build issues on Ubuntu 18.04

[divsdotsrivs]

Hi, I am trying to get GRT working on ubuntu 18.04. When following the linux osx build instructions, I run into an issue when I go to compile the GRT library and examples. I get the following error:

[ 73%] Building CXX object CMakeFiles/GaussianMixtureModelsExample.dir/home/username/grt/examples/ClusteringModulesExamples/GaussianMixtureModelsExample/GaussianMixtureModelsExample.cpp.o
/home/username/grt/examples/ClusteringModulesExamples/GaussianMixtureModelsExample/GaussianMixtureModelsExample.cpp: In function ‘int main(int, const char**)’:
/home/username/grt/examples/ClusteringModulesExamples/GaussianMixtureModelsExample/GaussianMixtureModelsExample.cpp:62:25: error: cannot bind non-const lvalue reference of type ‘std::fstream& {aka std::basic_fstream&}’ to an rvalue of type ‘std::fstream {aka std::basic_fstream}’
if( !gmm.save( std::fstream("GMM.grt") ) ){
^~~~~~~~~~~~~~~~~~
In file included from /home/username/grt/build/../examples/../GRT/ClassificationModules/GMM/GMM.h:30:0,
from /home/username/grt/build/../examples/../GRT/GRT.h:129,
from /home/username/grt/examples/ClusteringModulesExamples/GaussianMixtureModelsExample/GaussianMixtureModelsExample.cpp:27:
/home/username/grt/build/../examples/../GRT/ClassificationModules/GMM/../../ClusteringModules/GaussianMixtureModels/GaussianMixtureModels.h:123:18: note: initializing argument 1 of ‘virtual bool GRT::GaussianMixtureModels::save(std::fstream&) const’
virtual bool save( std::fstream &file ) const;
^~~~
/home/username/grt/examples/ClusteringModulesExamples/GaussianMixtureModelsExample/GaussianMixtureModelsExample.cpp:68:25: error: cannot bind non-const lvalue reference of type ‘std::fstream& {aka std::basic_fstream&}’ to an rvalue of type ‘std::fstream {aka std::basic_fstream}’
if( !gmm.load( std::fstream("GMM.grt") ) ){
^~~~~~~~~~~~~~~~~~
In file included from /home/username/grt/build/../examples/../GRT/ClassificationModules/GMM/GMM.h:30:0,
from /home/username/grt/build/../examples/../GRT/GRT.h:129,
from /home/username/grt/examples/ClusteringModulesExamples/GaussianMixtureModelsExample/GaussianMixtureModelsExample.cpp:27:
/home/username/grt/build/../examples/../GRT/ClassificationModules/GMM/../../ClusteringModules/GaussianMixtureModels/GaussianMixtureModels.h:132:18: note: initializing argument 1 of ‘virtual bool GRT::GaussianMixtureModels::load(std::fstream&)’
virtual bool load( std::fstream &file ) ;
^~~~
[ 73%] Linking CXX executable GaussianMixtureModelsExample
c++: error: CMakeFiles/GaussianMixtureModelsExample.dir/home/username/grt/examples/ClusteringModulesExamples/GaussianMixtureModelsExample/GaussianMixtureModelsExample.cpp.o: No such file or directory
Copying GaussianMixtureModelsExample to examples directory
Error copying file "/home/username/grt/build/tmp/GaussianMixtureModelsExample" to "/home/username/grt/build/examples/GaussianMixtureModelsExample".

When I run make -i -k, I see that later on, the same problem occurs for the ClusterTreeExample. Any advice?

[jamiebullock]

This issue is fixed in pull request #165