[c++/m] Add MultiTag compare function

Author: mpsonntag

nix_mx.cc

@@ -354,6 +354,7 @@ void mexFunction(int            nlhs,
         methods->add("MultiTag::openReferenceIdx", nixmultitag::openReferenceIdx);
         methods->add("MultiTag::openFeatureIdx", nixmultitag::openFeatureIdx);
         methods->add("MultiTag::openSourceIdx", nixmultitag::openSourceIdx);
+        methods->add("MultiTag::compare", nixmultitag::compare);
 
         classdef<nix::Section>("Section", methods)
             .desc(&nixsection::describe)

src/nixmultitag.cc

@@ -101,4 +101,10 @@ namespace nixmultitag {
         output.set(0, currObj.getSource(idx));
     }
 
+    void compare(const extractor &input, infusor &output) {
+        nix::MultiTag currObj = input.entity<nix::MultiTag>(1);
+        nix::MultiTag other = input.entity<nix::MultiTag>(2);
+        output.set(0, currObj.compare(other));
+    }
+
 } // namespace nixmultitag

src/nixmultitag.h

@@ -37,6 +37,8 @@ namespace nixmultitag {
 
     void openSourceIdx(const extractor &input, infusor &output);
 
+    void compare(const extractor &input, infusor &output);
+
 } // namespace nixmultitag
 
 #endif

tests/TestMultiTag.m

@@ -44,6 +44,7 @@
     funcs{end+1} = @test_retrieve_feature_data;
     funcs{end+1} = @test_set_units;
     funcs{end+1} = @test_attrs;
+    funcs{end+1} = @test_compare;
 end
 
 %% Test: Add sources by entity and id
@@ -761,3 +762,20 @@
     f = nix.File(fullfile(pwd, 'tests', fileName), nix.FileMode.ReadOnly);
     assert(isequal(f.blocks{1}.multiTags{1}.type, testType));
 end
+
+function [] = test_compare( varargin )
+%% Test: Compare MultiTag entities
+    f = nix.File(fullfile(pwd, 'tests', 'testRW.h5'), nix.FileMode.Overwrite);
+    b1 = f.create_block('testBlock1', 'nixBlock');
+    b2 = f.create_block('testBlock2', 'nixBlock');
+    d = b1.create_data_array('testDataArray', 'nixDataArray', nix.DataType.Double, [2 2]);
+    t1 = b1.create_multi_tag('testMultiTag1', 'nixMultiTag', d);
+    t2 = b1.create_multi_tag('testMultiTag2', 'nixMultiTag', d);
+    d = b2.create_data_array('testDataArray', 'nixDataArray', nix.DataType.Double, [2 2]);
+    t3 = b2.create_multi_tag('testMultiTag1', 'nixMultiTag', d);
+
+    assert(t1.compare(t2) < 0);
+    assert(t1.compare(t1) == 0);
+    assert(t2.compare(t1) > 0);
+    assert(t1.compare(t3) ~= 0);
+end