Question

当我将List与pop_back（）一起使用时，我最近遇到了一些麻烦。

首先，我将结构定义如下：

struct Pareto{
    double PCost;
    double PDist;
    double DMax,DMin,DAvg,DStd;
    Pareto(double pCost, double pDist, double dMax, double dMin, double dAvg, double dStd){
        PCost = pCost;
        PDist = pDist;
        DMax=dMax;
        DMin = dMin;
        DAvg = dAvg;
        DStd= dStd;
    }
};

然后我制作了一个Struct列表，如下所示。

list<Pareto> ParetoSet;

奇怪的是，当我使用push_back时没有错误，但是当我使用pop_back时，会发生以下错误。

ParetoSet.pop_back();

错误LNK2019＆amp; LNK1120

“public：class std :: list＆gt; :: _ Const_iterator＆lt; 1＆gt;＆amp; __thiscall std :: list＆gt; :: _ Const_iterator＆lt; 1＆gt; :: operator - （void）”（?? F？$ _ Const_iterator @ $ 00 @？$ list @ UPareto @@ V？$ allocator @ UPareto @@@ std @@@ std @@ QAEAAV012 @XZ）功能

我该如何解决这个问题？

Answer 1

无法重现您的问题。你能跑吗？

#include <iostream>
#include <list>

using namespace std;

struct Pareto{
    double PCost;
    double PDist;
    double DMax,DMin,DAvg,DStd;
    Pareto(double pCost, double pDist, double dMax, double dMin, double dAvg, double dStd){
        PCost = pCost;
        PDist = pDist;
        DMax=dMax;
        DMin = dMin;
        DAvg = dAvg;
        DStd= dStd;
    }

};


ostream& operator<<(ostream& out, Pareto& p) {
    out << "PCost: " << p.PCost << ", PDist: " << p.PDist << ", DMax: " << p.DMax << ", DMin: " << p.DMin << ", DAvg: " << p.DAvg << ", DStd: " << p.DStd;
    return out;
}

int main() {
    list<Pareto> list;
    list.push_back({0, 1, 2, 3, 4, 5});
    list.push_back({0, 10, 20, 30, 40, 50});
    cout << "Initial size: " << list.size() << endl;
    list.pop_back();
    cout << "Size after pop_back: " << list.size() << endl;
    Pareto p = list.back();
    cout << "Left item: " << p;
}

c ++ Struct pop_back错误列表

1 个答案: