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### write_at

Write a certain amount of data at a specified offset before returning.

    template<
        typename SyncRandomAccessWriteDevice,
        typename ConstBufferSequence>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        const ConstBufferSequence & buffers);
      » more...

    template<
        typename SyncRandomAccessWriteDevice,
        typename ConstBufferSequence>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        const ConstBufferSequence & buffers,
        boost::system::error_code & ec);
      » more...

    template<
        typename SyncRandomAccessWriteDevice,
        typename ConstBufferSequence,
        typename CompletionCondition>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        const ConstBufferSequence & buffers,
        CompletionCondition completion_condition);
      » more...

    template<
        typename SyncRandomAccessWriteDevice,
        typename ConstBufferSequence,
        typename CompletionCondition>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        const ConstBufferSequence & buffers,
        CompletionCondition completion_condition,
        boost::system::error_code & ec);
      » more...

    template<
        typename SyncRandomAccessWriteDevice,
        typename Allocator>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        basic_streambuf< Allocator > & b);
      » more...

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

    template<
        typename SyncRandomAccessWriteDevice,
        typename Allocator,
        typename CompletionCondition>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        basic_streambuf< Allocator > & b,
        CompletionCondition completion_condition);
      » more...

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

##### Requirements

Header: `boost/asio/write_at.hpp`

Convenience header: `boost/asio.hpp`