Timeline for Checking endianness at compile-time
Current License: CC BY-SA 3.0
8 events
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| Jul 1, 2016 at 10:27 | comment | added | barak manos |
@FaTony: I have pretty much mentioned that in you will have to... make sure that it is placed in a memory address aligned to 4 bytes (and that by itself might yield some platform-dependency issues...).
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| Jul 1, 2016 at 8:44 | comment | added | user109835 | -1, this violates strict aliasing rules. | |
| Mar 29, 2014 at 19:17 | comment | added | barak manos |
@icdae: Please note the emphasis on the word Alternatively, which means that you should leave endianValues[4] = {0, 1, 2, 3} as is, but read it using *(uint32_t*)endianValues). The value variable is meant to be used only in the first option suggested.
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| Mar 29, 2014 at 18:37 | comment | added | icdae |
Oops, I misspoke (just woke up, everything's a bit fuzzy); being a pointer to a constant value won't change how the value itself is stored in memory. The function will always return the same result since value = HL_LITTLE_ENDIAN. As for the switch statement, one of the restrictions for a constexpr statement is that the body of the function can only consist of a single return statement. In this case the switch can be converted to a simple series of ternary operators.
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| Mar 29, 2014 at 18:21 | comment | added | barak manos |
@icdae: It's not an 8-bit pointer, it's a 32-bit pointer (look inside the switch statement that you removed). Though I have to admit, I'm not really sure how it is applied into a constexpr during compile-time.
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| Mar 29, 2014 at 18:17 | comment | added | icdae |
I tried your solution (had to remove the switch statement to make it a constexpr function) but I believe this will always return as little endian. Since the value stored in HL_LITTLE_ENDIAN is how it will actually be stored in memory on all computers, retrieving an 8-bit pointer to value is always going to grab the same value of 0x03. I tried another solution though end edited it into the original question.
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| Mar 29, 2014 at 17:59 | history | edited | barak manos | CC BY-SA 3.0 |
added 724 characters in body
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| Mar 29, 2014 at 17:42 | history | answered | barak manos | CC BY-SA 3.0 |