[問題] struct指標轉為void指標後的使用
一個函式, 其中傳入的參數為一個void指標
而呼叫時傳入的有可能是struct A, struct B兩種不同的struct
請問一下在函式裡要怎麼去判斷是哪種struct而去做相應的動作呢?
謝謝!!
大概像這樣:
int foo( void *ptr ) {
//怎麼判斷 QQ?
//case A:
//case B:
}
int main()
{
struct type_a A;
struct type_b B;
foo( &A );
foo( &B );
return 0;
}
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