Fixing Compile Issue on macOS 10.13 High Sierra and GCC 7.2.0

[gabecfernandez]

When compiling using gcc 7.2.0 on macOS 10.13 High Sierra, I encountered the following error:

graphlet_utils.cpp: In function 'bool fexists(const char*)':
graphlet_utils.cpp:42:12: error: cannot convert 'std::ifstream {aka std::basic_ifstream<char>}' to 'bool' in return
     return ifile;
            ^~~~~
make: *** [pgd] Error 1

I changed 'return ifile;' to be 'return (bool)ifile;' and was able to compile successfully.

Reference: https://stackoverflow.com/questions/38659115/make-fails-with-error-cannot-convert-stdistream-aka-stdbasic-istreamchar

[rbassett3]

I second this issue. I have Ubuntu 18.04 and GCC 7.3 and can confirm that the above fix works for me.

[aanastasiou]

It is a reasonable error (and subsequent fix) given the definition and use of fexists(). I came across it too on Linux.

[SaraTohidi]

I had the same issue. I fixed it with the same approach "(bool)ifile". I have Ubuntu 18.04 and GCC 7.5.