How can I get the same strstream functionality now that's deprecated?

Question

I use to write code like this:

void fun(char *buff, unsigned size)
{
    std::strstream str(buff, size);
    str << "hello world: " << 5;
}

so I can use stream output over an arbitrary buffer. I've found this technique both efficient (no allocations) and useful (streams!). Now that std::strstream is deprecated, how can I get the same speed+flexibility that I can get with this code?

Answer 1

The standard library doesn't provide that functionality. However, Boost does with its generic streams and array sources/sinks.

Boost Generic Stream
Boost Array Devices

char buff[size];
boost::stream<boost::array_sink> out(buff, size);
out << "Hello, world!";

(Code untested)