"class invariant" meaning in English

{
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    {
      "form": "class invariants",
      "tags": [
        "plural"
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      "expansion": "class invariant (plural class invariants)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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          "langcode": "en",
          "name": "Object-oriented programming",
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      "examples": [
        {
          "ref": "2000, Meilir Page-Jones, Fundamentals of Object-oriented Design in UML, Addison-Wesley Professional, →ISBN, page 272:",
          "text": "Every object of a given class must satisfy the class's invariant. This invariant acts as a constraint, limiting the size of the class's state-space. A subclass both inherits the class invariant(s) of its superclass(es) and adds a further restriction of its own.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An invariant used to constrain objects of a class that is preserved by class methods and that constrains the state stored in the object."
      ],
      "id": "en-class_invariant-en-noun-uDUIPFOO",
      "links": [
        [
          "object-oriented programming",
          "object-oriented programming"
        ],
        [
          "invariant",
          "invariant"
        ],
        [
          "class",
          "class"
        ]
      ],
      "qualifier": "object-oriented programming",
      "raw_glosses": [
        "(object-oriented programming) An invariant used to constrain objects of a class that is preserved by class methods and that constrains the state stored in the object."
      ],
      "related": [
        {
          "word": "design by contract"
        }
      ],
      "synonyms": [
        {
          "word": "type invariant"
        }
      ],
      "wikipedia": [
        "class invariant"
      ]
    }
  ],
  "word": "class invariant"
}

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    {
      "form": "class invariants",
      "tags": [
        "plural"
      ]
    }
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      "expansion": "class invariant (plural class invariants)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "design by contract"
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        "en:Object-oriented programming"
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      "examples": [
        {
          "ref": "2000, Meilir Page-Jones, Fundamentals of Object-oriented Design in UML, Addison-Wesley Professional, →ISBN, page 272:",
          "text": "Every object of a given class must satisfy the class's invariant. This invariant acts as a constraint, limiting the size of the class's state-space. A subclass both inherits the class invariant(s) of its superclass(es) and adds a further restriction of its own.",
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        }
      ],
      "glosses": [
        "An invariant used to constrain objects of a class that is preserved by class methods and that constrains the state stored in the object."
      ],
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          "object-oriented programming",
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      "qualifier": "object-oriented programming",
      "raw_glosses": [
        "(object-oriented programming) An invariant used to constrain objects of a class that is preserved by class methods and that constrains the state stored in the object."
      ],
      "synonyms": [
        {
          "word": "type invariant"
        }
      ],
      "wikipedia": [
        "class invariant"
      ]
    }
  ],
  "word": "class invariant"
}