fix osx 10.13 error

[pca006132]

Fix #576

@kahays can you verify if this works for you now?

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (062399c) 91.18% compared to head (eb70435) 91.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #577      +/-   ##
==========================================
- Coverage   91.18%   91.15%   -0.03%     
==========================================
  Files          35       35              
  Lines        4570     4570              
==========================================
- Hits         4167     4166       -1     
- Misses        403      404       +1     

Files	Coverage Δ
src/manifold/src/csg_tree.cpp	90.65% <50.00%> (-0.35%)	⬇️

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[kahays]

Thank you, this solves the issues with csg_tree.cpp!

Looks like a few more issues cropped up in bindings/python/manifold3d.cpp, all of the form error: call to unavailable member function 'value': introduced in macOS 10.14.

bindings/python/manifold3d.cpp:325:29: error: call to unavailable member function 'value': introduced in macOS 10.14
if (normalIdx.value().ndim() != 1 ||
bindings/python/manifold3d.cpp:326:29: error: call to unavailable member function 'value': introduced in macOS 10.14
normalIdx.value().shape(0) != 3)
bindings/python/manifold3d.cpp:328:38: error: call to unavailable member function 'value': introduced in macOS 10.14
auto value = normalIdx.value();
bindings/python/manifold3d.cpp:627:49: error: call to unavailable member function 'value': introduced in macOS 10.14
auto runTransform1 = runTransform.value();
bindings/python/manifold3d.cpp:640:55: error: call to unavailable member function 'value': introduced in macOS 10.14
auto halfedgeTangent1 = halfedgeTangent.value();

Not sure if it preserves semantics appropriately but I changed each variable.value().method() invocation with (*variable).method(), which allows it to compile.

[elalish]

Thanks!

[pca006132]

@kahays updated now, please check if it works. Also it is annoying that we cannot specify OSX 10.13 in github action because they don't plan to support such an old version.

[kahays]

Thank you, this fixes all the compilation issues! Tests pass just fine too. I really appreciate all your help getting this running on my ancient machine.