错误显示:

request for member 'begin', 'end' in 'arr' which is non class type int[5], unable to deduce from expression error.

我的代码:

#include <iostream>
using namespace std;

int main()
{
    int * mypointer;

    int arr[5] = {1,3,5,7,9};

    mypointer = arr;

    for(auto it = arr.begin(); it != arr.end(); ++it) {
        cout<<*mypointer<<endl;

        mypointer++;
    }

    return 0;
}

最佳答案

数组没有成员函数，因为它们不是类类型。这就是错误的意思。

您可以使用 std::begin(arr)和 std::end(arr)来自 <iterator>而是标题。这也适用于 确实 具有 .begin() 的类型和 .end()成员，通过重载:

#include <array>
#include <vector>

#include <iterator>

int main()
{
    int c_array[5] = {};
    std::array<int, 5> cpp_array = {};
    std::vector<int> cpp_dynarray(5);

    auto c_array_begin = std::begin(c_array); // = c_array + 0
    auto c_array_end = std::end(c_array);     // = c_array + 5

    auto cpp_array_begin = std::begin(cpp_array); // = cpp_array.begin()
    auto cpp_array_end = std::end(cpp_array);     // = cpp_array.end()

    auto cpp_dynarray_begin = std::begin(cpp_dynarray); // = cpp_dynarray.begin()
    auto cpp_dynarray_end = std::end(cpp_dynarray);     // = cpp_dynarray.end()
}

https://stackoverflow.com/questions/14595285/