I made some tests by following codes under my environment of Core i7 and
Windows Server 2008 R2(64bits):
cout<<sizeof(igraph_integer_t)<<endl; //4
cout<<sizeof(int)<<endl; //4
cout<<sizeof(long)<<endl; //4
cout<<sizeof(long int)<<endl; //4
cout<<sizeof(long long)<<endl; //8
I tried to modify the definition of igraph_integer_t and recompiled igraph, it
did not work for large number, neither.
I found that igraph_add_vertices invokes some other functions with parameter of
"long int". I think it is not safe to change all the "long int" into "long
long", so I give up.
However, I still have questions:
1. Why are the lengths of int, long, and long int all 4 bytes in my environment?
2. even for 4 bytes of igraph_integer_t, why does not igraph_add_vertices work
for 25 bits integer such as 33554431 and larger?
------------------ Original ------------------
From: "Tam??s Nepus"<[email protected]>;
Date: Thu, Apr 25, 2013 03:47 PM
To: "Help for igraph users"<[email protected]>;
Subject: Re: [igraph] What is the max value of a node id?
> Hi, it works fine here, so you'll need to tell us some more info.
A wild guess: could be a difference between 32-bit vs 64-bit platforms; more
precisely, the poster may be on a platform where an igraph_integer_t (i.e. a
long int) is 4 bytes only, while we are on a platform where it is 8 bytes.
--
T.
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