const issue on initial build

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Original issue reported on code.google.com by james.ga...@gmail.com on 22 Dec 2013 at 1:45

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Gah. I'm sorry. That got saved *way* too quickly, and I don't see an obvious 
way to edit it.

I'm trying to run through the basic tutorial on a linux box, using g++ 4.7.3. I 
started with the most recent trunk code pulled from here.

Did the basic `mkdir build; cd build; cmake ..; make all` thing.

It failed because of const'ness issues in tutorial18_particles.cpp.

I changed line 29 from
bool operator<(Particle& that){
to
bool operator<(const Particle& that) const {
and my build errors went away.

Original comment by james.ga...@gmail.com on 22 Dec 2013 at 1:53