给定两个绝对路径 A 和 B，如何获取从 A 到 B 的相对路径

您可以使用：std::filesystem::relative

#include <iostream>
#include <filesystem>

int main() {
    auto p = std::filesystem::relative("a/b/c/d","a/b/x/y");
    std::cout << p;
}

输出：

"../../c/d"

没有文件系统：

#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <iterator>

using namespace std;

template <typename out>
void split( const std::string &s, char delimeter, out result ) {
    std::istringstream iss( s );
    std::string item;
    while( std::getline( iss, item, delimeter ) ) {
        *result++ = item;
    }
}

std::vector<std::string> split( const std::string &s, char delimeter ) {
    std::vector<std::string> elems;
    split( s, delimeter, std::back_inserter( elems ) );
    return elems;
}

int main() {
    string source_file = "C:/AA/BB/EE/source.cpp";
    string header_file = "C:/AA/CC/DD/header.h";
    string include = "";
    string extra = "";
    std::vector<std::string> cpp = split( source_file, '/' );
    std::vector<std::string> hpp = split( header_file, '/' );
    std::vector<std::string>::iterator c = cpp.begin();
    std::vector<std::string>::iterator h = hpp.begin();
    while( *h == *c && *c != *cpp.end()  && *h != *hpp.end() ) {
        h++;
        c++;
    }
    while( *c != *cpp.end() ) {
        if( *c != *cpp.rbegin() ) {
            include += "../";
        }
        c++;
    }
    while( *h != *hpp.end() ) {
        if( *h == *hpp.rbegin() ) {
            include += extra;
            include += *hpp.rbegin();
        } else {
            extra += *h;
            extra += "/";
        }
        h++;
    }
    std::cout << include << endl;
}

但就我个人而言，我更喜欢，+1 for @ 463035818_is_not_an_aistd::filesystem::relative