关于vbase的讨论汇总 - 话题女王

i**p
发帖数: 902

来自主题: Programming版 - 为啥 const Base cb 要求Base() {} 而 const vBase vb 不呢?

#include
using namespace std;
class Base {
public:
void f() const {}
};
class vBase {
public:
virtual void f() const {}
~vBase() {}
};
main() {
Base b;
//! const Base cb; // To enable it, add Base() {} to the class
const vBase vb;
const vBase vcb;
}

p***o
发帖数: 1252

来自主题: Programming版 - 为啥 const Base cb 要求Base() {} 而 const vBase vb 不呢?

Your compiler is buggy. Neither VC nor gcc requires a ctor in Base.

l*********s
发帖数: 5409

来自主题: Programming版 - 为啥 const Base cb 要求Base() {} 而 const vBase vb 不呢?

the standard requires custom ctor for const class, probably thee compiler
has a bug to let you go through with vCB
quote/
8.5]
9. If no initializer is specified for an object, and the object is of
(possibly cv-qualified) non-POD class type (or array thereof), the object
shall be default-initialized; if the object is of const-qualified type,
the underlying class type shall have a user-declared default constructor.
Otherwise, if no initializer is specified for an object, the object and
its subobje... 阅读全帖

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