Flexible array member is a feature introduced in the C99 standard of the C programming language (in particular, in section §6.7.2.1, item 16, page 103). It is a member of a struct, which is an array without a g
也许大家可能没有听说过柔性数组（flexible array）这个概念，但是它确实是存在的。C99 标准中，结构体中的最后一个元素允许是未知大小的数组，这个成员就叫做『柔性数组』成员 什么意思呢？那接下来我们就来举个例子：我们看 struct S 这个结构体类型，它就包含了一个柔性数组成员 int arr[]，它的大小是未知的，...
1#include<stdio.h>2#include<malloc.h>34typedefstruct_FlexibleArray{5intlen;6intarray[0]; // 有些编译器得使用array[],因为后者是在C99中标准写法,而array[0]是作为编译器的拓展写法7}FlexibleArray;89intmain()10{11intlen=10,i=0;1213FlexibleArray*p=(FlexibleArray*)malloc(sizeof(FlexibleArray) ...
C:弹性数组——flexible array 大川搬砖 专注嵌入式开发,rtos,linux c,cmake,工具。 来自专栏 · C + 嵌入式 4 人赞同了该文章 一. 定义 定义数组时,没有指明其长度,此为弹性数组。 二. 使用条件 弹性数组只能存在于结构体中,并且必须满足如下条件: 弹性数组必须为结构体的最后一个成员; 该结构体必须包含...
也许你从来就没有听过柔性数组(flexible array)这个概念,但他是真的存在; 柔性数组的概念存在于C99标准当中,C99标准表示:结构体的最后一个成员可以是一个大小不确定的数组,这个数组就叫做柔性数组; 既然搭配了柔性这一修饰词,那么这个数组就不会是”耿直“的了。
Also known as the “struct hack”. Allows the last member of a struct to be an array of zero length, such asintfoo[];Such a struct is commonly used as the header to access malloced memory. For example, in this structure,struct s { int n; double d[]; } S;, the array,d, is ...
9.2 The initializer for an aggregate or union shall be enclosed in braces. Readability Noncompliant 9.3 Arrays shall not be partially initialized. Readability Noncompliant 9.4 An element of an object shall not be initialized more than once. Required Compliant 9.5 Where designated initializers are used...
9.2 The initializer for an aggregate or union shall be enclosed in braces. Readability Compliant 9.3 Arrays shall not be partially initialized. Readability Compliant 9.4 An element of an object shall not be initialized more than once. Required Compliant 9.5 Where designated initializers are used...
-fdeduce-init-list Enable deduction of a template type parameter as "std::initializer_list" from a brace- enclosed initializer list, i.e. template <class T> auto forward(T t) -> decltype (realfn (t)) { return realfn (t); } void f() { forward({1,2}); // call forward<std:...
Object Initializer Syntax is fine for ‘plain old data’ types. Avoid using this syntax for classes or structs with constructors. If splitting across multiple lines, indent one block level. In general, namespaces should be no more than 2 levels deep. ...