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]

31.5.2.2.2 Type ios_base::fmtflags [ios.fmtflags]

using fmtflags = T1;

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

Setting its elements has the effects indicated in Table 131 .

Table 131: fmtflags effects [tab:ios.fmtflags]

🔗	Element	Effect(s) if set
🔗	boolalpha	insert and extract bool type in alphabetic format
🔗	dec	converts integer input or generates integer output in decimal base
🔗	fixed	generate floating-point output in fixed-point notation
🔗	hex	converts integer input or generates integer output in hexadecimal base
🔗	internal	adds fill characters at a designated internal point in certain generated output, or identical to right if no such point is designated
🔗	left	adds fill characters on the right (final positions) of certain generated output
🔗	oct	converts integer input or generates integer output in octal base
🔗	right	adds fill characters on the left (initial positions) of certain generated output
🔗	scientific	generates floating-point output in scientific notation
🔗	showbase	generates a prefix indicating the numeric base of generated integer output
🔗	showpoint	generates a decimal-point character unconditionally in generated floating-point output
🔗	showpos	generates a + sign in non-negative generated numeric output
🔗	skipws	skips leading whitespace before certain input operations
🔗	unitbuf	flushes output after each output operation
🔗	uppercase	replaces certain lowercase letters with their uppercase equivalents in generated output

Type fmtflags also defines the constants indicated in Table 132 .

Table 132: fmtflags constants [tab:ios.fmtflags.const]

🔗	Constant	Allowable values
🔗	adjustfield	left \| right \| internal
🔗	basefield	dec \| oct \| hex
🔗	floatfield	scientific \| fixed