Are there binary memory streams in C++

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To read and write binary data to streams, including stringstreams, use the read() and write() member functions. So

unsigned char a(1), b(2), c(3), d(4);
std::stringstream s;
s.write(reinterpret_cast<const char*>(&a), sizeof(unsigned char));
s.write(reinterpret_cast<const char*>(&b), sizeof(unsigned char));
s.write(reinterpret_cast<const char*>(&c), sizeof(unsigned char));
s.write(reinterpret_cast<const char*>(&d), sizeof(unsigned char));

s.read(reinterpret_cast<char*>(&v), sizeof(unsigned int)); 
std::cout << std::hex << v << "\n";

This gives 0x4030201 on my system.

Edit:
To make this work transparently with the insertion and extraction operators (<< and >>), your best bet it to create a derived streambuf that does the right thing, and pass that to whatever streams you want to use.

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