问题描述
限时送ChatGPT账号..class Example {
// ...
};
template <typename T, Example ex> //Error
class MyExample{
// ...
};
我的问题是为什么模板非类型参数不能是类类型?
My question is why can't template non-type parameters be of class type?
我得到的错误是
error: ‘class Example’ 不是模板常量参数的有效类型
推荐答案
很简单,因为这些就是规则.合理地,模板参数必须在编译时解析,类类型的对象仅在运行时构造(即使是临时对象和具有静态存储持续时间的对象).您只能拥有在编译时可解析的值"模板参数,例如整数和类型.但是,模板参数可以是指向对象的指针或引用.
Simply, because those are the rules. Rationally, template parameters have to be resolved at compile time and objects of class type are only constructed (even temporaries and those with static storage duration) at run time. You can only have template parameters that are "values" resolvable at compile time such as integers and types. It is possible to have template parameters that are pointers or references to objects, though.
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