less(3C++) - less(3C++)
Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.
NAMEless
- A binary function object that returns true if its first argument is
less than its second.
SYNOPSIS
#include<functional>
template <class T>
struct less : public binary_function<T, T, bool>;
DESCRIPTIONless is a binary function object. Its operator() returns true if x is
less than y. You can pass a less 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. less would be used in that algorithm in
the following manner:
vector<int> vec1;
vector<int> vec2;
vector<int> vecResult;
transform(vec1.begin(), vec1.end(),
vec2.begin(),
vecResult.begin(), less<int>());
After this call to transform, vecResult(n) contains a 1 if vec1(n) was lessthan vec2(n) or a 0 if vec1(n) was greater than or equal to vec2(n).
INTERFACEtemplate <;class T>
struct less : binary_function<;T, T, bool> {
bool operator() (const T&, const T&) const;
};
WARNINGS
If your compiler does not support default template parameters, then you
always need to supply the Allocator template argument. For instance,
you have to write:
vector<int, allocator<int> >
instead of
vector<int>
If your compiler does not support namespaces, then you do not need the
using declaration for std.
SEE ALSO
binary_function, Function_Objects
Rogue Wave Software 02 Apr 1998 less(3C++)
