includes = ["variant", "utility"]
definitions = '''
  struct Thrower {
    explicit Thrower(int) {}
    Thrower(const Thrower&) { throw std::domain_error("copy ctor"); }
    Thrower& operator=(const Thrower&) = default;
  };
'''

[cases]
  [cases.char_int64_1]
    param_types = ["const std::variant<char, int64_t>&"]
    setup = "return 'a';"
    expect_json = '''[{
      "staticSize":16,
      "dynamicSize":0,
      "exclusiveSize":15,
      "length":1,
      "capacity":1,
      "elementStaticSize":8,
      "members":[
        {"typeName":"char", "staticSize":1, "exclusiveSize":1, "dynamicSize":0}
      ]}]'''
  [cases.char_int64_2]
    param_types = ["const std::variant<char, int64_t>&"]
    setup = "return 1234;"
    expect_json = '''[{
      "staticSize":16,
      "dynamicSize":0,
      "exclusiveSize":8,
      "length":1,
      "capacity":1,
      "elementStaticSize":8,
      "members":[
        {"typeName":"long", "staticSize":8, "exclusiveSize":8, "dynamicSize":0}
      ]}]'''

  [cases.vector_int_1]
    param_types = ["const std::variant<std::vector<int>, int>&"]
    setup = "return std::vector<int>{1,2,3};"
    expect_json = '''[{
      "staticSize":32,
      "dynamicSize":12,
      "exclusiveSize":8,
      "length":1,
      "capacity":1,
      "elementStaticSize":24,
      "members":[
        {
          "typeName":"vector<int, std::allocator<int> >",
          "staticSize":24,
          "dynamicSize":12,
          "exclusiveSize":36,
          "length":3,
          "capacity":3,
          "elementStaticSize":4
        }
      ]}]'''
  [cases.vector_int_2]
    param_types = ["const std::variant<std::vector<int>, int>&"]
    setup = "return 123;"
    expect_json = '''[{
      "staticSize":32,
      "dynamicSize":0,
      "length":1,
      "capacity":1,
      "elementStaticSize":24,
      "members":[
        {
          "typeName":"int",
          "staticSize":4,
          "dynamicSize":0
        }
      ]}]'''

  [cases.optional]
    # This test case ensures that the alignment of std::variant is set
    # correctly, as otherwise the size of the std::optional would be wrong
    param_types = ["const std::optional<std::variant<char, int64_t>>&"]
    setup = "return 123;"
    expect_json = '''[{
      "staticSize":24,
      "dynamicSize":0,
      "exclusiveSize":8,
      "length":1,
      "capacity":1,
      "elementStaticSize":16,
      "members":[
        {
          "staticSize":16,
          "dynamicSize":0,
          "exclusiveSize":8,
          "length":1,
          "capacity":1,
          "elementStaticSize":8,
          "members":[
            {"typeName":"long", "staticSize":8, "exclusiveSize":8, "dynamicSize":0}
          ]
        }
      ]}]'''

  [cases.empty]
    # https://en.cppreference.com/w/cpp/utility/variant/valueless_by_exception
    param_types = ["const std::variant<int, Thrower>&"]
    setup = '''
      std::variant<int, Thrower> var{123};
      try {
        var = Thrower(456);
      }
      catch (const std::domain_error &ex) {
        // Ignore
      }
      return var;
    '''
    expect_json = '''[{
      "staticSize":8,
      "dynamicSize":0,
      "exclusiveSize":8,
      "length":1,
      "capacity":1,
      "elementStaticSize":4,
      "NOT":"members"
      }]'''

  # With less than 256 options, parameter indexes are stored in a uint8_t and
  # the invalid index value is 0xff. These tests check that we regonise that
  # 0xff can be a valid index if there are at least 256 parameters, and that
  # the invalid index value is raised to 0xffff.
  [cases.256_params_256]
    param_types = ["const std::variant<Thrower,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,char>&"]
    setup = "return 'a';"
    expect_json = '''[{
      "staticSize":8,
      "dynamicSize":0,
      "exclusiveSize":7,
      "length":1,
      "capacity":1,
      "elementStaticSize":4,
      "members":[
        {"typeName":"char", "staticSize":1, "exclusiveSize":1, "dynamicSize":0}
      ]}]'''
  [cases.256_params_empty]
    param_types = ["const std::variant<Thrower,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,char>&"]
    setup = '''
      std::variant<Thrower,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,char> var{'a'};
      try {
        var = Thrower(456);
      }
      catch (const std::domain_error &ex) {
        // Ignore
      }
      return var;
    '''
    expect_json = '''[{
      "staticSize":8,
      "dynamicSize":0,
      "length":1,
      "capacity":1,
      "elementStaticSize":4,
      "NOT":"members"
      }]'''