就是想 …
玩C,我发现如果创建一个名为circle的类,然后声明一个与该类名称完全相同的变量,则编译器不会抱怨.例如：
class circle {
// whatever it does in here
};
circle circle; // is a valid statement, but
circle *circle = new circle(); // gives you a 'circle' is not a type complain
事实证明,这适用于字符串string =“ string”;也一样并用Java尝试过,也可以.我想它也可以在C#上工作,但是我还没有尝试过.
谁能告诉我这背后的原因以及这是否是故意的功能？
解决方法:
n3337 9.1 / 2
A class declaration introduces the class name into the scope where it is declared and hides any class, variable,
function, or other declaration of that name in an enclosing scope (3.3). If a class name is declared in a scope
where a variable, function, or enumerator of the same name is also declared, then when both declarations
are in scope, the class can be referred to only using an elaborated-type-specifier (3.4.4).
n3337 9.1 / 4
[ Note: The declaration of a class name takes effect immediately after the identifier is seen in the class
definition or elaborated-type-specifier. For example,
class A * A;
first specifies A to be the name of a class and then redefines it as the name of a pointer to an object of
that class. This means that the elaborated form class A must be used to refer to the class. Such artistry
with names can be confusing and is best avoided. —end note ]
所以.
class circle {
// whatever it does in here
};
int main()
{
circle *circle; // gives you a 'circle' is not a type complain
}
编译良好.
class circle {
// whatever it does in here
};
int main()
{
circle *circle = new class circle(); // gives you a 'circle' is not a type complain
}
编译也很好.
标签：java,c-4 来源： https://codeday.me/bug/20191127/2075844.html
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