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[英]Initialize a container inside a class/struct with std::initializer_list
[英]Struct with `initializer_list` ctor inside union?
我有一个POD结构,但是为了方便起见,我希望它具有std::initializer_list
ctor。 默认ctor,copy ctor和dtor是隐式的。 但是,似乎使用initializer_list
ctor会使该结构不符合POD的资格,因此它不能在联合体内:
#include<initializer_list>
struct A{
A(const std::initializer_list<int>&);
};
union{
A a;
} a;
gcc 4.6 --std = c ++ 0x:
error: use of deleted function ‘<anonymous union>::._0()’
error: ‘<anonymous union>::._0()’ is implicitly deleted because the default definition would be ill-formed:
error: no matching function for call to ‘A::A()’
周围有没有? 它与c ++ 11的无限制联合功能有关吗?
工会本身必须有一个明确的ctor-感谢本文 ):
union _u{
A a;
_u(){};
} a;
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