这个错误如何修改？ - 编程论坛

rjsp2021-01-08 19:25

当然，整段代码都不是C++风格，这是半路转行C++的C程序员的通病

程序代码：

#include <iostream>
#include <string>

class Stock
{
public:
    explicit Stock( std::string co, int total=0, double gat=0.0 );

private:
    std::string co_;
    int total_;
    double gat_;

    friend bool operator<( const Stock& lhs, const Stock& rhs ) noexcept;
    friend std::ostream& operator<<( std::ostream& os, const Stock& s );
};

Stock::Stock( std::string co, int total, double gat ) : co_(std::move(co)), total_(total), gat_(gat)
{
}

bool operator<( const Stock& lhs, const Stock& rhs ) noexcept
{
    return lhs.total_ < rhs.total_;
}

std::ostream& operator<<( std::ostream& os, const Stock& s )
{
    return os << s.co_ << '\n' << s.total_ << '\n' << s.gat_;
}

#include <algorithm>
using namespace std;

int main( void )
{
    Stock s[] = {
        Stock("skg",    4, 7.7),
        Stock("skgjg",  5, 3.9),
        Stock("irgnj", 33, 5.7),
        Stock("eiur",   4, 5.7)
    };

    auto itor = max_element( begin(s), end(s) );
    cout << *itor << endl;
}