The async_write_at function is a composed asynchronous operation that writes a certain amount of data at the specified offset before completion.

Start an asynchronous operation to write all of the supplied data at the specified offset.

template<
    typename AsyncRandomAccessWriteDevice,
    typename ConstBufferSequence,
    typename WriteToken = default_completion_token_t<        typename AsyncRandomAccessWriteDevice::executor_type>>
DEDUCED async_write_at(
    AsyncRandomAccessWriteDevice & d,
    uint64_t offset,
    const ConstBufferSequence & buffers,
    WriteToken && token = default_completion_token_t< typename AsyncRandomAccessWriteDevice::executor_type >());
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Start an asynchronous operation to write a certain amount of data at the specified offset.

template<
    typename AsyncRandomAccessWriteDevice,
    typename ConstBufferSequence,
    typename CompletionCondition,
    typename WriteToken = default_completion_token_t<        typename AsyncRandomAccessWriteDevice::executor_type>>
DEDUCED async_write_at(
    AsyncRandomAccessWriteDevice & d,
    uint64_t offset,
    const ConstBufferSequence & buffers,
    CompletionCondition completion_condition,
    WriteToken && token = default_completion_token_t< typename AsyncRandomAccessWriteDevice::executor_type >());
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Start an asynchronous operation to write all of the supplied data at the specified offset.

template<
    typename AsyncRandomAccessWriteDevice,
    typename Allocator,
    typename WriteToken = default_completion_token_t<        typename AsyncRandomAccessWriteDevice::executor_type>>
DEDUCED async_write_at(
    AsyncRandomAccessWriteDevice & d,
    uint64_t offset,
    basic_streambuf< Allocator > & b,
    WriteToken && token = default_completion_token_t< typename AsyncRandomAccessWriteDevice::executor_type >());
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Start an asynchronous operation to write a certain amount of data at the specified offset.

template<
    typename AsyncRandomAccessWriteDevice,
    typename Allocator,
    typename CompletionCondition,
    typename WriteToken = default_completion_token_t<        typename AsyncRandomAccessWriteDevice::executor_type>>
DEDUCED async_write_at(
    AsyncRandomAccessWriteDevice & d,
    uint64_t offset,
    basic_streambuf< Allocator > & b,
    CompletionCondition completion_condition,
    WriteToken && token = default_completion_token_t< typename AsyncRandomAccessWriteDevice::executor_type >());
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Requirements

Header: boost/asio/impl/write_at.hpp

Convenience header: boost/asio.hpp