STD:：C++中的等式（）-yiteyi-C++库

std:：equal（） 帮助比较范围[first_1，last_1]内的元素与从first_2开始的范围内的元素。 语法1：

null

template 
  bool equal (InputIterator1 first1, InputIterator1 last1,
              InputIterator2 first2)
	
first_1, last_1 : Initial and final positions of the first
    sequence. All the elements are present within a range [first_1,last_1)
first2 : Initial position of the second sequence.

Returns : 
true, if all of the elements in both ranges match; otherwise false

                     // C++ program illustrating                   
                     // use of  bool equal (InputIterator1 first1, InputIterator1 last1,                   
                     // InputIterator2 first2)                   
                             
                             
                     #include <bits/stdc++.h>                   
                             
                     int                               main()                   
                     {                   
                                         int                               v1[] = { 10, 20, 30, 40, 50 };                   
                                         std::vector<                               int                               > vector_1 (v1, v1 +                               sizeof                               (v1) /                               sizeof                               (                               int                               ) );                   
                             
                                         // Printing vector1                   
                                         std::cout <<                               "Vector contains : "                               ;                   
                                         for                               (unsigned                               int                               i = 0; i < vector_1.size(); i++)                   
                                         std::cout <<                               " "                               << vector_1[i];                   
                                         std::cout <<                               ""                               ;                   
                             
                                         // using std::equal()                   
                                         // Comparison within default constructor                   
                                         if                               ( std::equal (vector_1.begin(), vector_1.end(), v1) )                   
                                         std::cout <<                               "The contents of both sequences are equal."                               ;                   
                                         else                   
                                         printf                               (                               "The contents of both sequences differ."                               );                   
                             
                     }                   

输出：

Vector contains :  10, 20, 30, 40, 50
The contents of both sequences are equal.

语法2：

template 
  bool equal (InputIterator1 first1, InputIterator1 last1,
              InputIterator2 first2, BinaryPredicate pred);

first_1, last_1 : Initial and final positions of the first
    sequence. All the elements are present within a range [first_1,last_1)
first2 : Initial position of the second sequence.
pred : Binary function that accepts two elements as argument 
      and returns a value convertible to boolean.

Returns : 
true, if all of the elements in both ranges match; otherwise false

                     // C++ program illustrating                   
                     // use of bool equal (InputIterator1 first1, InputIterator1 last1,                   
                     // InputIterator2 first2, BinaryPredicate pred);                   
                             
                     #include <bits/stdc++.h>                   
                             
                     bool                               pred(                               int                               i,                               int                               j)                   
                     {                   
                                         return                               (i != j);                   
                     }                   
                             
                     int                               main()                   
                     {                   
                                         int                               v1[] = { 10, 20, 30, 40, 50 };                   
                                         std::vector<                               int                               > vector_1 (v1, v1 +                               sizeof                               (v1) /                               sizeof                               (                               int                               ) );                   
                             
                                         // Printing vector1                   
                                         std::cout <<                               "Vector contains : "                               ;                   
                                         for                               (unsigned                               int                               i = 0; i < vector_1.size(); i++)                   
                                         std::cout <<                               " "                               << vector_1[i];                   
                                         std::cout <<                               ""                               ;                   
                             
                                         // using std::equal()                   
                                         // Comparison based on pred                   
                                         if                               ( std::equal (vector_1.begin(), vector_1.end(), v1, pred) )                   
                                         std::cout <<                               "The contents of both sequences are equal."                               ;                   
                                         else                   
                                         printf                               (                               "The contents of both sequences differ."                               );                   
                             
                     }                   

输出：

Vector contains :  10, 20, 30, 40, 50
The contents of both sequences differ.

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