在linux kernel中最经典的指针技巧就是container_of()了 #define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)/*** container_of - cast a member of a structure out to the containing structure* @ptr: the pointer to the member.* @type: the type of the container struct this is...
C Pointer-to-Function 与 C++ Pointer-to-MemberFunction 的区别 在看APUE Figure1.10的时候发现signal(SIGINT, sig_int)这里的sig_int直接用的函数名,但是看Thinking-in-C++ Vol.2的时候发现mem_fun(&Shape::draw)却对函数名进行了取地址操作,感觉有疑问就查了一下资料,下面的代码可以展示出这两者之间的一些...
A pointer to a function to a pointer to a function of a different type (从指向函数的指针转向另一个不同类型的指向函数的指针) A pointer to an object to a pointer to an object of a different type (从一个指向对象的指针转向另一个不同类型的指向对象的指针) A pointer to a member to a po...
10. int const *pa;指向整型常量的pointer,可以修改pointer value,但不可以修改它所指向的value。int *const pb;指向整型的常量pointer,无法修改pointer value,但可以修改它所指向整型value。int const *const pc;pointer vale和指向的整型的value都不可被修改。const修饰的对象不变,上例前两个为:*pa和pb,也就是...
"Member = %d\n", *s1_ptr); // Member = 10 } QUESTION: Is it guaranteed that in all cases a pointer to a struct is a exactly the same pointer to its first element?In this particular case it works as I expected, but I'm not sure if it is guaranteed. Is compiler free to ...
3)Conversion: integral conversion, floating-point conversion, floating-integral conversion, pointer conversion, pointer-to-member conversion, boolean conversion, user-defined conversion of a derived class to its base 精确匹配、提升、转换 三种隐式类型转换(包括里面的各小项)优先级依次降低。
According to the C Standard, it is allowed to cast a pointer to a struct to a pointer of the type of the first member of this struct. However, is it allowed to do the opposite? Consider the following example: //texture.htypedefstructHAL_TEXTURE{size_tw;size_th; ...
member.// if CreateMyDACL(&sa) fails, exit(1)// Obtain a file handle.hFile = CreateFile( pszFileName,// the file nameGENERIC_READ|GENERIC_WRITE,// access mode:// read from and write to// this file0,// share mode&sa,// securityOPEN_ALWAYS,// how to createFILE_ATTRIBUTE_...
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