C++ : Create Same BasicIO Functions For Cross-platform Compatibility

I write a few file IO functions which are used in windows and mac os x.

bool CopyAFile(const std::string inFile, const std::string outFile);
bool RemoveFile(const std::string filePath);
void RemoveDir(const std::string folderPath);
void MoveAFile(const std::string oldFile, const std::string newFile);
void CheckFolderExist(const std::string folderPath);
bool FileExists( const std::string path );
void HandleLastSlash( std::string &path );

The basic IO interfaces on windows OS and Unix OS are different. I import dirent.h from github – tronkko for same code in BasicIO::RemoveDir.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

project(basicIO)

# =========== turn on C++17 ===========
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

if ( CMAKE_SYSTEM_NAME MATCHES "Windows" )
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++lastest")
else ()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std:c++lastest")
endif()
# =========== finish: turn on C++17 ===========

add_executable(${PROJECT_NAME} "main.cpp" "BasicIO.h" "BasicIO.cpp" "dirent_win.h" "log.hpp")

BasicIO.h

#ifndef BASICIO_H
#define BASICIO_H

#include <string>

class BasicIO
{
public:
    static bool CopyAFile(const std::string inFile, const std::string outFile);
    static bool RemoveFile(const std::string filePath);
    static void RemoveDir(const std::string folderPath);
    static void MoveAFile(const std::string oldFile, const std::string newFile);
    static void CheckFolderExist(const std::string folderPath);
    static bool FileExists( const std::string path );
    static void HandleLastSlash( std::string &path );
};

#endif // BASICIO_H

BasicIO.cpp

#include "BasicIO.h"
#include "log.hpp"

#ifdef WIN32
#include "dirent_win.h"
#else
#include <locale.h>
#include <fstream>
#include <unistd.h>
#endif

#include <fstream>
#include <direct.h>
#include <stdio.h>
#include <filesystem>

bool BasicIO::CopyAFile(const std::string inFile, const std::string outFile)
{
    if ( !FileExists( inFile.c_str() ) )
    {
        Log( IError, "file doesn't exist ", inFile );
        return false;
    }
    std::ifstream  src(inFile, std::ios::binary);
    std::ofstream  dst(outFile, std::ios::binary);
    dst << src.rdbuf();
    return true;
}

bool BasicIO::RemoveFile(const std::string filePath)
{
    if ( !FileExists( filePath.c_str() ) )
    {
        return true;
    }
    if( 0 == remove( filePath.c_str() ) )
    {
        return true;
    }
    return false;
}

void BasicIO::RemoveDir(const std::string folderPath)
{
    struct dirent *entry;
    DIR *dir = opendir(folderPath.c_str());
    if (nullptr == dir)
    {
        return ;
    }
    while (nullptr != (entry = readdir(dir)))
    {
        std::string _folderPath = folderPath;
        HandleLastSlash(_folderPath);

        std::string childPath = _folderPath + "/" + entry->d_name;
        HandleLastSlash( childPath );

        if( strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0 ||
            strcmp(entry->d_name, "./") == 0 || strcmp(entry->d_name, "../") == 0 )
        {
            continue;
        }
        if( DT_DIR == entry->d_type )
        {
            RemoveDir( childPath.c_str() );
        }
        else
        {
            RemoveFile( childPath.c_str() );
        }
    }
    rmdir( folderPath.c_str() );
    closedir(dir);
}

void BasicIO::MoveAFile(const std::string oldFile, const std::string newFile)
{
    if ( FileExists( oldFile ) )
    {
        CopyAFile( oldFile.c_str(), newFile.c_str() );
        if (oldFile != newFile)
        {
            RemoveFile( oldFile.c_str() );
        }
    }
}

void BasicIO::CheckFolderExist(const std::string folderPath)
{
    if( !FileExists(folderPath) )
    {
        Log( IInfo, "create folder: ", folderPath );
        mkdir( folderPath.c_str() );
    }
}

/*
*   Checks if the given file status or path corresponds to an existing file or directory.
*/
bool BasicIO::FileExists(const std::string path)
{
    return std::filesystem::exists( path.c_str() );

    // C++
    //std::ifstream file( path.c_str() );
    //return file.good();

    /* fast way
    FILE * fp = fopen(path.c_str(), "r");
    if (fp != nullptr)
    {
        fclose(fp);
        return true;
    }
    return false; */
}

void BasicIO::HandleLastSlash(std::string &path)
{
    while ( path[path.size()-1] == '/' ) {
        path = path.substr( 0, path.size()-1 );
    }
    while ( path[path.size()-1] == '\\' ) {
        path = path.substr( 0, path.size()-1 );
    }
}

main.cpp

#include <iostream>
#include "BasicIO.h"

using namespace std;

int main(int argc, char *argv[])
{
    auto folderPath = argv[1];
    BasicIO::RemoveDir( folderPath );
    return 0;
}

All source code:
GitHub – basicIO