TypeMeta¶

class TypeMeta¶

The meta class for all types.

TypeMeta is commonly used for type identification:

auto meta1 = dragon::TypeMeta::Make<float>();
auto meta2 = dragon::TypeMeta::Make<float>();
std::cout << (meta1 == meta2) << std::endl; // 1
std::cout << (meta1.id() == meta2.id()) << std::endl; // 1
std::cout << meta1.Match<float>() << std::endl; // 1
std::cout << (meta1.id() == dragon::TypeMeta::Id<float>()) << std::endl; // 1

Default constructor and destructor are available for non-fundamental types:

auto meta = dragon::TypeMeta::Make<std::string>();
auto* raw_string_data = malloc(1 * meta.itemsize());
meta.ctor()(raw_string_data, 1);
auto* string_data = reinterpret_cast<std::string*>(raw_string_data);
std::cout << string_data[0].size();
meta.dtor()(raw_string_data, 1);