StackOverflow2013

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16577248
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0
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0
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2013-05-16T00:42:09.297
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2013-05-16T10:19:27.793
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2013-05-16T10:19:27.793
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1000282
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1000282
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16575611
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2
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<pre><code>#include <bitset> #include <sstream> #include <iostream> #include <cinttypes> namespace my { template<size_t S> std::istream &operator >> (std::istream &is, std::bitset<S> &bits) { std::uint8_t byte; size_t i = 0; while(i < S && (is >> byte)) for(size_t j = 0; j < 8 && i < S; ++j) bits[i++] = (byte >> j) & 1; return is; } } int main() { constexpr size_t bytes = 2; std::string bit_string("\x00\xFF", bytes); std::istringstream bit_stream(bit_string); std::bitset<8 * bytes> b; { using namespace my; bit_stream >> b; } std::cout << b << std::endl; for(size_t i = 0; i < b.size(); ++i) std::cout << b[i]; std::cout << std::endl; } </code></pre> <h3>output:</h3> <pre><code>1111111100000000 0000000011111111 </code></pre> <h3>run live:</h3> <p><a href="http://ideone.com/Is7xRy" rel="nofollow">http://ideone.com/Is7xRy</a></p> <h3>notes:</h3> <ul> <li><code>bitset</code> size is a non-type template parameter. You can't set it at runtime. So, this will only work with preallocation of the bitset and you'll get 0 padding for a larger bitset.</li> <li>If you want a runtime sized bitset, check out <a href="http://www.boost.org/doc/libs/1_53_0/libs/dynamic_bitset/dynamic_bitset.html" rel="nofollow">boost::dynamic_bitset</a>.</li> <li>The sample is expected to work for files just by replacing <code>istringstream</code> by <code>ifstream</code> appropriately .</li> </ul>
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1. POOpen file into array of bits in C++
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