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1.1 ! root 1: . \"ident "%W%" ! 2: . \"Copyright (c) 1984 AT&T ! 3: . \"All Rights Reserved ! 4: . \"THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T ! 5: . \"The copyright notice above does not evidence any ! 6: . \"actual or intended publication of such source code. ! 7: .TH MANIP 3I+ "C++ Stream Library" " " ! 8: .SH NAME ! 9: manipulators \- iostream out of band manipulations ! 10: .SH SYNOPSIS ! 11: .ft B ! 12: .ta1i 2i ! 13: .nf ! 14: #include <iostream.h> ! 15: #include <iomanip.h> ! 16: ! 17: IOMANIPdeclare(T) ; ! 18: ! 19: class SMANIP(T) { ! 20: SMANIP(T)( ios& (*)(ios&,T), T); ! 21: }; ! 22: ! 23: class SAPP(T) { ! 24: SAPP(T)( ios& (*)(ios&,T)); ! 25: SMANIP(T) operator()(T); ! 26: }; ! 27: ! 28: ios& SMANIP(T)::operator<<(ios&); ! 29: ios& SMANIP(T)::operator>>(ios&); ! 30: istream& SMANIP(T)::operator>>(istream&); ! 31: ostream& SMANIP(T)::operator<<(ostream&); ! 32: iostream& SMANIP(T)::operator<<(iostream&); ! 33: iostream& SMANIP(T)::operator>>(iostream&); ! 34: ! 35: class IMANIP(T) { ! 36: IMANIP(T)( istream& (*)(istream&,T), T); ! 37: }; ! 38: ! 39: class IAPP(T) { ! 40: IAPP(T)( istream& (*)(istream&,T)); ! 41: IMANIP(T) operator()(T); ! 42: }; ! 43: ! 44: istream& operator>>(IMANIP(T), istream&); ! 45: ! 46: class OMANIP(T) { ! 47: OMANIP(T)( ostream& (*)(ostream&,T), T); ! 48: }; ! 49: ! 50: class OAPP(T) { ! 51: OAPP(T)( ostream& (*)(ostream&,T)); ! 52: OMANIP(T) operator()(T); ! 53: }; ! 54: ! 55: ostream& operator<<(OMANIP(T), ostream&); ! 56: ! 57: class IOMANIP(T) { ! 58: IOMANIP(T)( ios& (*)(ios&,T), T); ! 59: }; ! 60: ! 61: class IOAPP(T) { ! 62: IOAPP(T)( ios& (*)(ios&,T)); ! 63: IOMANIP(T) operator()(T); ! 64: }; ! 65: ! 66: iostream& operator<<(SMANIP(T), iostream&); ! 67: iostream& operator>>(SMANIP(T), iostream&); ! 68: ! 69: ! 70: IOMANIPdeclare(int) ; ! 71: ! 72: IOMANIP(int) setbase(int b) ; ! 73: IOMANIP(int) setw(int w) ; ! 74: .fi ! 75: .ft R ! 76: .SH DESCRIPTION ! 77: Manipulators are values that may be "inserted into" or ! 78: "extracted from" streams in order to achieve some effect ! 79: (other than to insert a representation of their value). ! 80: Ideally the types relating to manipulators would be parameterized ! 81: as "templates". ! 82: The macros defined in \f(CWiomanip.h\fR are used to simulate a templates. ! 83: \BIOMANIP(T)\fR declares ! 84: the various classes and operators. (All code is declared as inlines ! 85: so that no separate definitions are required.) Each of the other ! 86: \fBT\fR is used to construct the real names and therefore ! 87: must be a single ! 88: identifer. Each of the other macros also requires an identifier ! 