[c++/m] Add Group compare function

Author: mpsonntag

nix_mx.cc

@@ -207,6 +207,7 @@ void mexFunction(int            nlhs,
         methods->add("Group::openTagIdx", nixgroup::openTagIdx);
         methods->add("Group::openMultiTagIdx", nixgroup::openMultiTagIdx);
         methods->add("Group::openSourceIdx", nixgroup::openSourceIdx);
+        methods->add("Group::compare", nixgroup::compare);
 
         classdef<nix::DataArray>("DataArray", methods)
             .desc(&nixdataarray::describe)

src/nixgroup.cc

@@ -97,4 +97,10 @@ namespace nixgroup {
         output.set(0, currObj.getSource(idx));
     }
 
+    void compare(const extractor &input, infusor &output) {
+        nix::Group currObj = input.entity<nix::Group>(1);
+        nix::Group other = input.entity<nix::Group>(2);
+        output.set(0, currObj.compare(other));
+    }
+
 } // namespace nixgroup

src/nixgroup.h

@@ -39,6 +39,8 @@ namespace nixgroup {
 
     void openSourceIdx(const extractor &input, infusor &output);
 
+    void compare(const extractor &input, infusor &output);
+
 } // namespace nixgroup
 
 #endif

tests/TestGroup.m

@@ -41,6 +41,7 @@
     funcs{end+1} = @test_open_tag_idx;
     funcs{end+1} = @test_open_multi_tag_idx;
     funcs{end+1} = @test_open_source_idx;
+    funcs{end+1} = @test_compare;
 end
 
 %% Test: Access nix.Group attributes
@@ -853,3 +854,18 @@
     assert(strcmp(f.blocks{1}.groups{1}.open_source_idx(1).name, s2.name));
     assert(strcmp(f.blocks{1}.groups{1}.open_source_idx(2).name, s3.name));
 end
+
+function [] = test_compare( varargin )
+%% Test: Compare group entities
+    f = nix.File(fullfile(pwd, 'tests', 'testRW.h5'), nix.FileMode.Overwrite);
+    b1 = f.create_block('testBlock1', 'nixBlock');
+    b2 = f.create_block('testBlock2', 'nixBlock');
+    g1 = b1.create_group('testGroup1', 'nixGroup');
+    g2 = b1.create_group('testGroup2', 'nixGroup');
+    g3 = b2.create_group('testGroup1', 'nixGroup');
+
+    assert(g1.compare(g2) < 0);
+    assert(g1.compare(g1) == 0);
+    assert(g2.compare(g1) > 0);
+    assert(g1.compare(g3) ~= 0);
+end