c++ - 如何根据其成员数据对结构/类数组进行排序？

Question

如何根据其成员数据对结构/类数组进行排序，因为这会失败？

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;                                          

struct O{
    const string n;
    int a=1;
};

bool bfunction (O a, O b) {
    return a.n < b.n; }

int main () {

    O m[]={ {"unta"}, {"jalan"}, {"sama"}, {"aki"} };


// using function in sort control
    sort (m.begin(), m.end(), &bfunction);
}

海湾合作委员会给出:

 error: request for member ‘begin’ in ‘m’, which is of non-class type ‘O [4]’
     sort (m.begin(), m.end(), &bfunction);
             ^~~~~
 error: request for member ‘end’ in ‘m’, which is of non-class type ‘O [4]’
     sort (m.begin(), m.end(), &bfunction);
                        ^~~~~

感谢真诚有用的帮助

Answer 1

使用std::array

#include <iostream>
#include <algorithm>
#include <vector>
#include <array>    

struct O {
    std::string n;
    int a;

    O(const char* c) : a(1) { n = c; }
};

bool bfunction(O a, O b) {
    return a.n < b.n;
}

int main() {
    std::array<O, 4> m = { "unta", "jalan", "sama", "aki" };

    // using function in sort control
    std::sort(m.begin(), m.end(), &bfunction);
}