c ++中按修改时间对文件进行排序 [英] file sort in c++ by modification time

问题描述

如何在C ++中按修改时间对文件排序?

How to sort a file by modification time in C++?

std::sort需要比较功能.
它以向量为参数.我想根据修改对文件进行排序. 我已经可以使用比较功能或API来实现此目的了吗?

std::sort needs a comparison function.
It takes vector as the arguments. I want to sort files based on modification. Is there already a comparison function or API available that I can use to achieve this?

推荐答案

是的，您可以使用std::sort并告诉它使用自定义比较对象，如下所示:

Yes, you can use std::sort and tell it to use a custom comparison object, like this:

#include <algorithm>

std::vector<string> vFileNames;
FileNameModificationDateComparator myComparatorObject;
std::sort (vFileNames.begin(), vFileNames.end(), myComparatorObject);

FileNameModificationDateComparator类的代码(可以使用简短的名称):

The code for the FileNameModificationDateComparator class (feel free to use a shorter name):

#include <sys/stat.h>
#include <unistd.h> 
#include <time.h>   

/*
* TODO: This class is OS-specific; you might want to use Pointer-to-Implementation 
* Idiom to hide the OS dependency from clients
*/
struct FileNameModificationDateComparator{
    //Returns true if and only if lhs < rhs
    bool operator() (const std::string& lhs, const std::string& rhs){
        struct stat attribLhs;
        struct stat attribRhs;  //File attribute structs
        stat( lhs.c_str(), &attribLhs);
        stat( rhs.c_str(), &attribRhs); //Get file stats                        
        return attribLhs.st_mtime < attribRhs.st_mtime; //Compare last modification dates
    }
};

此处的统计结构定义，以防万一.

警告:我没有检查此代码

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