vector::operator==
Illustre comment utiliser la fonction de bibliothèque de types (STL) Standard de vecteur : : operator== dans Visual C++.
template<class _TYPE, class _A> inline
bool operator==(
const vector<_TYPE, _A>& _X,
const vector<_TYPE, _A>& _Y
);
Notes
[!REMARQUE]
Les noms de classes/paramètre dans le prototype ne correspondent pas à la version du fichier d'en-tête.certains ont été modifiés pour améliorer la lisibilité.
L'exemple déclare trois vecteurs vides d'une classe définie par l'utilisateur appelée ID, qui contient un membre de chaîne de nom et un membre d'entier de note.Elle crée trois vecteurs des identificateurs puis compare des vecteurs à l'aide de operator== comme défini pour l'ID.
Exemple
// Opequal.cpp
// compile with: /EHsc
// Illustrates how to define the operator== to compare vectors.
//
// Functions:
//
// vector::operator== - Vector equality comparison.
// vector::push_back - Appends (inserts) an element to the end of a
// vector, allocating memory for it if necessary.
//
//////////////////////////////////////////////////////////////////////
// The debugger can't handle symbols more than 255 characters long.
// STL often creates symbols longer than that.
// When symbols are longer than 255 characters, the warning is disabled.
#pragma warning(disable:4786)
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std ;
using namespace std::rel_ops ;
// The ID class is used for team scoring. It holds each player's name
// and score.
class ID
{
public:
string Name;
int Score;
ID() : Name(""), Score(0) {}
ID(string NewName, int NewScore) : Name(NewName), Score(NewScore) {}
};
// In this example, an ID is equivalent only if both name and score match.
bool operator==(const ID& x, const ID& y)
{
return (x.Name == y.Name) && (x.Score == y.Score);
}
// IDs will be sorted by Score, not by Name.
bool operator<(const ID& x, const ID& y)
{
return x.Score < y.Score;
}
// Define a template class for a vector of IDs.
typedef vector<ID> NAMEVECTOR;
int main()
{
// Declare 3 dynamically allocated vectors of names.
NAMEVECTOR Vector1, Vector2, Vector3;
// Create 3 short vectors of names.
Vector1.push_back(ID("Karen Palmer", 2));
Vector1.push_back(ID("Ada Campbell", 1));
Vector2.push_back(ID("John Woloschuk", 3));
Vector2.push_back(ID("Grady Leno", 2));
Vector3.push_back(ID("Karen Palmer", 2));
Vector3.push_back(ID("Ada Campbell", 1));
// Compare Vector1 to Vector2 and show whether they're equivalent.
Vector1 == Vector2 ? cout << "Vector1 == Vector2"
: cout << "Vector1 != Vector2";
cout << endl;
// Compare Vector1 to Vector3 and show whether they're equivalent.
Vector1 == Vector3 ? cout << "Vector1 == Vector3"
: cout << "Vector1 != Vector3";
cout << endl;
}
Configuration requise
en-tête : <vector>