vjson.hpp

//vov
#ifndef VJSON_HPP
#define VJSON_HPP

#include <iostream>
#include <string>
#include "json.hpp"

using vJson=nlohmann::json;

bool  vJsonFromFile(vJson &json_data,const std::string& fname) {
    std::fstream ifs(fname,std::fstream::in);
    try {
        ifs>>json_data;
    }
    catch(std::exception &e) {
        std::cout<<"["<<__FUNCTION__<<"]"<<e.what()<<"\n";
        ifs.close();
        return false;
    }
    ifs.close();
    return true;
}

bool vJsonToFile(vJson &json_data,const std::string& fname) {
    std::fstream ofs(fname,std::fstream::out);
    try {
        ofs<<json_data.dump(4);
    }
    catch(std::exception &e) {
        std::cout<<"["<<__FUNCTION__<<"]"<<e.what()<<"\n";
        return false;
    }
    ofs.close();
    return true;
}

bool vJsonHasKey(vJson &json_data,const std::string &key) {
    return (json_data.find(key)!=json_data.end())?true:false;
}

#endif

vjson.hpp

原文：https://www.cnblogs.com/smallredness/p/10774989.html