Hi Phil:
What is the proper C++ way to initialize the private non-const member
m_prevSymbol of the PlDevice class to an invalue value (i.e., 0)?
valgrind is complaining about the uninitialized use of m_prevSymbol
for a test in PlDevice::DrawTextLine, and I am looking for a way to
shut it up. And we want that test to always fail the first time
(hence the need for an assignment to an invalid value) before m_prevSymbol
is assigned a valid value later in the routine.
I tried replacing
PLUNICODE m_prevSymbol;
by
PLUNICODE m_prevSymbol = 0;
in the private area of the PlDevice class defined
in drivers/wxwidgets.h, and that indeed made valgrind
shut up, i.e., the summary line is
ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
but now I have the following compiler warning message:
In file included from
/home/software/plplot/HEAD/plplot.git/drivers/wxwidgets.cpp:41:0:
/home/software/plplot/HEAD/plplot.git/drivers/wxwidgets.h:103:30: warning:
non-static data member initializers only available with -std=c++11 or
-std=gnu++11
PLUNICODE m_prevSymbol = 0;
I tried using the static attribute for m_prevSymbol, but the compiler errored
out in
that case because the const attribute was not used. However, const is
inappropriate because m_prevSymbol does get updated in the above
routine.
So the question boils down to a simple one which is what is the proper
C++ way to initialize a private non-const data member such as
m_prevSymbol without generating compiler warnings or errors?
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
Linux-powered Science
__________________________
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