C and C++ notes / Types and values, and strings: Difference between revisions
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Pointer size is also implied by architecture. There are a few acronyms used to refer to how different systems do things. For example, | Pointer size is also implied by architecture. | ||
There are a few acronyms used to refer to how different systems do things. For example, | |||
* Most 64-bit unices are LP64 | * Most 64-bit unices are LP64 | ||
* 64-bit windows is LLP64 | * 64-bit windows is LLP64 | ||
* 32-bit windows and most 32-bit unices are ILP32. (long long being either not explicitly settled, or settled at 64-bit) | * 32-bit windows and most 32-bit unices are ILP32. (long long being either not explicitly settled, or settled at 64-bit) | ||
More of them: | More of them: | ||
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LP64 64 (32) 64 (64) | LP64 64 (32) 64 (64) | ||
ILP64 64 64 64 (64) | ILP64 64 64 64 (64) | ||
Notes: | Notes: | ||
* refers to size of long & pointer, int & long & pointer, or long-long & pointer | * refers to size of long & pointer, int & long & pointer, or long-long & pointer | ||
* Bracketed values are those that seem to be implied{{verify}} | * Bracketed values are those that seem to not be settled, but so typical you can consider them implied unless settled otherwise{{verify}} | ||
* The safest, most portable use of integer types is to use specific-sized integers (or, almost as good: always use long long). | * The safest, most portable use of integer types is to use specific-sized integers (or, ''almost'' as good as advice: "always use long long if you mean that"). | ||
* Enough programmers make bad assumptions based on their machines, which may not be true when compiled on a another or a later architecture. Often simple enough to fix since it was based on a specific size. | * Enough programmers make bad assumptions based on their machines, which may not be true when compiled on a another or a later architecture. Often simple enough to fix since it was based on a specific size. | ||
Revision as of 17:11, 27 February 2024
Notes related to C and C++
Note: Some notes describe behaviour common to most variants - for C mostly meaning C89 (and a bit of C99), unless mentioned otherwise. |
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.