.\" ident @(#)greater.3
.\" Standard Template Library
.\" $$RW_INSERT_HEADER "slyrs.man"
.TH greater 3C++ "02 Apr 1998" "Rogue Wave Software" "-"
.ce2
Standard C++ Library   
Copyright 1998, Rogue Wave Software, Inc.   

.SH NAME

\f2greater\fP

\ - A binary function object that returns \f2true\fP if its first argument is greater than its second.



.SH  SYNOPSIS


.br
#include <functional>
.br
template <class T>
.br
struct greater : binary_function<T, T, bool> {
.RE
.RS 1
bool operator() (const T&, const T&) const;
.RE
.RS 0
};



.SH  DESCRIPTION


greater is a binary function object. Its \f2operator()\fP returns \f2true\fP if \f2x\fP is greater than \f2y\fP. You can pass a greater object to any algorithm that requires a binary function. For example, the transform algorithm applies a binary operation to corresponding values in two collections and stores the result of the function. greater would be used in that algorithm in the following manner:


.br
vector<int> vec1;
.br
vector<int> vec2;
.br
vector<int> vecResult;
.br
.
.br
.
.br
.
.br
transform(vec1.begin(), vec1.end(),
.RE
.RS 9
vec2.begin(), vecResult.begin(), greater<int>());



.SH  WARNINGS


After this call to transform, \f2vecResult(n)\fP contains a \f21\fP if \f2vec1(n)\fP was greater than \f2vec2(n)\fP or a \f20\fP if \f2vec1(n)\fP was less than or equal to \f2vec2(n)\fP.

If your compiler does not support default template parameters, then you always need to supply the \f2Allocator\fP template argument. For instance, you have to write:

\f2vector<int, allocator<int> >\fP

instead of 

\f2vector<int>\fP

If your compiler does not support namespaces, then you do not need the using declaration for \f2std\fP.



.SH  SEE ALSO


Function_Objects