Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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write_at (6 of 8 overloads)

Write all of the supplied data at the specified offset before returning.

template<
    typename SyncRandomAccessWriteDevice,
    typename Allocator>
std::size_t write_at(
    SyncRandomAccessWriteDevice & d,
    boost::uint64_t offset,
    basic_streambuf< Allocator > & b,
    boost::system::error_code & ec);

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:

This operation is implemented in terms of zero or more calls to the device's write_some_at function.

Parameters

d

The device to which the data is to be written. The type must support the SyncRandomAccessWriteDevice concept.

offset

The offset at which the data will be written.

b

The basic_streambuf object from which data will be written.

ec

Set to indicate what error occurred, if any.

Return Value

The number of bytes transferred.

Remarks

This overload is equivalent to calling:

boost::asio::write_at(
    d, 42, b,
    boost::asio::transfer_all(), ec);

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