stduint64t

stduint64t is a type defined in the C++ standard library, specifically within the <cstdint> header. It represents an unsigned integer type with a guaranteed minimum size of 64 bits. This means it can store values from 0 up to at least 2^64 - 1. The "stduint" prefix indicates it's a standard unsigned integer, and "64t" specifies its size.

The primary purpose of stduint64t is to provide portability and predictability when dealing with large integer values across different platforms and compilers. Without fixed-width integer types, the size of a standard `unsigned long long` might vary, leading to unexpected behavior when code is compiled on systems with different architectures. By using stduint64t, developers can ensure that a 64-bit unsigned integer behaves consistently everywhere.

This type is particularly useful in scenarios involving large numerical data, such as file sizes, network packet counters, timestamps, or any application where the range of a 32-bit integer is insufficient. It is important to note that stduint64t is guaranteed to be *at least* 64 bits; on some systems, it might be larger if the native integer types support it. However, its minimum size is the key guarantee.