std::ifstream ifile(argv[1]);

    std::string input((std::istreambuf_iterator<char>(ifile)),
                      (std::istreambuf_iterator<char>()     ));

    Terminal(std::string input):_input(input) {
        std::regex re("(\n|\r)+");
        input = std::regex_replace(input, re, " ");
    }    

class Rectangle: public Shape {
public:
    Rectangle(std::string id, double length, double width): Shape(id), _length(length), _width(width) {
    }

class Shape {
  protected:
    string _id;
    string _color; 

  public:
    Shape(string id): _id(id), _color("white"){};
    Shape(string id, string color): _id(id), _color(color){};
    }
    
class Rectangle: public Shape {

  protected:
    double _width, _height;

  public:

    Rectangle(string id , double width, double height ):  Shape(id), _width(width), _height(height) {
        _id=id;
        _color="white";
        }

    Rectangle(string id , double width, double height, string color): Shape(id), Shape(color), _width(width), _height(height) {
        _id=id;
        _color=color;
        }

jerry@LAPTOP-4VVBP80S:/mnt/d/NTUT/POSD/109598061_HW$ make test
g++ -Werror test/ut_main.cpp -o bin/ut_main -lgtest -lpthread
In file included from test/ut_rectangle.h:1:0,
                 from test/ut_main.cpp:2:
test/../src/rectangle.h: In constructor ‘Rectangle::Rectangle(std::__cxx11::string, double, double, std::__cxx11::string)’:
test/../src/rectangle.h:22:5: error: multiple initializations given for base ‘Shape’
     Rectangle(string id , double width, double height, string color): Shape(id), Shape(color), _width(width), _height(height) {
     ^~~~~~~~~
makefile:15: recipe for target 'ut_main' failed
make: *** [ut_main] Error 1

void deleteShapeById(std::string id) {
    for( std::vector<Shape *>::iterator ptr=_shapes.begin ; ptr<_shapes.end ; ptr++){
        if(ptr.id()==id){
            _shapes.erase( ptr , ptr+1 );
        }
        else(ptr.color()=="transparent"){
            ptr.deleteShapeById(id);
        }
    }
}

void deleteShapeById(std::string id) {
    for( std::vector<Shape *>::iterator ptr = _shapes.begin ; ptr != _shapes.end ; ptr++){
        if(ptr.id() == id) {
            _shapes.erase( ptr );
        } else {
            try {
                ptr.deleteShapeById(id);
                return;
            } catch (std::string e) {
            }
        }
    }
    throw "error";
}

mkdir -p bin
#mkdir -p obj
g++ -std=c++11 -Wfatal-errors test/ut_main.cpp -o bin/ut_main -lgtest -lpthread
/usr/bin/ld: /tmp/ccOAnkAY.o: in function `Shape::Shape(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
ut_main.cpp:(.text._ZN5ShapeC2ENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN5ShapeC5ENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x27): undefined reference to `vtable for Shape'
/usr/bin/ld: /tmp/ccOAnkAY.o: in function `Shape::~Shape()':
ut_main.cpp:(.text._ZN5ShapeD2Ev[_ZN5ShapeD5Ev]+0x13): undefined reference to `vtable for Shape'
/usr/bin/ld: /tmp/ccOAnkAY.o:(.data.rel.ro._ZTI8Triangle[_ZTI8Triangle]+0x10): undefined reference to `typeinfo for Shape'
/usr/bin/ld: /tmp/ccOAnkAY.o:(.data.rel.ro._ZTI7Ellipse[_ZTI7Ellipse]+0x10): undefined reference to `typeinfo for Shape'
/usr/bin/ld: /tmp/ccOAnkAY.o:(.data.rel.ro._ZTI9Rectangle[_ZTI9Rectangle]+0x10): undefined reference to `typeinfo for Shape'
collect2: error: ld returned 1 exit status
make: *** [makefile:12: ut_main] Error 1

class Shape
{
private:
    string _id, _color;

public:
    Shape(std::string id) : _id(id), _color("white"){};                  // interface for default color "white".
    Shape(std::string id, std::string color) : _id(id), _color(color){}; // interface for color input by user.
    std::string id() const;                                              // return id of shape.
    std::string color() const;                                           // return color of shape.

    virtual double area() const = 0;
    virtual double perimeter() const = 0;
    virtual string info() const = 0;

    virtual void addShape(Shape *shape);          // throw std::string "Only compound shape can add shape!"
    virtual void deleteShapeById(std::string id); // throw std::string "Only compound shape can delete shape!"
    virtual Shape *getShapeById(std::string id);  // throw std::string "Only compound shape can get shape!"
    ~Shape(){};
};

我才剛開始，還沒建compound shape
只在shape裡面加了這次要改的virtual function跟建構元
以及改了Rectangle Ellipse Triangle建構元
還有unit test的呼叫部分，呼叫的參數加了"0"，就醬

這是改過的Rectangle建構元

Rectangle(string id, double length, double width) : Shape(id), _length(length), _width(width)
{
    if (length <= 0 || width <= 0)
        throw string("This is not a rectangle!");
    // no need
    //_id = id;
    //_color = "white";
}
Rectangle(string id, double length, double width, string color) : Shape(id, color), _length(length), _width(width)
{
    // If the rectangle can't be successfully created,
    // handle the exception by throwing string "This is not a rectangle!"
    if (length <= 0 || width <= 0)
        throw string("This is not a rectangle!");
    //_length = length;
    //_width = width;
    //_id = id;
    //_color = color;
}