Root/
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | <html><!-- #BeginTemplate "/Templates/tmpl.dwt" --><!-- DW6 --><head><!-- #BeginEditable "doctitle" --><title>PTypes: cset: operators</title><!-- #EndEditable --><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link rel="stylesheet" href="styles.css"></head><body bgcolor="#FFFFFF" leftmargin="40" marginwidth="40"><p><a href="../index.html"><img src="title-21.png" width="253" height="39" alt="C++ Portable Types Library (PTypes) Version 2.1" border="0"></a> <hr size="1" noshade><!-- #BeginEditable "body" --><p class="hpath"><a href="index.html">Top</a>: <a href="basic.html">Basic types</a>: <a href="cset.html">cset</a>: Operators</p><blockquote> <pre class="lang">#include <ptypes.h>class cset {<span class="comment"> // assignment</span> cset& operator =(const cset& s);<span class="comment"> // union</span> cset& operator +=(const cset& s); cset& operator +=(char b); cset operator +(const cset& s) const; cset operator +(char b) const; friend cset operator +(char b, const cset& s);<span class="comment"> // difference</span> cset& operator -=(const cset& s); cset& operator -=(char b); cset operator -(const cset& s) const; cset operator -(char b) const;<span class="comment"> // intersection</span> cset& operator *=(const cset& s); cset operator *(const cset& s) const;<span class="comment"> // comparison</span> bool operator ==(const cset& s) const; bool operator !=(const cset& s) const; bool operator <=(const cset& s) const; bool operator >=(const cset& s) const;<span class="comment"> // membership</span> friend bool operator& (char b, const cset& s);}</pre></blockquote><p>The following rules apply to +, -, and *:</p><ul><li> <p>An ordinal O is in X + Y if and only if O is in X or Y (or both). Equivalent of bitwise <b>OR</b>.</p></li><li> <p> O is in X - Y if and only if O is in X but not in Y. Equivalent of bitwise <b>AND NOT</b>.</p></li><li> <p>O is in X * Y if and only if O is in both X and Y. Equivalent of bitwise <b>AND</b>.</p></li></ul><p>The following rules apply to comparison operations <=, >=, ==, !=:</p><ul><li> <p> X <= Y is true just in case every member of X is a member of Y; Z >= W is equivalent to W <= Z.</p></li><li> <p>U == V is true just in case U and V contain exactly the same members; otherwise, U != V is true.</p></li></ul><p> For an ordinal O and a set S, O & S is true just in case O is a member of S. Unlike the Pascal language, where membership operator is <b>in</b>, PTypes uses ampersand "&" as a membership test operator.</p><p><b>Note</b>: regardless of whether default char is signed or unsigned (usually set through compiler options) <span class="lang">cset</span> always treats char arguments as unsigned. This means, if the value of an argument is -1, e.g. in call to <span class="lang">operator &</span> or <span class="lang">operator +</span>, the value will be converted to 255, -2 will be treated as 254, etc.</p><p class="seealso">See also: <a href="cset.constructors.html">Constructors</a>, <a href="cset.manipulation.html">Manipulation</a></p><!-- #EndEditable --><hr size="1"><a href="../index.html" class="ns">PTypes home</a></body><!-- #EndTemplate --></html> |
