[ios.openmode]

31 Input/output library [input.output]

using openmode = T3;

The type openmode is a bitmask type ([bitmask.types]).

It contains the elements indicated in Table 139 .

Table 139 — openmode effects [tab:ios.openmode]

🔗 Element	Effect(s) if set
🔗 app	seek to end before each write
🔗 ate	open and seek to end immediately after opening
🔗 binary	perform input and output in binary mode (as opposed to text mode)
🔗 in	open for input
🔗 noreplace	open in exclusive mode
🔗 out	open for output
🔗 trunc	truncate an existing stream when opening