本文共 4827 字，大约阅读时间需要 16 分钟。

前言

前段时间，在工程中用delete[]删除单个对象指针，引起崩溃。被同事找出来了。

实验

// @file main.cpp// @brief test delete obj and delete obj array, on debian#include 
   
    #include 
    
     #include 
     
      #ifndef WIN32#include 
      
       #endif // #ifndef WIN32#include "const_define.h"#include "class_to_test.h"void case_delete_one_obj_as_delete_ary();void case_delete_obj_ary();int main(int argc, char** argv){    printf(">> main()\n");    case_delete_one_obj_as_delete_ary();    case_delete_obj_ary();    return EXIT_SUCCESS;}/** run resultroot@debian750devmin:/home/dev# ./test_cpp_delete >> main()tip is one objclass_to_test::~class_to_test() : one objp_obj_ary[0]'s tip is class index = 0p_obj_ary[1]'s tip is class index = 1p_obj_ary[2]'s tip is class index = 2class_to_test::~class_to_test() : class index = 2class_to_test::~class_to_test() : class index = 1class_to_test::~class_to_test() : class index = 0*/void case_delete_one_obj_as_delete_ary(){    class_to_test* p_obj = NULL;    p_obj = new class_to_test();    if (NULL != p_obj) {        p_obj->save_tip("one obj");        printf("tip is %s\n", p_obj->get_tip());#ifndef WIN32        SAFE_DEL_OBJ(p_obj); // delete ONE object, only use delete! else crash#else        SAFE_DEL_OBJ(p_obj); // on windows, same too.#endif // #ifndef WIN32    }}void case_delete_obj_ary(){    int i = 0;    class_to_test* p_obj_ary = NULL;    int i_ary_cnt = 3;    char sz_buf[0x100] = {
  '\0'};    p_obj_ary = new class_to_test[i_ary_cnt];    if (NULL != p_obj_ary) {        for (i = 0; i < i_ary_cnt; i++) {            sprintf(sz_buf, "class index = %d", i);            (p_obj_ary + i)->save_tip(sz_buf);            printf("p_obj_ary[%d]'s tip is %s\n", i, (p_obj_ary + i)->get_tip());        }        SAFE_DEL_OBJ_ARY(p_obj_ary);    }}
      
     
    
   

// @file const_define.h// @brief ...#ifndef __CONST_DEFINE_H__#define __CONST_DEFINE_H__#ifndef SAFE_DEL_OBJ#define SAFE_DEL_OBJ(p) \{ \    if (NULL != (p)) { \        delete (p); \        (p) = NULL; \    } \}#endif // #ifndef SAFE_DEL_OBJ#ifndef SAFE_DEL_OBJ_ARY#define SAFE_DEL_OBJ_ARY(p) \{ \    if (NULL != (p)) { \        delete[] (p); \        (p) = NULL; \    } \}#endif // #ifndef SAFE_DEL_OBJ#endif // #define __CONST_DEFINE_H__

// @file class_to_test.h// @brief ...#ifndef __CLASS_TO_TEST_H__#define __CLASS_TO_TEST_H__class class_to_test {public:    class_to_test();    virtual ~class_to_test();    void save_tip(const char* psz_tip);    const char* get_tip();private:    void init();    void uninit();    void delete_tip();private:    char* m_psz_buf;    int m_i_len_buf;};#endif // #define __CLASS_TO_TEST_H__

// @file class_to_test.cpp#include 
   
    #include 
    
     #include 
     
      #ifndef WIN32#include 
      
       #endif // #ifndef WIN32#include "class_to_test.h"class_to_test::class_to_test(){    init();}class_to_test::~class_to_test(){    printf("class_to_test::~class_to_test() : %s\n", (NULL != this->get_tip()) ? this->get_tip() : "NULL");    uninit();}void class_to_test::save_tip(const char* psz_tip){    delete_tip();    if (NULL != psz_tip) {        m_i_len_buf = strlen(psz_tip);        m_psz_buf = new char[m_i_len_buf + 1];        m_psz_buf[m_i_len_buf] = '\0';        strcpy(m_psz_buf, psz_tip);    }}const char* class_to_test::get_tip(){    return m_psz_buf;   }void class_to_test::init(){    m_psz_buf = NULL;    m_i_len_buf = 0;}void class_to_test::uninit(){    delete_tip();}void class_to_test::delete_tip(){    if (NULL != m_psz_buf) {        delete [] m_psz_buf;        m_psz_buf = NULL;    }    m_i_len_buf = 0;}
      
     
    
   

# ==============================================================================# @file makefile# ==============================================================================BIN = test_cpp_deleteLINE80 = --------------------------------------------------------------------------------CC = g++ -std=c++98CFLAGS = -Wall -gINC = -I.LIBS = -lstdc++ -pthreadLIBPATH = ./ /usr/local/libDEPEND_CODE_DIR = ./empty_dir \DEPEND_CODE_SRC = $(shell find $(DEPEND_CODE_DIR) -name '*.cpp')DEPEND_CODE_OBJ = $(DEPEND_CODE_SRC:.cpp=.o)ROOT_CODE_SRC = $(shell find ./ -name '*.cpp')ROOT_CODE_OBJ = $(ROOT_CODE_SRC:.cpp=.o)SUB_CODE_DIR = ./empty_dirSUB_CODE_SRC = $(shell find $(SUB_CODE_DIR) -name '*.cpp')SUB_CODE_OBJ = $(SUB_CODE_SRC:.cpp=.o)clean:    clear    @echo $(LINE80)    @echo make clean    rm -f $(BIN) $(ROOT_CODE_OBJ) $(DEPEND_CODE_OBJ) $(SUB_CODE_OBJ)all:$(BIN)    @echo $(LINE80)    @echo make all    chmod 777 $(BIN)    find . -name $(BIN)$(BIN) : $(ROOT_CODE_OBJ) $(DEPEND_CODE_OBJ) $(SUB_CODE_OBJ)    $(CC) $(CFLAGS) -o $@ $^.cpp.o:    $(CC) -c $(CFLAGS) $^ -o $@ $(INC) -L$(LIBPATH) $(LIBS)rebuild:    make clean    @echo $(LINE80)    make all

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