_array.hpp
new file mode 100644
index 0000000..12c5d6f
--- /dev/null
+++ b/src/common/const_array.hpp
@@ -0,0 +1,175 @@
+#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 ANNOYING_GCC46_WORKAROUNDS
+# warning "like this one"
+// constexpr is buggy with templates in this version
+# define constexpr /* nothing */
+#endif
+
+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 ANNOYING_GCC46_WORKAROUNDS
+# undef constexpr
+#endif
+
+inline
+std::ostream& operator << (std::ostream& o, const_string s)
+{
+    return o.write(s.data(), s.size());
+}
+
+#endif // CONST_ARRAY_HPP