Webb1 mars 2004 · We can be a bit more specific about the term "structure name." In a nutshell, if the structure name you use, call it s, results in a valid C expression when written as (s … Webb22 apr. 2024 · So called "pointers" to members in C++ are more like offsets, internally. You need both such a member "pointer", and an object, to reference the member in …

What are the pointer-to-member operators ->* and .* in C++?

Webb11 apr. 2011 · If the type U is a POD, you can use the macro offsetof, but formally, it's undefined behavior if the type isn't a POD: depending on the compiler, you'll get a … Webboffsetof(type, member-designator) Parameters type − This is the class type in which member-designator is a valid member designator. member-designator − This is the … hostelworld hawaii

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

Webb20 mars 2024 · The thing about member function pointers is that they are known at compile time. The type is known at compile time, obviously, but so are the specific … Webb4 jan. 2024 · POD types. When a class or struct is both trivial and standard-layout, it is a POD (Plain Old Data) type. The memory layout of POD types is therefore contiguous … Webb25 sep. 2016 · #define FIELD_OFFSET(type, field) ((LONG)(LONG_PTR)&(((type *)0)->field)) 内部实现其实就是将 0 这个地址强制转换为结构体类型，然后使用强转后的结构 … psychology of criminal profiling course