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Attempts to open the file at the path specified by `p` with the mode specified by `m`. Upon success, a subsequent call to `f.is_open()` will return `true`. If `f` refers to an open file, it is first closed as if by a call to `close` with the error ignored. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if an error occurred.
`f.size(ec)`
34
`std::uint64_t`
If `f` refers to an open file, this function attempts to determine the file size and return its value. If `f` does not refer to an open file, the function will set `ec` to `errc::invalid_argument` and return 0. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if an error occurred.
`f.pos(ec)`
If `f` refers to an open file, this function attempts to determine the current file offset and return it. If `f` does not refer to an open file, the function will set `ec` to `errc::invalid_argument` and return 0. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if an error occurred.
`f.seek(o,ec)`
Attempts to reposition the current file offset to the value `o`, which represents a byte offset relative to the beginning of the file. If `f` does not refer to an open file, the function will set `ec` to `errc::invalid_argument` and return immediately. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if an error occurred.
`f.read(b,n,ec)`
34
`std::size_t`
Attempts to read `n` bytes starting at the current file offset from the open file referred to by `f`. Bytes read are stored in the memory buffer at address `b` which must be at least `n` bytes in size. The function advances the file offset by the amount read, and returns the number of bytes actually read, which may be less than `n`. If `f` does not refer to an open file, the function will set `ec` to `errc::invalid_argument` and return immediately. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if an error occurred. If an end-of-file condition is detected prior to reading any bytes, the function will ensure that `!ec` is `true` and the return value shall be 0.
`f.write(c,n,ec)`
Attempts to write `n` bytes from the buffer pointed to by `c` to the current file offset of the open file referred to by `f`. The memory buffer at `c` must point to storage of at least `n` bytes meant to be copied to the file. The function advances the file offset by the amount written, and returns the number of bytes actually written, which may be less than `n`. If `f` does not refer to an open file, the function will set `ec` to `errc::invalid_argument` and return immediately. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if an error occurred.
Exemplar
Models
* [link beast.ref.boost__beast__file_posix `file_posix`]
* [link beast.ref.boost__beast__file_stdio `file_stdio`]
* [link beast.ref.boost__beast__file_win32 `file_win32`]

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String added in the repository
* [link beast.ref.boost__beast__file_posix `file_posix`]
* [link beast.ref.boost__beast__file_stdio `file_stdio`]
* [link beast.ref.boost__beast__file_win32 `file_win32`]
* [link beast.ref.boost__beast__file_posix `file_posix`]
* [link beast.ref.boost__beast__file_stdio `file_stdio`]
* [link beast.ref.boost__beast__file_win32 `file_win32`]
06/05/2026
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Glossary

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String information

Component
Boost Beast Translation (zh_Hans)/Doc / Qbk / 07 Concepts / File (qbk)
Source string description
type: list
Flags
read-only
Unit identifier
56252
Source string location
string ID 176
String age
06/05/2026
Last updated
06/05/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/07_concepts/File.qbk, string 40