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  • STL中的equal函数

    STL中的equal函数:

    template<class InputIterator1, class InputIterator2>
    bool equal( InputIterator1 _First1, InputIterator1 _Last1, InputIterator2 _First2 ); template<class InputIterator1, class InputIterator2, class BinaryPredicate> bool equal( InputIterator1 _First1, InputIterator1 _Last1, InputIterator2 _First2, BinaryPredicate _Comp );
    View Code
     1 // alg_equal.cpp
     2 // compile with: /EHsc
     3 #include <vector>
     4 #include <algorithm>
     5 #include <iostream>
     6 
     7 // Return whether second element is twice the first
     8 bool twice ( int elem1, int elem2 )
     9 {
    10    return elem1 * 2 == elem2;
    11 }
    12 
    13 int main( )
    14 {
    15    using namespace std;
    16    vector <int> v1, v2, v3;
    17    vector <int>::iterator Iter1, Iter2, Iter3;
    18 
    19    int i;
    20    for ( i = 0 ; i <= 5 ; i++ )
    21    {
    22       v1.push_back( 5 * i );
    23    }
    24 
    25    int ii;
    26    for ( ii = 0 ; ii <= 5 ; ii++ )
    27    {
    28       v2.push_back( 5 * ii );
    29    }
    30 
    31    int iii;
    32    for ( iii = 0 ; iii <= 5 ; iii++ )
    33    {
    34       v3.push_back( 10 * iii );
    35    }
    36    
    37    cout << "v1 = ( " ;
    38    for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
    39       cout << *Iter1 << " ";
    40    cout << ")" << endl;
    41 
    42    cout << "v2 = ( " ;
    43    for ( Iter2 = v2.begin( ) ; Iter2 != v2.end( ) ; Iter2++ )
    44       cout << *Iter2 << " ";
    45    cout << ")" << endl;
    46 
    47    cout << "v3 = ( " ;
    48    for ( Iter3 = v3.begin( ) ; Iter3 != v3.end( ) ; Iter3++ )
    49       cout << *Iter3 << " ";
    50    cout << ")" << endl;
    51 
    52    // Testing v1 and v2 for equality under identity
    53    bool b;
    54    b = equal( v1.begin( ), v1.end( ), v2.begin( ) );
    55 
    56    if ( b )
    57       cout << "The vectors v1 and v2 are equal under equality."
    58            << endl;
    59    else
    60       cout << "The vectors v1 and v2 are not equal under equality."
    61            << endl;
    62 
    63    // Testing v1 and v3 for equality under identity
    64    bool c;
    65    c = equal( v1.begin( ), v1.end( ), v3.begin( ) );
    66 
    67    if ( c )
    68       cout << "The vectors v1 and v3 are equal under equality."
    69            << endl;
    70    else
    71       cout << "The vectors v1 and v3 are not equal under equality."
    72            << endl;
    73 
    74    // Testing v1 and v3 for equality under twice
    75    bool d;
    76    d = equal( v1.begin( ), v1.end( ), v3.begin( ), twice );
    77 
    78    if ( d )
    79       cout << "The vectors v1 and v3 are equal under twice."
    80            << endl;
    81    else
    82       cout << "The vectors v1 and v3 are not equal under twice."
    83            << endl;
    84 }
    85  
    86 /*
    87 Output
    88   
    89 v1 = ( 0 5 10 15 20 25 )
    90 v2 = ( 0 5 10 15 20 25 )
    91 v3 = ( 0 10 20 30 40 50 )
    92 The vectors v1 and v2 are equal under equality.
    93 The vectors v1 and v3 are not equal under equality.
    94 The vectors v1 and v3 are equal under twice.
    95  */
     
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  • 原文地址:https://www.cnblogs.com/cchun/p/2544020.html
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