C++复制 structBase{};typedefstruct:Base// inheriting from 'Base'; ill-formed{voidfn();// ill-formedstaticinti;// ill-formedstructU{voidf();// nested class has non-data member; ill-formed};intj =10;// default member initializer; ill-formed} S; 若要修复上面的代码,可以为未命名的类命名: C++复制 structBase{};typedefstru...
相关的链接在此: https://stackoverflow.com/questions/53408962/try-to-understand-compiler-error-message-default-member-initializer-required-be。 触发的代码是 gRPC v1.42.0 版本的 src/core/ext/xds/xds_api.h 文件(老版本没有这个问题,因为实现不一样)。相关代码是: 代码语言:javascript 代码运行次数:0 ...
N3471 constexpr For <initializer_list>, <tuple>, <utility> VS 2015 N3545 integral_constant::operator()() VS 2015 N3642 UDLs For <chrono>, <string> (1729ms, "meow"s, etc.) VS 2015 N3644 Null Forward Iterators VS 2015 N3654 quoted() VS 2015 N3657 Heterogeneo...
Compiler error C3446'class': a default member initializer is not allowed for a member of a value class Compiler error C3447operandto the conditional operator?:is of type 'void', but theother-operandis neither a throw-expression nor of type 'void' ...
classFoo{int m1;int m2;public:Foo(int x):m2{x},m1{++x}{}// BAD: misleading initializer order// ...};Foox(1);// surprise: x.m1 == x.m2 == 2 Enforcement(实施建议) (Simple) A member initializer list should mention the members in the same order they are declared. ...
in){return in;}宏的文档必须包括hideinitializer doxygen命令/** * \brief Get minimal value between `x` and `y` * \param[in] x: First value * \param[in] y: Second value * \return Minimal value between `x` and `y` * \hideinitializer */#define MIN(x, y) ((x) <...
struct B { }; typedef struct : B { // inheriting from 'B'; ill-formed void f(); // ill-formed static int i; // ill-formed struct U { void f(); // nested class has non-data member; ill-formed }; int j = 10; // default member initializer; ill-formed } S; The...
initializer_list类型 std::initializer_list<T>类型对象是一个访问const T类型对象数组的轻量代理对象。 与vector不同的是,initializer_list对象中的元素永远是常量值,我们无法改变initializer_list对象中元素的值。 我们通过调用运算符(call operator)来执行函数。调用运算符的形式是一对圆括号,它作用于一个表达式,该...
template <> class Blob<int> {typedef typename std::vector<int>::size_type size_type; Blob(); Blob(std::initializer_list<int> i1); int& operator[](size_type i);private:std::shared_ptr<std::vector<int>> data; void check(size_type i, const std::string &msg) const;...
这个时候,就必须自己显示的给 union 定义一个构造函数。 default-ctor 2A defaulted default constructor for class X is defined as deleted if: (2.1) X is a union that has a variant member with a non-trivial default constructor and no variant member of X has a default member initializer,...