object-introspection/test/integration/unions.toml

# TODO: The tagged union tests should be updated when tagged union support is in:
# https://github.com/facebookexperimental/object-introspection/issues/234
includes = ["string", "unordered_map", "vector"]
definitions = '''
  union MyUnion {
    int n;
    std::vector<int> vec;
    std::unordered_map<std::string, std::string> map;

    MyUnion(int n_) : n(n_) {}
    MyUnion(const std::vector<int>& vec_) : vec(vec_) {}
    MyUnion(const std::unordered_map<std::string, std::string>& map_) : map(map_) {}
    MyUnion(const MyUnion& /*other*/) { /* we don't know which field to copy */ }
    ~MyUnion() {}
  };

  struct TaggedUnion {
    MyUnion storage;
    uint8_t tag;

    TaggedUnion(const MyUnion& storage_, uint8_t tag_) : storage(0), tag(tag_) {
      copyStorage(storage_);
    }

    TaggedUnion(const TaggedUnion& other) : storage(0), tag(other.tag) {
      copyStorage(other.storage);
    }

    void copyStorage(const MyUnion& other) {
      if (tag == 0) {
        storage.n = other.n;
      } else if (tag == 1) {
        new (&storage.vec) decltype(MyUnion::vec){other.vec};
      } else if (tag == 2) {
        new (&storage.map) decltype(MyUnion::map){other.map};
      } else {
        assert(false);
      }
    }
  };
'''

[cases]
  [cases.int]
    param_types = ["const MyUnion&"]
    setup = "return 123;"
    expect_json = '[{"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "NOT":"members"}]'
    expect_json_v2 = '[{"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "size":56, "members":[]}]'
  [cases.vector]
    param_types = ["const MyUnion&"]
    setup = "return std::vector{1,2,3};"
    expect_json = '[{"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "NOT":"members"}]'
    expect_json_v2 = '[{"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "size":56, "members":[]}]'
  [cases.unordered_map]
    param_types = ["const MyUnion&"]
    setup = 'return std::unordered_map<std::string, std::string>{{"a", "b"}, {"c","d"}};'
    expect_json = '[{"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "NOT":"members"}]'
    expect_json_v2 = '[{"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "size":56, "members":[]}]'

  [cases.alignment]
    # Wrap the union in a pair as a way of inferring its alignment
    param_types = ["const std::pair<char, MyUnion>&"]
    setup = 'return {{0, MyUnion{123}}};'
    expect_json = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "members":[
        {"staticSize":1, "dynamicSize":0, "exclusiveSize":1},
        {"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "NOT":"members"}
      ]}]'''
    expect_json_v2 = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "size":64, "members":[
        {"staticSize":1, "dynamicSize":0, "exclusiveSize":1, "size":1},
        {"staticSize":56, "dynamicSize":0, "exclusiveSize":56, "size":56, "members":[]}
      ]}]'''

  [cases.tagged_int]
    param_types = ["const TaggedUnion&"]
    setup = "return TaggedUnion{MyUnion{123}, 0};"
    expect_json = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "members":[
        {"name":"storage", "staticSize":56, "dynamicSize":0, "exclusiveSize":56, "NOT":"members"},
        {"name":"tag", "staticSize":1, "dynamicSize":0, "exclusiveSize":1, "NOT":"members"}
      ]}]'''
    expect_json_v2 = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "size":64, "members":[
        {"name":"storage", "staticSize":56, "dynamicSize":0, "exclusiveSize":56, "size":56, "members":[]},
        {"name":"tag", "staticSize":1, "dynamicSize":0, "exclusiveSize":1, "size":1, "members":[]}
      ]}]'''
  [cases.tagged_vector]
    param_types = ["const TaggedUnion&"]
    setup = "return TaggedUnion{MyUnion{std::vector{1,2,3}}, 1};"
    expect_json = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "members":[
        {"name":"storage", "staticSize":56, "dynamicSize":0, "exclusiveSize":56, "NOT":"members"},
        {"name":"tag", "staticSize":1, "dynamicSize":0, "exclusiveSize":1, "NOT":"members"}
      ]}]'''
    expect_json_v2 = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "size":64, "members":[
        {"name":"storage", "staticSize":56, "dynamicSize":0, "exclusiveSize":56, "size":56, "members":[]},
        {"name":"tag", "staticSize":1, "dynamicSize":0, "exclusiveSize":1, "size":1, "members":[]}
      ]}]'''
  [cases.tagged_unordered_map]
    param_types = ["const TaggedUnion&"]
    setup = 'return TaggedUnion{MyUnion{std::unordered_map<std::string, std::string>{{"a", "b"}, {"c","d"}}}, 2};'
    expect_json = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "members":[
        {"name":"storage", "staticSize":56, "dynamicSize":0, "exclusiveSize":56, "NOT":"members"},
        {"name":"tag", "staticSize":1, "dynamicSize":0, "exclusiveSize":1, "NOT":"members"}
      ]}]'''
    expect_json_v2 = '''[
      {"staticSize":64, "dynamicSize":0, "exclusiveSize":7, "size":64, "members":[
        {"name":"storage", "staticSize":56, "dynamicSize":0, "exclusiveSize":56, "size":56, "members":[]},
        {"name":"tag", "staticSize":1, "dynamicSize":0, "exclusiveSize":1, "size":1, "members":[]}
      ]}]'''