[c++/m] Add Section compare function

Closes #127

Author: mpsonntag

nix_mx.cc

@@ -394,6 +394,7 @@ void mexFunction(int            nlhs,
         methods->add("Section::referringBlockDataArrays", nixsection::referringBlockDataArrays);
         methods->add("Section::openSectionIdx", nixsection::openSectionIdx);
         methods->add("Section::openPropertyIdx", nixsection::openPropertyIdx);
+        methods->add("Section::compare", nixsection::compare);
 
         classdef<nix::Feature>("Feature", methods)
             .desc(&nixfeature::describe)

src/nixsection.cc

@@ -117,4 +117,10 @@ namespace nixsection {
         output.set(0, currObj.getProperty(idx));
     }
 
+    void compare(const extractor &input, infusor &output) {
+        nix::Section currObj = input.entity<nix::Section>(1);
+        nix::Section other = input.entity<nix::Section>(2);
+        output.set(0, currObj.compare(other));
+    }
+
 } // namespace nixsection

src/nixsection.h

@@ -32,6 +32,9 @@ namespace nixsection {
     void openSectionIdx(const extractor &input, infusor &output);
 
     void openPropertyIdx(const extractor &input, infusor &output);
+
+    void compare(const extractor &input, infusor &output);
+
 } // namespace nixsection
 
 #endif

tests/TestSection.m

@@ -38,6 +38,7 @@
     funcs{end+1} = @test_referring_sources;
     funcs{end+1} = @test_referring_block_sources;
     funcs{end+1} = @test_referring_blocks;
+    funcs{end+1} = @test_compare;
 end
 
 %% Test: Create Section
@@ -608,3 +609,14 @@
     b2.set_metadata('')
     assert(size(s.referring_blocks, 1) == 1);
 end
+
+function [] = test_compare( varargin )
+%% Test: Compare group entities
+    f = nix.File(fullfile(pwd, 'tests', 'testRW.h5'), nix.FileMode.Overwrite);
+    s1 = f.create_section('testSection1', 'nixSection');
+    s2 = f.create_section('testSection2', 'nixSection');
+
+    assert(s1.compare(s2) < 0);
+    assert(s1.compare(s1) == 0);
+    assert(s2.compare(s1) > 0);
+end