35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
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// 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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#include "ubitset.h"
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namespace ustl {
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/// Copies bits from \p v of size \p n into \p buf as MSB "1011001..." LSB
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/// If \p buf is too small, MSB bits will be truncated.
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void convert_to_bitstring (const bitset_value_type* v, size_t n, string& buf) noexcept
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{
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string::iterator stri = buf.end();
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for (size_t i = 0; i < n && stri > buf.begin(); ++ i)
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for (bitset_value_type b = 1; b && stri > buf.begin(); b <<= 1)
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*--stri = (v[i] & b) ? '1' : '0';
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}
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/// Copies bits from \p buf as MSB "1011001..." LSB into \p v of size \p n.
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void convert_from_bitstring (const string& buf, bitset_value_type* v, size_t n) noexcept
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{
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string::const_iterator stri = buf.end();
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for (size_t i = 0; i < n; ++ i) {
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for (bitset_value_type b = 1; b; b <<= 1) {
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if (stri == buf.begin() || *--stri == '0')
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v[i] &= ~b;
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else
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v[i] |= b;
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}
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}
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}
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} // namespace ustl
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