typeid關鍵字

執行時獲知變數型別名稱，可以使用 typeid(變數).name()

但對於某些編譯器只會返回

#include<iostream>
#include<typeinfo>
#include<cxxabi.h>

using namespace std;

template<typename type>
inline string type_of(type &x)
{
    return abi::__cxa_demangle(typeid(x).name(),0,0,0);
}

 1 #include<iostream>
 2
 
 #include<typeinfo>
 3 #include<cxxabi.h>
 4 
 5 using namespace std;
 6 
 7 template<typename type>
 8 inline string type_of(type &x)
 9 {
10     return abi::__cxa_demangle(typeid(x).name(),0,0,0);
11 }
12 
13 unsigned long long a;
14 static short b;
15 __int128 c;
16 
17 inline void
 
 d(int e,float f)
18 {
19     return;
20 }
21 
22 struct node{
23     char g;
24     char h[100];
25     signed i;
26 }j[200];
27 
28 int k;
29 int *l=&k;
30 int **m=&l;
31 
32 signed main()
33 {
34     register int n;//暫存器變數只能在棧空間中使用 
35     cout<<"a:  "<<type_of(a)<<endl;
36     cout<<"
 
b:  "<<type_of(b)<<endl;
37     cout<<"c:  "<<type_of(c)<<endl;
38     cout<<"d:  "<<type_of(d)<<endl;
39     cout<<"j:  "<<type_of(j)<<endl;
40     cout<<"j[1].g:  "<<type_of(j[1].g)<<endl;
41     cout<<"j[100].h:  "<<type_of(j[100].h)<<endl;
42     cout<<"j[201].h[101]:  "<<type_of(j[201].h[101])<<endl;
43     cout<<"j[201].i:  "<<type_of(j[201].i)<<endl;
44     cout<<"k:  "<<type_of(k)<<endl;
45     cout<<"l:  "<<type_of(l)<<endl;
46     cout<<"m:  "<<type_of(m)<<endl;
47     cout<<"n:  "<<type_of(n)<<endl;
48     return 0;
49 }