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Possible Duplicate:
Why do C++11-deleted functions participate in overload resolution?
我对以下 C++11 代码有两个问题:
#include <iostream>
using namespace std;
struct A {
A() { cout << "Default c-tor" << endl; }
A(const A&) { cout << "Copy c-tor" << endl; }
A(A&&) = delete;
};
A f()
{
A a;
return a;
}
int main()
{
A b = f();
return 0;
}
我用 gcc 和 clang 得到以下编译错误
gcc-4.7.2 (g++ --std=c++11 main.cpp):
main.cpp: In function ‘A f()’:
main.cpp:16:9: error: use of deleted function ‘A::A(A&&)’
main.cpp:8:2: error: declared here
main.cpp: In function ‘int main()’:
main.cpp:21:10: error: use of deleted function ‘A::A(A&&)’
main.cpp:8:2: error: declared here
clang-3.0 (clang++ --std=c++11 main.cpp):
main.cpp:19:4: error: call to deleted constructor of 'A'
A b = f();
^ ~~~
main.cpp:8:2: note: function has been explicitly marked deleted here
A(A&&) = delete;
^
1 error generated.
- 如果显式删除了 move 构造函数，编译器是否应该使用复制构造函数？
- 有谁知道“不可 move ”类型的用途吗？
提前致谢。