In C++ coding, there are function macros for the fixed-width integer type that expands to an integer constant expression having the value specified by its argument. Their type is the promoted type of std::int_least8_t, std::int_least16_t, std::int_least32_t, and std::int_least64_t and unsigned versions of these types respectively. In this post, we explain these function macros for integer constants in Modern C++.
Table of Contents
What are function macros for signed integer constants?
Here are the function macros for the fixed-width integer type that expands to an integer constant expression having the value specified by its argument. Their type is the promoted type of std::int_least8_t, std::int_least16_t, std::int_least32_t and std::int_least64_t respectively,
| Fixed Width Integer Types | Description |
| INT8_C | expands to an integer constant whose type is std::int_least8_t |
| INT16_C | expands to an integer constant whose type is std::int_least16_t |
| INT32_C | expands to an integer constant whose type is std::int_least32_t |
| INT64_C | expands to an integer constant whose type is std::int_least64_t |
What are function macros for unsigned integer constants?
Here are the function macros for the fixed-width integer type that expands to an integer constant expression having the value specified by its argument. Their type is the promoted type of std::uint_least8_t, std::uint_least16_t, std::uint_least32_t and std::uint_least64_t respectively.
| Fixed Width Integer Types | Description |
| UINT8_C | expands to an unsigned integer constant whose type is std::uint_least8_t |
| UINT16_C | expands to an unsigned integer constant whose type is std::uint_least16_t |
| UINT32_C | expands to an unsigned integer constant whose type is std::uint_least32_t |
| UINT64_C | expands to an unsigned integer constant whose type is std::uint_least64_t |
What are other function macros for integer constants?
INTMAX_C function macro, expands to an integer constant whose type is std::intmax_t,
| Fixed Width Integer Types | Description |
| INTMAX_C | min. value of 8 bits signed integer type |
UINTMAX_C function macro, expands to an integer constant whose type is std::ıintmax_t,
| Fixed Width Integer Types | Description |
| UINTMAX_C | min. value of 8 bits signed integer type |
If you are looking more about Integer Constants there are more details about them, https://docwiki.embarcadero.com/RADStudio/Alexandria/en/Integer_Constants
If you are looking more about Declared Constants, you can follow this link: https://docwiki.embarcadero.com/RADStudio/Alexandria/en/Declared_Constants
Is there a simple C++ example of using function macros for integer constants?
Here is a very simple C++ example of how you can use function macros for integer constants.
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std::cout << INT8_C(-128) << std::endl; std::cout << UINT8_C(255) << std::endl; |
Is there a full C++ example of how to use function macros for integer constants?
Here is a full C++ example of how to use function macros for integer constants.
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#include <iostream> #include <tchar.h> int _tmain(int argc, _TCHAR* argv[]) { std::cout << INT8_C(-128) << std::endl; std::cout << UINT8_C(255) << std::endl; std::wcout << (wchar_t)INT16_C(-32767) << std::endl; std::wcout << (wchar_t)UINT16_C(655385) << std::endl; system("pause"); return 0; } |
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