Standard C++ Library Class Reference

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logical_not

Function Object

Summary

Unary function object that returns true if its argument is false.

Contents

Synopsis●

Description●

Interface●

Warning●

See Also●

Synopsis

#include <functional>

template <class T>

struct logical_not : unary_function<T, bool> ;

Description

logical_not is a unary function object. Its operator() returns true if its argument is false. You can pass

a logical_not object to any algorithm that requires a unary function. For example, the replace_if

algorithm replaces an element with another value if the result of a unary operation is true. logical_not

is used in that algorithm in the following manner:

vector<int> vec1;

void replace_if(vec1.begin(), vec1.end(),