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The next example shows how to use the one-argument set f ( > function to set flags without clearing others.
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EXAMPLE 12.5 Using cou t . set f ( ) to Set a Stream s Format Flags This example is the same as Example 12.4 except that set f ( ) is called instead of f lags ( ) . main0 1 int n = 234; long oldf = cout.setf( ios::hex I ios::uppercase ); tout cc n CC endl; cout.setf( ios::hex I ios:: showbase ); tout CC n cc endl; cout.flags(oldf); tout CC n CC endl;
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The first call to cou t . set f ( ) sets the hex and uppercase flags, while saving all the previous settings in o 1 df , so n is printed in uppercase hex. The second call to cou t . set f ( > sets the hex and showbase flags, leaving the uppercase flag set, so that the second output prints n is printed in uppercase hex with the leading OX to show that the numeral is hexadecimal. The call to cou t . flags ( ) restores the original (default) settings, which are lowercase decimal without showing the base.
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, Three subgroups of format flags are defined to facilitate avoiding a conflict between contradictory flags. Each group is identified by its format mask, as shown in Table 12.2. Table 12.2 Format Flags Mask
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ios::basefield ios:: adjustfield ios: :floatfield
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ios: :dec, ios::oct, ios::hex ios: :left, ios::right, ios::internal ios: :scientific, ios::fixed
These definitions are part of the ios class:
class ios { public: const long basefield = dec I act I hex; const long adjustfield = left I right I internal; const long floatfield = scientific I fixed; // more members included here 1;
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These constants are called masks because they are used to mask out all the flags except those in its group. For example, in the implementation of the unset f ( > function
long unsetf(long mask) { long t = _ flags SC mask; - flags &= -mask; return t; }
the expression - flags &= -mask clears all the flags in the mask, leaving all other flags unchanged. The effect of this function is to clear all the flags in the format mask and to return their previous settings:
EXAMPLE 12.6 Using unset f ( ) to Clear a Stream s Format Flags main0 { char buffer[80]; cin.unsetf(ios::skipws); // clear default skipws flag tin >> buffer; tout << " [" cc buffer CC t']\n"; tin >> buffer; tout << " [" CC buffer X-C rl]\nII; tin >> buffer; tout -c-c " [" XC buffer XX "]\n"; int n = 234; cout.setf( ios::hex 1 ios::uppercase 1 ios: :showbase ); tout C-C n K-C endl; cout.unsetf( ios::basefield ); // clear all radix flags tout -C-C n -CC endl;
The skipws flag is set by default, which means that ordinarily white space is skipped before reading a value into a variable. But the call to tin. unsetf clears this flag so that white space will not be ignored. The first three characters input are two blanks and the H, so the first read into buf f er reads only a single blank. That is because the second blank signals an end to that input. The second read into buf f er reads the second blank and the entire six-character string He1 lo, ". Again, input is terminated by the first
blank encountered after the reading begins. The call to tout . unset f clears all the flags that are in the base f i eld group. This includes the hex flag that was set with the cou t . set f call. m a y n o t w o rof tout .unsetf o l d e r c o m p i l e r s ( e . g . , v e r s i o n 4 . 5 o f Warning: This use k o n s o m e Microsoft Turbo C++).
The set f ( > function that takes two arguments uses a format mask in its second argument:
long setf(long f, long mask) ( long t = -flags; -flags = (-flags&-mask)1 (f&mask); return t; )
The mask specifies which group of flags is to be changed. The function clears all the flags in the group specified by mask and then sets the flag f if it is in that group.
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