RAD Studio C++ Builder 中的三角剖分单调多边形

Question

C++ Builder RAD Studio 中的代码错误：[bcc32c 错误] Unit10.cpp(267)：没有匹配的构造函数用于初始化“triangulated_poly”。 怎么了？请帮助，以便一切正常。 //

//---------------------------------------------------------------------------

#include <vcl.h>
#include <vector>
#include <stack>
#pragma hdrstop

#include "Unit10.h"

using namespace std;
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm10 *Form10;

int ii=0;
//---------------------------------------------------------------------------
__fastcall TForm10::TForm10(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------
class triangulated_poly :public polygone {
    Stack stack;
    int stack_length;
    point left_vertex;
    point right_vertex;
    diagonal* diagonals;
    flag_vertex* x_vertexes;
public:
    triangulated_poly(point* U_points, point* L_points, int UPPER_count, int LOWER_count);
    ~triangulated_poly();

    void x_sort();
    void triangulate();

};


triangulated_poly::triangulated_poly(point* U_points, point* L_points, int UPPER_count, int LOWER_count) :polygone(U_points, L_points, UPPER_count, LOWER_count) {
    ..........
}

triangulated_poly::~triangulated_poly() {
        .......
}



void triangulated_poly::triangulate() {
........
}
//---------------------------------------------------------------------------
void __fastcall TForm10::Button1Click(TObject *Sender)
{
HDC hdc=GetDC(Form10->Handle);
for (int i = 0; i < ii; i++)
{
MoveToEx(hdc,s[i].x,s[i].y,NULL);
LineTo(hdc,s[(i+1)%ii].x,s[(i+1)%ii].y);
}
triangulated_poly poly;
poly.triangulate();
}

Answer 1

线

triangulated_poly poly;

尝试使用其默认构造函数构造triangulated_poly。

您从未为triangulated_poly 声明默认构造函数（即除了空参数列表的构造函数），并且没有隐式声明的构造函数，因为您自己声明了至少一个构造函数。所以编译器给你的错误是没有找到合适的构造函数。

要么向triangulated_poly 添加一个默认构造函数，要么构造triangulated_poly，其参数列表与triangulated_poly 的构造函数参数匹配：

triangulated_poly poly{/*arguments here*/};