### write_at

The `write_at` function is a composed operation that writes a certain amount of data at a specified offset before returning.

Write all of the supplied data at the 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,
        asio::error_code & ec);
      » more...

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

    template<
        typename SyncRandomAccessWriteDevice,
        typename ConstBufferSequence,
        typename CompletionCondition>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        const ConstBufferSequence & buffers,
        CompletionCondition completion_condition,
        constraint_t< is_completion_condition< CompletionCondition >::value >  = 0);
      » more...

    template<
        typename SyncRandomAccessWriteDevice,
        typename ConstBufferSequence,
        typename CompletionCondition>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        const ConstBufferSequence & buffers,
        CompletionCondition completion_condition,
        asio::error_code & ec,
        constraint_t< is_completion_condition< CompletionCondition >::value >  = 0);
      » 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);
      » more...

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

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

    template<
        typename SyncRandomAccessWriteDevice,
        typename Allocator,
        typename CompletionCondition>
    std::size_t write_at(
        SyncRandomAccessWriteDevice & d,
        uint64_t offset,
        basic_streambuf< Allocator > & b,
        CompletionCondition completion_condition,
        constraint_t< is_completion_condition< CompletionCondition >::value >  = 0);
      » 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,
        asio::error_code & ec,
        constraint_t< is_completion_condition< CompletionCondition >::value >  = 0);
      » more...

##### Requirements

Header: `asio/impl/write_at.hpp`

Convenience header: `asio.hpp`