<分区>
代码会编译出错
class A
{
};
int main()
{
auto a = std::make_unique<A>();
std::function<void()> fun = [ap = std::move(a)](){
};
}
但在我使用 auto 而不是 std::function 之后就没问题了
class A
{
};
int main()
{
auto a = std::make_unique<A>();
auto fun = [ap = std::move(a)](){
};
}
错误是这样的:
C:/Qt/Qt5.11.1/Tools/mingw530_32/i686-w64-mingw32/include/c++/functional:1710:34: error: use of deleted function 'main()::<lambda()>::<lambda>(const main()::<lambda()>&)'
__dest._M_access<_Functor*>() =
^
C:\Users\Xiaopeng\CLionProjects\testGP\main.cpp:98:51: note: 'main()::<lambda()>::<lambda>(const main()::<lambda()>&)' is implicitly deleted because the default definition would be ill-formed:
std::function<void()> fun = [ap = std::move(a)](){
^
C:\Users\Xiaopeng\CLionProjects\testGP\main.cpp:98:51: error: use of deleted function 'std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = A; _Dp = std::default_delete<A>]'
In file included from C:/Qt/Qt5.11.1/Tools/mingw530_32/i686-w64-mingw32/include/c++/memory:81:0,
from C:\Users\Xiaopeng\CLionProjects\testGP\main.cpp:3:
C:/Qt/Qt5.11.1/Tools/mingw530_32/i686-w64-mingw32/include/c++/bits/unique_ptr.h:356:7: note: declared here
unique_ptr(const unique_ptr&) = delete;
^
当用户使用 std::function 时我的代码有什么问题？