94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
/*
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Copyright (c) 2015-2018, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_STACK_ALLOCATOR
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#define TORRENT_STACK_ALLOCATOR
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#include "libtorrent/assert.hpp"
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#include "libtorrent/span.hpp"
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#include "libtorrent/string_view.hpp"
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#include "libtorrent/aux_/vector.hpp"
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#include "libtorrent/aux_/numeric_cast.hpp"
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#include <cstdarg> // for va_list
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#include <cstdio> // for vsnprintf
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#include <cstring>
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namespace libtorrent { namespace aux {
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struct allocation_slot
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{
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allocation_slot() noexcept : m_idx(-1) {}
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allocation_slot(allocation_slot const&) noexcept = default;
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allocation_slot(allocation_slot&&) noexcept = default;
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allocation_slot& operator=(allocation_slot const&) = default;
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allocation_slot& operator=(allocation_slot&&) noexcept = default;
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bool operator==(allocation_slot const& s) const { return m_idx == s.m_idx; }
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bool operator!=(allocation_slot const& s) const { return m_idx != s.m_idx; }
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friend struct stack_allocator;
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private:
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explicit allocation_slot(int idx) noexcept : m_idx(idx) {}
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int val() const { return m_idx; }
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int m_idx;
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};
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struct TORRENT_EXTRA_EXPORT stack_allocator
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{
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stack_allocator() {}
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// non-copyable
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stack_allocator(stack_allocator const&) = delete;
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stack_allocator& operator=(stack_allocator const&) = delete;
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stack_allocator(stack_allocator&&) = default;
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stack_allocator& operator=(stack_allocator&&) = default;
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allocation_slot copy_string(string_view str);
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allocation_slot copy_string(char const* str);
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allocation_slot format_string(char const* fmt, va_list v);
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allocation_slot copy_buffer(span<char const> buf);
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allocation_slot allocate(int bytes);
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char* ptr(allocation_slot idx);
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char const* ptr(allocation_slot idx) const;
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void swap(stack_allocator& rhs);
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void reset();
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private:
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vector<char> m_storage;
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};
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} }
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#endif
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