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Showing content from https://gammasoft71.github.io/xtd/docs/documentation/guides/xtd.core/types_overview/types below:

Types in xtd | xtd

Types in xtd

By design xtd has defined its own types which are only ever aliases to the fixed integer types of c++.
You are not obliged to use the xtd types, you are even encouraged to use the standard types or those you want.
The xtd defines unboxed and boxed types listed below. The unboxed types is same as the native type. The boxed type is an xtd::box inherited from xtd::object.

For more performance prefere used unboxed type. Used boxed type when necessary, e.g., to parse, polymorphism, ...

Types list

(1) Depend of OS : if build on Windows is 2 bytes, if build on Linux or many other non-Windows systems is 4 bytes.

(2) Depend of build : if build in 32 bits the size is 4 bytes, if build in 64 bits the size is 8 bytes.

(3) xtd::decimal is an extended precision floating-point type. Matches IEEE-754 binary128 format if supported, otherwise matches IEEE-754 binary64-extended format if supported, otherwise matches some non-IEEE-754 extended floating-point format as long as its precision is better than binary64 and range is at least as good as binary64, otherwise matches IEEE-754 binary64 format.

binary128 format is used by some HP-UX, SPARC, MIPS, ARM64, and z/OS implementations.
The most well known IEEE-754 binary64-extended format is 80-bit x87 extended precision format. It is used by many x86 and x86-64 implementations (a notable exception is MSVC, which implements long double in the same format as double, i.e. binary64).

(4) The std::string type is the main string datatype in standard C++ since 1998, but it was not always part of C++98.

For more information about c++ type see cppreference language type section.

For the complete list of xtd types see xtd - Referecne Guide - types section.

Limits

xtd define the minimum and maximum constant value for each types.

Of course, std::numeric_limits works for the types described above except for xtd::date_time.

Boxing

For explicit boxing a type into corresponding object class use xtd::boxing method. By default, the boxing implicit in the corresponding object is used.

bool value_unboxed = true;
xtd::boolean_object value_boxed1 = value_unboxed;               
xtd::boolean_object value_boxed2 = xtd::boxing(value_unboxed);  
auto ready_boxed3 = xtd::boxing(value_unboxed);

Unboxing

For explicit unboxing a object class into corresponding type use xtd::unboxing method. By default, the unboxing implicit in the corresponding type is used.

xtd::boolean_object value_boxed = true;
bool value_unboxed1 = value_boxed;                 
bool value_unboxed2 = xtd::unboxing(value_boxed);  
auto value_unboxed3 = xtd::unboxing(value_boxed);