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| <H2>negate</H2> |
| <P><B>Library:</B> <A HREF="2-4.html">General utilities</A></P> |
| |
| <PRE><HR><B><I>Does not inherit</I></B><HR></PRE> |
| |
| <UL> |
| <LI><A HREF="#sec1">Local Index</A></LI> |
| <LI><A HREF="#sec2">Summary</A></LI> |
| <LI><A HREF="#sec3">Synopsis</A></LI> |
| <LI><A HREF="#sec4">Description</A></LI> |
| <LI><A HREF="#sec5">Interface</A></LI> |
| <LI><A HREF="#sec6">See Also</A></LI> |
| <LI><A HREF="#sec7">Standards Conformance</A></LI> |
| </UL> |
| <A NAME="sec1"><H3>Local Index</H3></A> |
| No Entries |
| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>Unary function object that returns the negation of its argument</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <functional> |
| |
| namespace std { |
| template <class T> |
| struct negate : public unary_function<T, T>; |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <P><B><I>negate</I></B> is a unary function object. Its <SAMP>operator()</SAMP> returns the inverse of its argument. For boolean arguments, <SAMP>operator()</SAMP> returns <SAMP>true</SAMP> if its argument is <SAMP>false</SAMP>, or <SAMP>false</SAMP> if its argument is <SAMP>true</SAMP>. For numeric arguments, <SAMP>operator()</SAMP> returns the additive inverse of the argument. You can pass a <B><I>negate</I></B> object to any algorithm that requires a unary function. For example, the <SAMP><A HREF="transform.html">transform()</A></SAMP> algorithm applies a unary operation to the values in a collection and stores the result. <B><I>negate</I></B> could be used in that algorithm in the following manner:</P> |
| |
| <UL><PRE>vector<int> vec1; |
| vector<int> vecResult; |
| . |
| . |
| . |
| transform(vec1.begin(), vec1.end(), vecResult.begin(), |
| negate<int>()); |
| </PRE></UL> |
| <P>After this call to <SAMP><A HREF="transform.html">transform()</A></SAMP>, <SAMP>vecResult(n)</SAMP> contains the negation of the element in <SAMP>vec1(n)</SAMP>.</P> |
| <A NAME="sec5"><H3>Interface</H3></A> |
| |
| <UL><PRE>namespace std { |
| |
| template <class T> |
| struct negate : unary_function<T, T> { |
| T operator() (const T&) const; |
| }; |
| } |
| </PRE></UL> |
| <A NAME="sec6"><H3>See Also</H3></A> |
| <P><A HREF="functionobjects.html">Function Objects</A>, <B><I><A HREF="unary-function.html">unary_function</A></I></B></P> |
| <A NAME="sec7"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.5</I></P> |
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