Use the set::find STL function in Visual C++
This article illustrates how to use the set::find
Standard Template Library (STL) function in Visual C++.
Original product version: Visual C++
Original KB number: 158576
Required header
<set>
Prototype
template<class _K, class _Pr, class _A>
class set
{
public:
// Function 1:
const_iterator find(const _K& _Kv) const;
}
Note
The class/parameter names in the prototype may not match the version in the header file. Some have been modified to improve readability.
Description of the set::find function
The find
function is used to locate an element in a controlled sequence. It returns an iterator to the first element in the controlled sequence whose sort key matches its parameter. If no such element exists, the returned iterator equals end()
.
Sample code
Note
In Visual C++ .NET and in Visual C++, /EHsc is set by default and is equivalent to /GX.
//////////////////////////////////////////////////////////////////////
// Compile options needed: -GX
// SetFind.cpp:
// Illustrates how to use the find function to get an iterator
// that points to the first element in the controlled sequence
// that has a particular sort key.
// Functions:
// find Returns an iterator that points to the first element
// in the controlled sequence that has the same sort key
// as the value passed to the find function. If no such
// element exists, the iterator equals end().
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
//////////////////////////////////////////////////////////////////////
#pragma warning(disable:4786)
#include <set>
#include <iostream>
#if _MSC_VER > 1020 // if VC++ version is > 4.2
using namespace std; // std c++ libs implemented in std
#endif
typedef set<int,less<int>,allocator<int> > SET_INT;
void truefalse(int x)
{
cout << (x?"True":"False") << endl;
}
void main()
{
SET_INT s1;
cout << "s1.insert(5)" << endl;
s1.insert(5);
cout << "s1.insert(8)" << endl;
s1.insert(8);
cout << "s1.insert(12)" << endl;
s1.insert(12);
SET_INT::iterator it;
cout << "it=find(8)" << endl;
it=s1.find(8);
cout << "it!=s1.end() returned ";
truefalse(it!=s1.end()); // True
cout << "it=find(6)" << endl;
it=s1.find(6);
cout << "it!=s1.end() returned ";
truefalse(it!=s1.end()); // False
}
Program output
s1.insert(5)
s1.insert(8)
s1.insert(12)
it=find(8)
it!=s1.end() returned True
it=find(6)
it!=s1.end() returned False
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