模板基类初始化 [英] template Base Class initialization

问题描述

在Visual C ++中，以下代码被接受时，g ++将生成错误:派生的类没有任何字段名称Base"哪个符合标准?

while in visual c++ the code below is accepted, g++ will generate the error: "class Derived does not have any field name Base" which is following the standard?

template <class T>
class Base
{
public:
    Base(){};
};

template <class T>
class Derived:public Base<T>
{
public:
    Derived():Base(){}
};

顺便说一句:都接受

Derived():Base<T>(){}

所以同时，我将关注gcc

so meantime, I will follow gcc

推荐答案

MSVC ++不正确. Base 是模板，而不是类型.

MSVC++ is not correct. Base is a template, not a type.

请注意，在通常情况下， Base 是在 Derived< T> 的范围内查找的，这意味着它将首先找到从其继承的注入的类名. Base< T> ，指的是 Base< T> 类型.但是由于您有一个依赖的基类，所以找不到从 Base< T> 继承的名称(未研究基类范围).

Note that in the usual case, Base is looked up in the scope of Derived<T>, which means that it will first find the injected class name inherited from Base<T>, which refers to the type Base<T>. But as you have a dependent base class, the name inherited from Base<T> is not found (the base class scope is not looked into).

这篇关于模板基类初始化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！