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<Head>
<Title>unary_negate<AdaptablePredicate></Title>
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<H1>unary_negate<AdaptablePredicate></H1>
<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "functors.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right><Img src = "type.gif" Alt="" WIDTH = "194" HEIGHT = "39" ></TD>
</TR>
<TR>
<TD Align=left><Img src = "adaptors.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right></TD>
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<TR>
<TD Align=left VAlign=top><b>Categories</b>: functors, adaptors</TD>
<TD Align=right VAlign=top><b>Component type</b>: type</TD>
</TR>
</Table>
<h3>Description</h3>
<tt>Unary_negate</tt> is a <A href="functors.html">function object</A> adaptor: it is an
<A href="AdaptablePredicate.html">Adaptable Predicate</A> that represents the logical negation
of some other <A href="AdaptablePredicate.html">Adaptable Predicate</A>. That is: if <tt>f</tt> is an
object of class <tt>unary_negate<AdaptablePredicate></tt>, then
there exists an object <tt>pred</tt> of class <tt>AdaptablePredicate</tt>
such that <tt>f(x)</tt> always returns the same value as <tt>!pred(x)</tt>. <A href="#1">[1]</A>
There is rarely any reason to construct a <tt>unary_negate</tt>
directly; it is almost always easier to use the helper function <tt>not1</tt>.
<h3>Example</h3>
Finds the first element in a list that does not lie in the range
from 1 to 10.
<pre>
<A href="List.html">list</A><int> L;
...
<A href="List.html">list</A><int>::iterator in_range =
<A href="find_if.html">find_if</A>(L.begin(), L.end(),
<A href="unary_negate.html">not1</A>(<A href="binary_compose.html">compose2</A>(logical_and<bool>(),
<A href="binder2nd.html">bind2nd</A>(<A href="greater_equal.html">greater_equal</A><int>(), 1),
<A href="binder2nd.html">bind2nd</A>(<A href="less_equal.html">less_equal</A><int>(), 10))));
assert(in_range == L.end() || !(*in_range >= 1 && *in_range <= 10));
</pre>
<h3>Definition</h3>
Defined in the standard header <A href="functional">functional</A>, and in the nonstandard
backward-compatibility header <A href="function.h">function.h</A>.
<h3>Template parameters</h3>
<Table border>
<TR>
<TH>
Parameter
</TH>
<TH>
Description
</TH>
<TH>
Default
</TH>
</TR>
<TR>
<TD VAlign=top>
<tt>AdaptablePredicate</tt>
</TD>
<TD VAlign=top>
The type of the function object that this <tt>unary_negate</tt> is the logical
negation of.
</TD>
<TD VAlign=top>
</TD>
</tr>
</table>
<h3>Model of</h3>
<A href="AdaptablePredicate.html">Adaptable Predicate</A>
<h3>Type requirements</h3>
<tt>AdaptablePredicate</tt> must be a model of <A href="AdaptablePredicate.html">Adaptable Predicate</A>.
<h3>Public base classes</h3>
<tt><A href="unary_function.html">unary_function</A><<A href="AdaptablePredicate.html">AdaptablePredicate</A>::argument_type, bool></tt>
<h3>Members</h3>
<Table border>
<TR>
<TH>
Member
</TH>
<TH>
Where defined
</TH>
<TH>
Description
</TH>
</TR>
<TR>
<TD VAlign=top>
<tt>argument_type</tt>
</TD>
<TD VAlign=top>
<A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A>
</TD>
<TD VAlign=top>
The type of the argument: <tt><A href="AdaptablePredicate.html">AdaptablePredicate</A>::argument_type</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>result_type</tt>
</TD>
<TD VAlign=top>
<A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A>
</TD>
<TD VAlign=top>
The type of the result: <tt>bool</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>bool operator()(argument_type)</tt>
</TD>
<TD VAlign=top>
<A href="UnaryFunction.html">Unary Function</A>
</TD>
<TD VAlign=top>
Function call operator.
</TD>
</TR>
<TR>
<TD VAlign=top>
<pre>
unary_negate(const AdaptablePredicate& pred)
</pre>
</TD>
<TD VAlign=top>
<tt>unary_negate</tt>
</TD>
<TD VAlign=top>
See below.
</TD>
</TR>
<TR>
<TD VAlign=top>
<pre>
template <class <A href="AdaptablePredicate.html">AdaptablePredicate</A>>
unary_negate<AdaptablePredicate>
not1(const AdaptablePredicate& pred);
</pre>
</TD>
<TD VAlign=top>
<tt>unary_negate</tt>
</TD>
<TD VAlign=top>
See below.
</TD>
</tr>
</table>
<h3>New members</h3>
These members are not defined in the
<A href="AdaptablePredicate.html">Adaptable Predicate</A>
requirements, but are specific to
<tt>unary_negate</tt>.
<Table border>
<TR>
<TH>
Member
</TH>
<TH>
Description
</TH>
</TR>
<TR>
<TD VAlign=top>
<pre>
unary_negate(const AdaptablePredicate& pred)
</pre>
</TD>
<TD VAlign=top>
The constructor. Creates a <tt>unary_negate<AdaptablePredicate></tt>
whose underlying predicate is <tt>pred</tt>.
</TD>
</TR>
<TR>
<TD VAlign=top>
<pre>
template <class <A href="AdaptablePredicate.html">AdaptablePredicate</A>>
unary_negate<AdaptablePredicate>
not1(const AdaptablePredicate& pred);
</pre>
</TD>
<TD VAlign=top>
If <tt>p</tt> is of type <tt>AdaptablePredicate</tt> then
<tt>not1(p)</tt> is equivalent to <tt>unary_negate<AdaptablePredicate>(p)</tt>,
but more convenient. This is a global function, not a member
function.
</TD>
</tr>
</table>
<h3>Notes</h3>
<P><A name="1">[1]</A>
Strictly speaking, <tt>unary_negate</tt> is redundant. It can be
constructed using the function object <tt><A href="logical_not.html">logical_not</A></tt> and the
adaptor <tt><A href="unary_compose.html">unary_compose</A></tt>.
<h3>See also</h3>
The <A href="functors.html">function object overview</A>, <A href="AdaptablePredicate.html">Adaptable Predicate</A>, <A href="Predicate.html">Predicate</A>,
<tt><A href="binary_negate.html">binary_negate</A></tt>, <tt><A href="unary_compose.html">unary_compose</A></tt>, <tt><A href="binary_compose.html">binary_compose</A></tt>
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