[netcdfgroup] Memory leak in as_double()? (re-posting in plain text).

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• Subject: [netcdfgroup] Memory leak in as_double()? (re-posting in plain text).
• From: Sjur Kolberg <Sjur.A.Kolberg@xxxxxxxxx>
• Date: Thu, 5 Mar 2009 08:59:12 +0100

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Hello list,

(Sorry for double-posting, this is the same as former email but in plain te=
xt).
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NetCDF 4.0.1 Windows; pre-built netcdf.dll dated 29.09.08, C++ interface co=
mpiled into separate application. Microsoft Visual Studio 2005 SP 1.
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I am wondering if there is a memory leak in the function (or macro) NcVar::=
as_double(), as defined in netcdf.cpp line 548.
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I am terribly unfamiliar with macros and code blocks wrapped in #defines, a=
nd have a hard time understanding what happens.
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Inside an NcFile object, my code does:
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dt.m_dt =3D get_var(pTd->name())->as_double(pTd->size()-1);
// dt is a COleDateTime, dt.m_dt is a double
// pTd is a NcDim*
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to get the last value of the coordinate variable associated with pTd.=20
When executing the offending line, the applications memory usage increases =
24 KB. A get_space() function called from the macro seems to allocate space=
 according to the total size of the variable.The size of pTd is approx. 270=
0, and with 8 byte double, 24 kB makes sense.=20
I do see the "delete tmp;" in netcdf.cpp line 538, but my compiler refuse t=
o trace into this macro and I'm unable to determine why the memory is not f=
reed.
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Is this a memory leak, or am I being fooled by the Windows Task Manager's m=
emory usage state?
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Best regards,
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Sjur  K :-)
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