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

Requirements

Header: asio/write_at.hpp

Convenience header: asio.hpp