5. Storage system API.cpp

#include <iostream>
#include <string>
#include <curl/curl.h>

// Callback function writes data to a std::string
size_t WriteCallback(void* contents, size_t size, size_t nmemb, std::string* s) {
    size_t newLength = size*nmemb;
    size_t oldLength = s->size();
    try {
        s->resize(oldLength + newLength);
    } catch(std::bad_alloc &e) {
        // handle memory problem
        return 0;
    }

    std::copy((char*)contents,(char*)contents+newLength,s->begin()+oldLength);
    return size*nmemb;
}

// Function to upload an object
void uploadObject(const std::string& url, const std::string& objectData) {
    CURL* curl;
    CURLcode res;

    curl_global_init(CURL_GLOBAL_DEFAULT);
    curl = curl_easy_init();

    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
        curl_easy_setopt(curl, CURLOPT_READDATA, &objectData);
        curl_easy_setopt(curl, CURLOPT_READFUNCTION, &WriteCallback);

        res = curl_easy_perform(curl);

        if(res != CURLE_OK) {
            std::cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << std::endl;
        }

        curl_easy_cleanup(curl);
    }

    curl_global_cleanup();
}

int main() {
    std::string url = "http://example.com/api/object";
    std::string objectData = "Hello, World!";
    uploadObject(url, objectData);
    return 0;
}