请看下面的代码:
#include <iostream>
using namespace std;
class A {
public:
A() {};
virtual void foo(double d) { cout << d << endl; }
virtual void foo(double d, int a) = 0;
};
class B : public A {
public:
B() {};
virtual void foo(double d, int a) { cout << d << endl << a << endl; }
};
int main()
{
B b;
b.foo(3.14);
return 0;
}
编译器(试过g ++和visual c ++ 2008)说没有像B:foo(double)这样的函数.g ++的确切消息是:
main.cpp:21:错误:没有匹配函数来调用'B :: foo(double)'
它看起来像隐藏规则的效果,但在我看来这里不应该使用规则,因为我没有覆盖foo(double),并且两个foo方法都是在基类中定义的. …
我有以下HTML/CSS代码的问题:
CSS
* { padding: 0; margin: 0; border: none; outline: none; }
#container {
margin: 10px auto 10px auto;
width: 960px;
background-color: #dddddd;
border: solid 1px black;
}
#container2 {
margin-left: 200px;
margin-top: 400px;
background-color: yellow;
}
HTML
<body>
<div id="container">
<div id="container2">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> …