99 lines
3.9 KiB
C++
99 lines
3.9 KiB
C++
// This file is part of the uSTL library, an STL implementation.
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//
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// Copyright (c) 2005 by Mike Sharov <msharov@users.sourceforge.net>
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// This file is free software, distributed under the MIT License.
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#pragma once
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#include "assert.h"
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#include "ualgobase.h"
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/// The ustl namespace contains all ustl classes and algorithms.
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namespace ustl {
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class istream;
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class ostream;
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class ostringstream;
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/// \class cmemlink cmemlink.h ustl.h
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/// \ingroup MemoryManagement
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///
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/// \brief A read-only pointer to a sized block of memory.
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///
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/// Use this class the way you would a const pointer to an allocated unstructured block.
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/// The pointer and block size are available through member functions and cast operator.
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///
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/// Example usage:
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///
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/// \code
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/// void* p = malloc (46721);
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/// cmemlink a, b;
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/// a.link (p, 46721);
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/// assert (a.size() == 46721));
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/// b = a;
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/// assert (b.size() == 46721));
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/// assert (b.DataAt(34) == a.DataAt(34));
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/// assert (0 == memcmp (a, b, 12));
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/// \endcode
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///
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class cmemlink {
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public:
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typedef char value_type;
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typedef const value_type* pointer;
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typedef const value_type* const_pointer;
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typedef value_type reference;
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typedef value_type const_reference;
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typedef size_t size_type;
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typedef uint32_t written_size_type;
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typedef ptrdiff_t difference_type;
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typedef const_pointer const_iterator;
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typedef const_iterator iterator;
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typedef const cmemlink& rcself_t;
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public:
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inline cmemlink (void) : _data (nullptr), _size (0) { }
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inline cmemlink (const void* p, size_type n) : _data (const_pointer(p)), _size (n) { assert (p || !n); }
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inline cmemlink (const cmemlink& l) : _data (l._data), _size (l._size) {}
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inline virtual ~cmemlink (void) noexcept {}
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void link (const void* p, size_type n);
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inline void link (const cmemlink& l) { link (l.begin(), l.size()); }
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inline void link (const void* first, const void* last) { link (first, distance (first, last)); }
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inline void relink (const void* p, size_type n);
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virtual void unlink (void) noexcept { _data = nullptr; _size = 0; }
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inline rcself_t operator= (const cmemlink& l) { link (l); return *this; }
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bool operator== (const cmemlink& l) const noexcept;
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inline void swap (cmemlink& l) { ::ustl::swap (_data, l._data); ::ustl::swap (_size, l._size); }
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inline size_type size (void) const { return _size; }
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inline size_type max_size (void) const { return size(); }
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inline size_type readable_size (void) const { return size(); }
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inline bool empty (void) const { return !size(); }
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inline const_pointer data (void) const { return _data; }
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inline const_pointer cdata (void) const { return _data; }
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inline iterator begin (void) const { return iterator (cdata()); }
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inline iterator iat (size_type i) const { assert (i <= size()); return begin() + i; }
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inline iterator end (void) const { return iat (size()); }
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inline void resize (size_type n) { _size = n; }
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inline void read (istream&) { assert (!"ustl::cmemlink is a read-only object."); }
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void write (ostream& os) const;
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size_type stream_size (void) const noexcept;
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void text_write (ostringstream& os) const;
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void write_file (const char* filename, int mode = 0644) const;
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private:
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const_pointer _data; ///< Pointer to the data block (const)
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size_type _size; ///< size of the data block
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};
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//----------------------------------------------------------------------
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/// A fast alternative to link which can be used when relinking to the same block (i.e. when it is resized)
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inline void cmemlink::relink (const void* p, size_type n)
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{
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_data = reinterpret_cast<const_pointer>(p);
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_size = n;
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}
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//----------------------------------------------------------------------
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/// Use with cmemlink-derived classes to link to a static array
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#define static_link(v) link (VectorBlock(v))
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} // namespace ustl
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