forward_list :: unique()是C++ STL中的内置函数,可从forward_list中删除所有连续的重复元素。它使用二进制谓词进行比较。
句法:
forwardlist_name.unique(BinaryPredicate name)
参数:函数接受一个参数,该参数是一个二进制谓词,如果元素应被视为相等,则返回true。它具有以下语法:
bool name(data_type a, data_type a)
返回值:该函数不返回任何内容。
// C++ program to illustrate the
// unique() function
#include
using namespace std;
// Function for binary_predicate
/*bool compare(int a, int b)
{
return (abs(a) == abs(b));
}
// This function can also be used and passed inside
// unique(), to get the same result
*/
int main()
{
forward_list list = { 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 2, 4, 4 };
cout << "List of elements before unique operation is: ";
// starts from the first element of the list to the last
for (auto it = list.begin(); it != list.end(); ++it)
cout << *it << " ";
// unique operation on forward list
list.unique();
cout << "\nList of elements after unique operation is: ";
// starts from the first element of the list to the last
for (auto it = list.begin(); it != list.end(); ++it)
cout << *it << " ";
return 0;
}
输出:
List of elements before unique operation is: 1 1 1 1 2 2 2 2 3 3 3 2 4 4
List of elements after unique operation is: 1 2 3 2 4
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