No matching constructor for initialization of 'type'

Question

I trying to fix my vector not able to push_back problem but i get this error:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/memory:1456:36: No matching constructor for initialization of 'Point'

here is my code

Class

class Point
{
public:
    int x;
    int y;
    Uint8 r;
    Uint8 g;
    Uint8 b;
    Point(int x, int y, Uint8 r, Uint8 g, Uint8 b) : x(x), y(y), r(r), g(g), b(b) {}
    Point& operator=(Point const &np){
        x=np.x;
        y=np.y;
        r=np.r;
        g=np.g;
        b=np.b;
        return *this;
    }
    Point(const Point& point);
    ;
};

Line maybe cause error:

std::vector<Point> temp(10);

and this also not working:

std::vector<Point> temp;

Please help

here is more error message hope this help:

/Users/sum/Documents/3407ICT_Starter_Kit_v8/ProjectOSX/Source/Week3_T.cpp:8:10: In file included from /Users/sum/Documents/3407ICT_Starter_Kit_v8/ProjectOSX/Source/Week3_T.cpp:8:

/Users/sum/Documents/3407ICT_Starter_Kit_v8/ProjectOSX/Headers/Week3_T.h:3:10: In file included from /Users/sum/Documents/3407ICT_Starter_Kit_v8/ProjectOSX/Headers/Week3_T.h:3:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/vector:265:10: In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/vector:265:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/__bit_reference:15:10: In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/__bit_reference:15:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/algorithm:627:10: In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/algorithm:627:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/vector:925:25: In instantiation of function template specialization 'std::__1::allocator_traits

::construct' requested here

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/vector:1028:9: In instantiation of member function 'std::__1::vector >::__construct_at_end' requested here

/Users/sum/Documents/3407ICT_Starter_Kit_v8/ProjectOSX/Source/Week3_T.cpp:466:19: In instantiation of member function 'std::__1::vector >::vector' requested here

/Users/sum/Documents/3407ICT_Starter_Kit_v8/ProjectOSX/Headers/Week3_T.h:15:5: Candidate constructor not viable: requires 5 arguments, but 0 were provided

/Users/sum/Documents/3407ICT_Starter_Kit_v8/ProjectOSX/Headers/Week3_T.h:24:5: Candidate constructor not viable: requires single argument 'point', but no arguments were provided

Answer 1

In the standard library, certain containers "fill in" values using the default constructor when the value is not given explicitly. vector<Point> temp(10) initializes the vector with 10 elements, which are filled with the default-constructed value of your type. But when you have defined this constructor:

Point(int x, int y, Uint8 r, Uint8 g, Uint8 b) : x(x), y(y), r(r), g(g), b(b)
the compiler will not implicitly define a default constructor, so no constructor is available now. You can fix the compiler error by defining another constructor:

Point(){}