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63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
/* Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_BYTE_VECTOR_H
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#define COMMON_BYTE_VECTOR_H
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#include "common/def-vector.h"
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namespace gdb {
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/* byte_vector is a gdb_byte std::vector with a custom allocator that
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unlike std::vector<gdb_byte> does not zero-initialize new elements
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by default when the vector is created/resized. This is what you
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usually want when working with byte buffers, since if you're
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creating or growing a buffer you'll most surely want to fill it in
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with data, in which case zero-initialization would be a
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pessimization. For example:
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gdb::byte_vector buf (some_large_size);
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fill_with_data (buf.data (), buf.size ());
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On the odd case you do need zero initialization, then you can still
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call the overloads that specify an explicit value, like:
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gdb::byte_vector buf (some_initial_size, 0);
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buf.resize (a_bigger_size, 0);
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(Or use std::vector<gdb_byte> instead.)
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Note that unlike std::vector<gdb_byte>, function local
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gdb::byte_vector objects constructed with an initial size like:
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gdb::byte_vector buf (some_size);
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fill_with_data (buf.data (), buf.size ());
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usually compile down to the exact same as:
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std::unique_ptr<byte[]> buf (new gdb_byte[some_size]);
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fill_with_data (buf.get (), some_size);
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with the former having the advantage of being a bit more readable,
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and providing the whole std::vector API, if you end up needing it.
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*/
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using byte_vector = gdb::def_vector<gdb_byte>;
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} /* namespace gdb */
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#endif /* COMMON_DEF_VECTOR_H */
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