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
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
Attempt to read a certain amount of data at the specified offset before returning.
template<
typename SyncRandomAccessReadDevice,
typename Allocator>
std::size_t read_at(
SyncRandomAccessReadDevice & d,
uint64_t offset,
basic_streambuf< Allocator > & b,
boost::system::error_code & ec);
This function is used to read a certain number of bytes of data from a random access device at the 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 read_some_at function.
The device from which the data is to be read. The type must support the SyncRandomAccessReadDevice concept.
The offset at which the data will be read.
The basic_streambuf
object into which the data will be read.
Set to indicate what error occurred, if any.
The number of bytes transferred.
This overload is equivalent to calling:
boost::asio::read_at(
d, 42, b,
boost::asio::transfer_all(), ec);