Compile the SGB examples.

[ascherer]

System: (K)Ubuntu 16.04 LTS
Compiler: g++ (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609

Try to g++ -c --std=c++14 the four BGL–SGB examples girth.cpp, miles_span.cpp, roget_components.cpp, and topo-sort-with-sgb.cpp. This leads to numerous errors.

Applied fixes

1. SGB 2002-01-30 changed the “Associated Press scores” from ap0 and ap1 to ap. This preprocessor macro (sic!) collides with numerous function parameters in named_function_params.hpp. #undefining the macro doesn't break the BGL–SGB examples.

2. girth.cpp fails because of a missing null_vertex() function. Added to the header templates.

3. roget_components.cpp invokes strncmp() from the C library. #include added.

4. topo-sort-with-sgb.cpp hickups because of a missing vertices() function. Following roget_components.cpp and putting the collective SGB header up front fixes this.

Results

With my local installation of the Stanford GraphBase, all four example programs compile and link fine with the commandline (from the example/ subdirectory)

for example in girth miles_span roget_components topo-sort-with-sgb
do
    g++ --std=c++14 -I../include -I/usr/include/sgb $example.cpp -o $example -lgb -L/usr/lib/sgb
done

The resulting executables produce the expected outputs.

[Belcourt]

Graph doesn't support C++14 at this time. We have numerous developers who still need C++98 so we're slowing moving forward to C++11. We're looking for migration paths to newer compilers without losing legacy codes and developers, finding the right balance is difficult.

[ascherer]

Well, the problems already occur without the --std=c++14 option and can be fixed for older compilers just the same way.