构造函数在C结构 [英] Constructor for structs in C

问题描述

假设：

 结构objStruct {
    INT ID;
    int值;
};typedef结构objStruct对象;
 

有一个快捷方式来分配和初始化对象，有点像C ++的构造函数？结果
它甚至可以是一个preprocessor宏。无论使得code比这更短，更具可读性：

 对象* newObj =的malloc（sizeof的（对象））;
//分配成功测试剪断
newObj-＆GT; ID = ID ++;
newObj-＆GT;值= myvalue的;
 

解决方案

在C I通常创建一个构造函数，做到这一点的风格的功能。例如（检查不再赘述错误）

 对象* Object_new（INT ID，int值）{
  对象* P =的malloc（sizeof的（对象））;
  P-＆GT; ID = ID;
  P-＆GT;值=价值;
  回磷;
}...
对象* P1 = Object_new（ID ++，myvalue的）;
 

Given:

struct objStruct {
    int id;
    int value;
};

typedef struct objStruct Object;

Is there a shortcut to allocate and initialize the object, something like a C++ constructor?
It could even be a preprocessor macro. Whatever makes the code shorter and more readable than this:

Object *newObj = malloc(sizeof(Object));
// successful allocation test snipped
newObj->id = id++;
newObj->value = myValue;

解决方案

In C I typically create a function in the style of a constructor which does this. For example (error checking omitted for brevity)

Object* Object_new(int id, int value) { 
  Object* p = malloc(sizeof(Object));
  p->id = id;
  p->value = value;
  return p;
}

...
Object* p1 = Object_new(id++, myValue);

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