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| 21:31 |
erlehmann |
<sfan5> how would new[] know how many objects are in the array? |
| 21:31 |
erlehmann |
well i thought i do “char *p = new char[10];” and the magic happens |
| 21:31 |
sfan5 |
did you even read the documentation I linked? |
| 21:31 |
sfan5 |
just the function signature would be enough |
| 21:32 |
sfan5 |
void* operator new ( std::size_t count ); |
| 21:32 |
sfan5 |
void* operator new[]( std::size_t count ); |
| 21:32 |
erlehmann |
ok |
| 21:32 |
erlehmann |
what do the [] then mean if not syntactic sugar? |
| 21:33 |
sfan5 |
grossly simplified the line you pasted is equivalent to "char *p = operator new[](sizeof(char) * 10);" |
| 21:34 |
sfan5 |
where operator new[] is just a weirdly named function |
| 21:34 |
erlehmann |
ok |
| 21:34 |
sfan5 |
worth pointing out that initialization of the objects does not happen inside operator new[] |
| 21:37 |
erlehmann |
i have to look into this more to understand it |
| 21:48 |
erlehmann |
i rest |
| 21:48 |
GNUHacker |
any optifine's like shaders 4 minetest? |
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| 22:21 |
erlehmann |
sfan5, before going to sleep: my understanding is that confusing delete and delete[] may result in heap corruption depending on whateve the implementation does behind the curtainr. i will hive to use a debugger. |
| 22:21 |
erlehmann |
curtain |
| 22:21 |
sfan5 |
it may result in anything |
| 22:21 |
Hawk777 |
It can also result in destructors only being run on the first object in the array, even if the heap is actually kept intact; that is another possible outcome. Of course it’s UB so really anything can happen. |
| 22:21 |
erlehmann |
uh |
| 22:22 |
erlehmann |
if it's UB, then i definitely should stop looking how it's implemented |
| 22:22 |
erlehmann |
as that doesn't help me understanding a thing |
| 22:23 |
erlehmann |
thanks, both of you |
| 22:23 |
Hawk777 |
“In the first alternative (delete object), the value of the operand of delete may be a null pointer value, a pointer to a ***non-array*** object created by a previous new-expression, or a pointer to a subobject (4.5) representing a base class of such an object (Clause 13). If not, the behavior is undefined.” so yeah, UB. |
| 22:24 |
Hawk777 |
The next sentence says the same about the converse (delete[] must be used only on things made by new[]). |
| 22:37 |
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