|  | Home | Libraries | People | FAQ | More | 
Write all of the supplied data at the specified offset before returning.
template<
    typename SyncRandomAccessWriteDevice,
    typename Allocator>
std::size_t write_at(
    SyncRandomAccessWriteDevice & d,
    uint64_t offset,
    basic_streambuf< Allocator > & b);
This function is used to write a certain number of bytes of data to a random access device at a specified offset. The call will block until one of the following conditions is true:
basic_streambuf
              has been written.
            This operation is implemented in terms of zero or more calls to the device's write_some_at function.
The device to which the data is to be written. The type must support the SyncRandomAccessWriteDevice concept.
The offset at which the data will be written.
                The basic_streambuf
                object from which data will be written.
              
The number of bytes transferred.
Thrown on failure.
This overload is equivalent to calling:
boost::asio::write_at(
    d, 42, b,
    boost::asio::transfer_all());