Irwin, Fons and Valery,
I think following code is not accepted by C++.
#include <iostream.h>
float a[38,10]; // This is equivalent to a[38] or a[10].
ifstream inp("btev2_trim",ios::in);
inp >> a; // this can't call operator(ifstream& ifs,float*& x);
C++ can not distinguish functions parameter that differ only by referencing
and pointer/array. In other words, you can not overload following functions.
ifstream& operator(ifstream& ifs,float*& x);
ifstream& operator(ifstream& ifs,float[] x);
ifstream& operator(ifstream& ifs,float* x);
ifstream& operator(ifstream& ifs,const float* x);
This means , C++ can not tell a difference between
float **ppf;
inp >> ppf;
and
float a[10];
inp >> a;
You can not even compile 'inp >> a'.
Suggestion,
I'm not sure the intention of a[39,10]. I assume you wanted 2-dim array. Then
'float a[38][10];' is the correct declaration.
2nd, C++ nor CINT can implicitly loop reading array. You need to explicitly
write loops, I think.
C++ is so complex. I might make mistake. Please inform me if I'm wrong.
Masaharu Goto
---------------------------------------------------------------
Hello Masa ,
I tried the example below under the "pure" CINT (under NT and under
Sun OS as well). Neither works.
Could you comment.
Valery
------- Forwarded Message Follows -------
Date: Wed, 16 Sep 1998 16:58:44 -0500
From: Irwin Gaines <gaines@fnal.gov>
Subject: Problem with CINT using istreams
To: rootdev@hpsalo.cern.ch
I am running ROOT(V2.00/11) on a windows 95 system, and am trying to
read in a simple ascii text file. I executed the following statements
in CINT:
#include <iostream.h>
float a[38,10];
ifstream inp("btev2_trim",ios::in);
inp >> a;
and i get the following error:
ROOT caused an invalid page fault in
module <unknown> at 0084:00e2e7f1.
Registers:
EAX=00e2e3a0 CS=0137 EIP=00e2e7f1 EFLGS=00010a03
EBX=01072424 SS=013f ESP=01535cec EBP=00000004
ECX=ffffffff DS=013f ESI=00e2e3a0 FS=3907
EDX=0153ac2c ES=013f EDI=00e2e780 GS=0000
Bytes at CS:EIP:
3a 5c 77 69 6e 64 6f 77 73 5c 54 45 4d 50 5c 34
Stack dump:
0049720c 00e2e3a0 0153ac44 010728e0 00450959 0153ac2c 00000000
0153ae20 00000000 0153ae20 0153ac2c 00e2e3a0 01072424 0044367d
0153ac2c 0153ae20
Do you have any idea what is wrong?? (by the way, if i try to just
read in a 1-d array by doing float a[38]; the program just hangs up
without any error message but never returns to the ROOT prompt).
thank you,
Irwin Gaines
This archive was generated by hypermail 2b29 : Tue Jan 04 2000 - 00:34:37 MET