31 Input/output library [input.output]

31.5 Iostreams base classes [iostreams.base]

31.5.2 Class ios_base [ios.base]

31.5.2.2 Types [ios.types]

31.5.2.2.4 Type ios_base​::​openmode [ios.openmode]

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using openmode = T3;
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The type openmode is a bitmask type ([bitmask.types]).
It contains the elements indicated in Table 139.
Table 139 — openmode effects [tab:ios.openmode]
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Element
Effect(s) if set
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app
seek to end before each write
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ate
open and seek to end immediately after opening
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binary
perform input and output in binary mode (as opposed to text mode)
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in
open for input
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noreplace
open in exclusive mode
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out
open for output
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trunc
truncate an existing stream when opening