Function hello

test/doc/core_1_refresher.cpp:212–221

//[code_core_1_refresher_4
template <class SyncWriteStream>
void hello (SyncWriteStream& stream)
{
    net::const_buffer cb("Hello, world!", 13);
    do
    {
        auto bytes_transferred = stream.write_some(cb); // may throw
        cb += bytes_transferred; // adjust the pointer and size
    }
    while (cb.size() > 0);
}
//]

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