Stroustrup 的 PPP 书中的多边形问题 [英] Trouble with Polygon in Stroustrup's PPP book
本文介绍了Stroustrup 的 PPP 书中的多边形问题的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我阅读了Stroustrup 的书《使用C++ 的编程原理和实践》.在第 12 章和第 441 页中有以下代码:
I read Programming Principles and Practice using C++, Stroustrup's book. In chapter 12 and in page 441 there is this code:
//
// This is example code from Chapter 12.3 "A first example" of
// "Programming -- Principles and Practice Using C++" by Bjarne Stroustrup
//
#include "Simple_window.h" // get access to our window library
#include "Graph.h" // get access to our graphics library facilities
//------------------------------------------------------------------------------
int main()
{
using namespace Graph_lib; // our graphics facilities are in Graph_lib
Point tl(100,100); // to become top left corner of window
Simple_window win(tl,600,400,"Canvas"); // make a simple window
Polygon poly; // make a shape (a polygon)
poly.add(Point(300,200)); // add a point
poly.add(Point(350,100)); // add another point
poly.add(Point(400,200)); // add a third point
poly.set_color(Color::red); // adjust properties of poly
win.attach (poly); // connect poly to the window
win.wait_for_button(); // give control to the display engine
}
//------------------------------------------------------------------------------
当我运行代码时,我收到 13 个错误,其中必定与 Polygon 标识符有关.例如第一个错误是:错误 C2872:多边形":不明确的符号
When I ran the code I get 13 errors which must of them are about the Polygon identifier. For example first error is: Error C2872: 'Polygon' : ambiguous symbol
为什么我的编译器不知道Polygon?
Why my compiler doesn't know that Polygon please?
推荐答案
如果符号不明确,则尝试使用其限定名称:
If the symbol is ambiguous then try to use its qualified name:
Graph_lib::Polygon poly;
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