具有自定义比较功能的std :: sort函数导致错误:必须调用对非静态成员函数的引用 [英] std::sort function with custom compare function results error: reference to non-static member function must be called

问题描述

在类中定义std :: sort函数和自定义比较函数时遇到麻烦.

I have trouble using the std::sort function with my custom comparison function when defined inside a class.

class Test {
    private:
        vector< vector<int> > mat;
        bool compare(vector<int>, vector<int>);
    public:
        void sortMatrix();
}

bool Field::compare( vector<int> a, vector<int> b) {
    return (a.back() < b.back());
}

void Test::sortMatrix() {
    sort(vec.begin(), vec.end(), compare);
}

我收到以下错误消息:

error: reference to non-static member function must be called
        sort(vec.begin(), vec.end(), compare);
                                     ^~~~~~~

但是当我在main.cpp文件中没有任何类的情况下定义compare()和sortMatrix()时，一切正常.我将不胜感激.

When I however define compare() and sortMatrix() in the file main.cpp without any class, everything works fine. I would appreciate any help and suggestions.

推荐答案

Make your comparator function static. It will work.

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