/* Someone please help me. As C++ is not a po- pular programming language, it is hard to find courses for advanced C++ learners. I am learning how to use std::async but to no avail. There are very few tutorials on this topic on YouTube. I am also having problems with this annoyi- ng << operator overloading function. Please help T_T. Also, you cannot compile this using SL bec- ause "windows.h" is not supported. Use Cxx droid or CodeBlocks or some other non-web compiler */ #include #include #include #include #include #include #include #include using namespace std; //coloured text class //only focus at the << overloading friend function class fancy{ public: //where actions will be performed on string content; //constructor fancy(string R="",string c="white"){ content = R; int *flag = new int; *flag = 0; for (int i=0;i<16;i++){ if (c==colors[i]){ _color = i;*flag = 1; break; } } if (*flag==0) _color = 15; delete flag; _color++; } //destructor ~fancy(){ } //find out length const int length(){ return content.length(); } //similar to "std::substr()" method fancy substr(int _start, int _end){ fancy res("",colors[_color]); res.content = content.substr(_start,_end); return res; } //change color of string on console void setColor(string c){ int *flag = new int; *flag = 0; for (int i=0;i<16;i++){ if (c==colors[i]){ _color = i;*flag = 1; break; } } if (*flag==0) _color = 15; delete flag; _color++; } //all operator overloading methods //here fancy operator +(fancy&); void operator +=(fancy&); void operator *=(int num){ string accum; for (int i=1;icontent = p; } string operator[](int _index); fancy operator*(int num); //problem here /* I tried to do friend ostream operator& << (ostream &output, fancy &p); but it gives errors as it said : "ostream was already destructed" */ friend fancy operator << (ostream &output, fancy &p); friend fancy operator >> (ostream &input, fancy &p); private: static HANDLE h; static string colors[16]; int _color; }; string fancy::operator[](int _index){ string res; stringstream ss; //convert char to string ss << content[_index]; ss >> res; return res; } //cout << overloading fancy operator << (ostream &output, fancy &p){ SetConsoleTextAttribute(fancy::h,p._color); output << p.content; SetConsoleTextAttribute(fancy::h,15); return p; } //cin >> fancy operator >> (istream &input, fancy &p){ input >> p.content; return p; } void fancy::operator+=(fancy &A){ this->content += A.content; } fancy fancy::operator*(int num){ fancy res("",colors[_color-1]); for (int i=0;icontent+A.content; return res; } void fancy::operator+=(string p){this->content+=p;} fancy fancy::operator+(string p){ fancy res(this->content+p); return res; } //static objects. Ignore them HANDLE fancy::h = GetStdHandle(STD_OUTPUT_HANDLE); string fancy::colors[16] = {"blue","darkgreen","cyan","crimson","pink","darkyellow","lightgrey","grey","navyblue","green","cyan","red","magenta","yellow","white"}; //mutex object //I dont fucking know what does this do mutex mu; //function for printing the images void printImage(vector> *img,int height){ int width = img[0].size(); //make sure the array cannot be accessed more than once at the same time lock_guard lock(mu); //iterate through every pixel for (int i=0;i> cccp = { {b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b}, {b,b,R,R,R,b,b,b,R,R,R,b,b,b,R,R,R,b,b,R,R,R,R,R}, {b,R,R,b,b,R,b,R,R,b,b,R,b,R,R,b,b,R,b,R,b,b,b,R}, {b,R,R,b,b,b,b,R,R,b,b,b,b,R,R,b,b,b,b,R,b,b,b,R}, {b,R,R,b,b,b,b,R,R,b,b,b,b,R,R,b,b,b,b,R,R,R,R,R}, {b,R,R,b,b,R,b,R,R,b,b,R,b,R,R,b,b,R,b,R,b,b,b,b}, {b,b,R,R,R,b,b,b,R,R,R,b,b,b,R,R,R,b,b,R,b,b,b,b}, {b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b,b} }; //image 2 vector> sovietFlag = { {r,r,r,r,r,r,r,r,r,r}, {r,r,r,y,r,r,r,r,r,r}, {r,r,y,y,y,r,y,r,r,r}, {r,y,y,y,r,r,r,y,r,r}, {r,r,y,r,y,r,r,y,r,r}, {r,r,r,r,r,y,r,y,r,r}, {r,r,r,y,r,r,y,y,r,r}, {r,r,y,r,y,y,y,y,r,r}, {r,y,r,r,r,r,r,r,y,r}, {r,r,r,r,r,r,r,r,r,r} }; //collection of all images vector>> images; //I dont know what the actual fuck is this vector is for vector> m_Futures; //append images images.push_back(cccp); images.push_back(sovietFlag); //create thread for each image for (const auto&image:images){ m_Futures.push_back(async(launch::async,printImage,image,image.size())); } //I am not so sure if this gives errors for (const auto&fut:m_Futures){ //activate thread? fut.get(); } return 0; }

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