C++函数中，两个自动释放内存的动态内存申请类
最近做一个事情，实现一个流程交互，其中主交互流程函数中，涉及较多的内存申请，
而健康的函数，都是在函数退出前将手动申请不再需要的内存释放掉，
使用很多方法，都避免不了较多的出错分支时，一堆的if free/delete，代码长而且不好管理
因此，利用C++对象离开作用域会自动调用析构函数的特点，在这儿实现了两个自动释放内存的动态内存申请类
第一个类，只管理内存，不并管理对象
#include <vector> classXAutoFreeMem
{protected:
std::vector<void*>vec_memorys_;public:
XAutoFreeMem::XAutoFreeMem() {};virtual XAutoFreeMem::~XAutoFreeMem()
{//释放对象时，释放管理的内存 for(auto item : vec_memorys_){free(item);
}
}//通过此接口来申请内存 void* malloc_mem(unsigned intnsize)
{void* ptr = malloc(nsize);if (nullptr !=ptr) {
vec_memorys_.push_back(ptr);
}returnptr;
}
};
第二个类，能够同时支持内存管理、对象管理
typedef void (*delete_obj_func)(void*);class XAutoFreeObject : publicXAutoFreeMem
{private:
typedefstructobject_manager_st
{void*obj_this;
delete_obj_func delete_ptr;
}object_manager_st;protected:
template<typename T> static void free_object(T*p_this)
{deletep_this;
}
template<typename T> static void free_objects(T*p_this)
{delete[]p_this;
}protected:
std::vector<object_manager_st>vec_objects_;public:
XAutoFreeObject::XAutoFreeObject() {};virtual XAutoFreeObject::~XAutoFreeObject()
{//释放对象时，释放管理的对象 for(auto item : vec_objects_){
(*item.delete_ptr)(item.obj_this);
}
}//对象//通过此接口来创建对象 template<typename T> void new_object(T**ppObj)
{
object_manager_st stObjMan;
stObjMan.obj_this= newT;if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr =(delete_obj_func) & free_object<T>;//保存之 vec_objects_.push_back(stObjMan);
}*ppObj = (T*)(stObjMan.obj_this);return;
}//通过此接口来创建对象 template<typename T, typename P> void new_object_with_param(T**ppObj, P param)
{
object_manager_st stObjMan;
stObjMan.obj_this= newT(param);if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr = & free_object<T>;//保存之 vec_objects_.push_back(stObjMan);
}*ppObj = (T*)(stObjMan.obj_this);return;
}//通过此接口来创建对象，这几个接口使用会麻烦一些，使用示例：std::string* pstr = stAutoManager.new_object<std::string> (); template<typename T>T*new_object()
{
object_manager_st stObjMan;
stObjMan.obj_this= newT;if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr =(delete_obj_func) & free_object<T>;//保存之 vec_objects_.push_back(stObjMan);
}return (T*)(stObjMan.obj_this);
}//通过此接口来创建对象 template<typename T, typename P>T*new_object_with_param(P param)
{
object_manager_st stObjMan;
stObjMan.obj_this= newT(param);if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr = & free_object<T>;//保存之 vec_objects_.push_back(stObjMan);
}return (T*)(stObjMan.obj_this);
}//对象数组//通过此接口来创建对象数组 template<typename T> void new_objects(T** ppObj, intnum)
{
object_manager_st stObjMan;
stObjMan.obj_this= newT[num];if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr =(delete_obj_func) & free_objects<T>;//保存之 vec_objects_.push_back(stObjMan);
}*ppObj = (T*)(stObjMan.obj_this);return;
}//通过此接口来创建对象数组 template<typename T, typename P> void new_objects_with_param(T** ppObj, intnum, P param)
{
object_manager_st stObjMan;
stObjMan.obj_this= newT[num](param);if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr = & free_object<T>;//保存之 vec_objects_.push_back(stObjMan);
}*ppObj = (T*)(stObjMan.obj_this);return;
}//通过此接口来创建对象数组 template<typename T>T* new_objects(intnum)
{
object_manager_st stObjMan;
stObjMan.obj_this= newT[num];if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr =(delete_obj_func) & free_object<T>;//保存之 vec_objects_.push_back(stObjMan);
}return (T*)(stObjMan.obj_this);
}//通过此接口来创建对象数组 template<typename T, typename P>T* new_objects_with_param(intnum, P param)
{
object_manager_st stObjMan;
stObjMan.obj_this= newT[num](param);if (nullptr !=stObjMan.obj_this) {//取得函数指针 stObjMan.delete_ptr = & free_object<T>;//保存之 vec_objects_.push_back(stObjMan);
}return (T*)(stObjMan.obj_this);
}
};
调用示例如下：
int main(int argc, char*argv[])
{//cwSL3D_test_sum();//测试能否成功调用所有接口 XAutoFreeObject stAutoManager;char* strMem = (char*)stAutoManager.malloc_mem(100);
std::string* pstr = stAutoManager.new_object<std::string>();
std::string* pstr2 =nullptr;
stAutoManager.new_object(&pstr2);
{
std::vector<int>* pvec =nullptr;
stAutoManager.new_object(&pvec);
std::vector<int>* pvec2 =nullptr;
stAutoManager.new_objects(&pvec, 2);
}return 0;
}