89: and expands to a name. ! 90: .br ! 91: \(em \fBt\fR is a \fBT\fR. ! 92: .br ! 93: \(em \fBs\fR is an \f(CWios\fR. ! 94: .br ! 95: \(em \fBi\fR is an \f(CWistream\fR. ! 96: .br ! 97: \(em \fBo\fR is an \f(CWostream\fR. ! 98: .br ! 99: \(em \fBio\fR is an \f(CWiostream\fR. ! 100: .br ! 101: \(em \fBf\fR is an \f(CWios& (*)(ios&)\fR. ! 102: .br ! 103: \(em \fBif\fR is an \f(CWistream& (*)(istream&)\fR. ! 104: .br ! 105: \(em \fBof\fR is an \f(CWostream& (*)(ostream&)\fR. ! 106: .br ! 107: \(em \fBiof\fR is an \f(CWiostream& (*)(iostream&)\fR. ! 108: .TP ! 109: \fBs<<SMANIP(T)(f,t)\fR ! 110: .nf ! 111: .in -.5i ! 112: \fBs<<SMANIP(T)(f,t)\fR ! 113: \fBs>>SMANIP(T)(f,t)\fR ! 114: \fBs<<SAPP(T)(f)(t)\fR ! 115: \fBs>>SAPP(T)(f)(t)\fR ! 116: \fBi>>SMANIP(T)(if,t)\fR ! 117: \fBi>>SAPP(T)(if)(t)\fR ! 118: \fBo<<SMANIP(T)(of,t)\fR ! 119: \fBo<<SAPP(T)(of)(t)\fR ! 120: \fBio<<SMANIP(T)(iof,t)\fR ! 121: \fBio>>SMANIP(T)(iof,t)\fR ! 122: \fBio<<SAPP(T)(iof)(t)\fR ! 123: \fBio>>SAPP(T)(iof)(t)\fR ! 124: .in ! 125: .fi ! 126: Returns \fBfct(s,t)\fR, where \fBs\fR is the left operand of ! 127: the insertion or extractor operator and \fBfct\fR is \fBf\fR, ! 128: \fBif\R, \fBof\fR or \fBiof\fR. ! 129: .sp ! 130: .nf ! 131: .in -.5i ! 132: \fBi>>IMANIP(T)(if,t)\fR ! 133: \fBi>>IAPP(T)(if)(t)\fR ! 134: .in ! 135: .fi ! 136: Return \fBif(i,t)\fR. ! 137: .sp ! 138: .nf ! 139: .in -.5i ! 140: \fBo<<OMANIP(T)(of,t)\fR ! 141: \fBo<<OAPP(T)(of)(t)\fR ! 142: .in ! 143: .fi ! 144: Return \fBof(i,t)\fR. ! 145: .sp ! 146: .nf ! 147: .in -.5i ! 148: \fBio<<IOMANIP(T)(iof,t)\fR ! 149: \fBio>>IOMANIP(T)(iof,t)\fR ! 150: \fBio<<IOAPP(T)(iof)(t)\fR ! 151: \fBio>>IOAPP(T)(iof)(t)\fR ! 152: .in ! 153: .fi ! 154: Return \fBiof(s,t)\fR. ! 155: .PP ! 156: \f(CWiomanip.h\fR contains a declaration, \f(CWIOMANIPdeclare(int)\fR ! 157: and some functions: ! 158: .sp ! 159: .nf ! 160: .in -.5i ! 161: \fBo<<setbase(n)\fR ! 162: \fBi>>setbase(n)\fR ! 163: \fBio<<setbase(n)\fR ! 164: \fBio>>setbase(n)\fR ! 165: .in ! 166: .fi ! 167: Sets the conversion base of the stream (left hand operand) to \fBn\fR. ! 168: .sp ! 169: .nf ! 170: .in -.5i ! 171: \fBo<<setw(n)\fR ! 172: \fBi>>setw(n)\fR ! 173: \fBio<<setw(n)\fR ! 174: \fBio>>setw(n)\fR ! 175: .in ! 176: .fi ! 177: Sets the \f(CWwidth\fR format state variable ! 178: the stream (left hand operand) to \fBn\fR. ! 179: .SH CAVEATS ! 180: Syntax errors will be reported if ! 181: \fBIOMANIP(T)\fR occurs more than once in a file with the ! 182: same \fBT\fR. ! 183: .SH SEE ALSO ! 184: ios(3C++) ! 185: istream(3C++) ! 186: ostream(3C++)
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