Contains system classes. 
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| class   | xtd::any_object | 
|   | Represent a polymorphic wrapper capable of holding any type.  More...
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| class   | xtd::array< type_t, rank_, allocator_t > | 
|   | Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays.  More...
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| class   | xtd::array< type_t, 1, allocator_t > | 
|   | Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays.  More...
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| class   | xtd::array< type_t, 2, allocator_t > | 
|   | Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays.  More...
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| class   | xtd::array< type_t, 3, allocator_t > | 
|   | Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays.  More...
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| class   | xtd::array_abstract_object | 
|   | Abstract object that represent array.  More...
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| class   | xtd::array<> | 
|   | Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays.  More...
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| class   | xtd::basic_array< type_t, allocator_t > | 
|   | Base object that represent array.  More...
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| class   | xtd::basic_string< char_t, traits_t, allocator_t > | 
|   | Represents text as a sequence of character units.  More...
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| class   | xtd::bit_converter | 
|   | Converts base data types to an std::vector of bytes, and an std::vector of bytes to base data types.  More...
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| class   | xtd::box< type_t > | 
|   | Represents a boxed object.  More...
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| class   | xtd::box_char< type_t > | 
|   | Represents a boxed char object.  More...
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| class   | xtd::box_floating_point< type_t > | 
|   | Represents a boxed floating point object.  More...
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| class   | xtd::box_integer< type_t > | 
|   | Represents a boxed integer object.  More...
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| class   | xtd::console | 
|   | Represents the standard input, output, and error streams for console applications.  More...
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| class   | xtd::convert | 
|   | Represents API to convert base type code.  More...
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| class   | xtd::convert_pointer | 
|   | Represents API to convert pointers.  More...
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| class   | xtd::convert_string | 
|   | Represents API to convert string containers.  More...
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| class   | xtd::date_time | 
|   | Represents an instant in time, typically expressed as a date and time of day.  More...
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| class   | xtd::delegate< result_t(arguments_t...)> | 
|   | Represents a delegate, which is a data structure that refers to a static method or to a class instance && an instance method of that class.  More...
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| class   | xtd::enum_object< enum_t > | 
|   | Provides the base class for enumerations.  More...
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| class   | xtd::enum_object< std::nullptr_t > | 
|   | Provides the base class for enumerations.  More...
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| struct   | xtd::enum_register< enum_t > | 
|   | Provides the registration struct for enumerations.  More...
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| struct   | xtd::enum_set_attribute< enum_t > | 
|   | Provides the set attribute struct for enumerations.  More...
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| class   | xtd::environment | 
|   | The environment class.  More...
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| struct   | xtd::guid | 
|   | Represents a globally unique identifier (GUID). A GUID is a 128-bit integer (16 bytes) that can be used across all computers and networks wherever a unique identifier is required. Such an identifier has a very low probability of being duplicated.  More...
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| class   | xtd::hash_code | 
|   | Combines the hash code for multiple values into a single hash code.  More...
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| class   | xtd::math | 
|   | Provides constants and static methods for trigonometric, logarithmic, and other common mathematical functions.  More...
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| class   | xtd::memory_information | 
|   | Represents information about the memory. This class is static.  More...
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| class   | xtd::object | 
|   | Supports all classes in the xtd class hierarchy and provides low-level services to derived classes. This is the ultimate base class of all classes in the xtd. It is the root of the type hierarchy.  More...
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| class   | xtd::random | 
|   | Represents a pseudo-random number generator, a device that produces a sequence of numbers that meet certain statistical requirements for randomness.  More...
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| class   | xtd::runtime::exception_services::exception_dispatch_info | 
|   | Represents an exception whose state is captured at a certain point in code.  More...
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| class   | xtd::startup | 
|   | Defines the xtd::startup object that can be used in the main method to safely call the application's main entry point.  More...
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| class   | xtd::text::basic_string_builder< char_t, traits_t, allocator_t > | 
|   | Represents a mutable string of characters. This class cannot be inherited.  More...
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| struct   | xtd::time_span | 
|   | Represents a time interval.  More...
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| class   | xtd::time_zone_info | 
|   | Represents any time zone in the world.  More...
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| class   | xtd::time_zone_info::transition_time | 
|   | Provides information about a specific time change, such as the change from daylight saving time to standard time or vice versa, in a particular time zone.  More...
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| class   | xtd::time_zone_info::adjustement_rule | 
|   | Provides information about a time zone adjustment, such as the transition to and from daylight saving time.  More...
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| class   | xtd::translator | 
|   | Represents translator class. This class cannot be inherited.  More...
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| class   | xtd::type_object | 
|   | Represents type declarations: class types, interface types, array types, value types, enumeration types, type parameters, generic type definitions, and open or closed constructed generic types.  More...
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| class   | xtd::uri | 
|   | Provides an object representation of a uniform resource identifier (URI) and easy access to the parts of the URI.  More...
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| class   | xtd::version | 
|   | Represents the version number of an assembly, operating system, or the xtd. This class cannot be inherited.  More...
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