The implicitly-declared or defaulted default constructor for classTis undefined if: Thas a direct or virtual base which has a deleted default constructor, or it is ambiguous or inaccessible from this constructor. 在您的示例中,由于存在复制构造函数,因此删除了类Drink的隐式默认构造函数。 随后,未定义...
base(base&&);// Move constructor causes copy constructor to be// implicitly declared as deleted. To fix this// issue, you can explicitly declare a copy constructor:// base(base&);// If you want the compiler default version, do this:// base(base&) = default;};voidcopy(base *p){ bas...
// 编译报错:Call to implicitly-deleted copy constructor of 'std::unique_ptr<int>' // 即unique_ptr不提供拷贝构造函数unique_ptr(const unique_ptr &) = delete; // 以及赋值运算符unique_ptr& operator=(const unique_ptr &) = delete; std::unique_ptr<int> sp_i2 = sp_i1; std::cout <...
Compiler warning (level 1 and level 4, off) C4625 'derived class': copy constructor was implicitly defined as deleted Compiler warning (level 1 and level 4, off) C4626 'derived class': assignment operator was implicitly defined as deleted Compiler warning (level 1, no longer emitted) C4627...
Compiler warning C5022 'type': multiple move constructors specified Compiler warning C5023 'type': multiple move assignment operators specified Compiler warning (level 4, off) C5024 'type': move constructor was implicitly defined as deleted Compiler warning (level 4, off) C5025 'type': move as...
main.cc:8:10: error: call to implicitly-deleted copyconstructorof 'std::__1::unique_ptr<int, std::__1::default_delete<int> >' auto int_p1 = int_p0; ^ ~~~/opt/llvm/clang-10.0.1/bin/../include/c++/v1/memory:2513:3: note: copyconstructoris implicitly deleted because 'unique_...
copy constructorof 'D' is implicitly deleted because base class 'B' has a deleted copy ...
(or/std:c++20in Visual Studio 2019 version 16.11 and later), a class with any user-declared constructor (for example, including a constructor declared= defaultor= delete) isn't an aggregate. Previously, only user-provided constructors would disqualify a class from being an aggregate. This ...
问嵌套联合编译错误:试图引用已删除函数的C2280EN联合的一个非静态数据成员最多可以有一个大括号或相等...
will cause an implicitly generated copy constructor or implicitly generated copy assignment operator to be defined as deleted. So as soon as any of the special functions is declared, the others should all be declared to avoid unwanted effects like turning all potential moves into more expensive cop...