#include <iostream>
using namespace std;
#define INITIALIZER(f) \
static void f(void) __attribute__((constructor)); \
static void f(void)
#define DEINITIALIZER(f) \
static void f(void) __attribute__((destructor)); \
static void f(void)
static void IniFunc(){
int a = 1+1;
printf("func()---1+1= %d\n",a);
printf("func()---can not use std::cout \n");
//cout<<"func()"<<endl;
}
static void deFunc(){
cout<<"~func()"<<endl;
int a = 1+2;
printf("1+2= %d\n",a);
std::cout<<"std::cout"<<std::endl;
}
INITIALIZER(ff){
IniFunc();
};
DEINITIALIZER(dd){
deFunc();
std::cout<<"can use cout"<<std::endl;
};
/*
static void f1(void) __attribute__((constructor));
void f1(void){
printf("before main1111\n");
}
*/
/*
void static __attribute__((constructor)) before_main()
{
printf("before main\n");
}
void static __attribute__((destructor)) after_main()
{
printf("after main\n");
}
*/
int main(){
cout<< "in main"<<endl;
return 0;
}
ygy@ygy-VirtualBox:~/work/tmp$ g++ d.cpp
ygy@ygy-VirtualBox:~/work/tmp$ ./a.out
func()---1+1= 2
func()---can not use std::cout
in main
~func()
1+2= 3
std::cout
can use cout
