Is there any way to do something like this in C++:
int a;
bitset<a>;
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1What do you mean more precisely? – Mattia F. Jul 09 '16 at 15:05
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In fact i accidently submitted it when it wasn't finished. I supposed to mean can i make something like bitset; when a is an int – user6568979 Jul 09 '16 at 15:06
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1@user6568979 You can [edit] your question to fix it. – Baum mit Augen Jul 09 '16 at 15:07
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@user6568979 But no, you cannot do that. Template arguments need to be compile time constants. – Baum mit Augen Jul 09 '16 at 15:07
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What are you wanting to have it do? – brian beuning Jul 09 '16 at 16:23
1 Answers
2
No it's not possible, since std::bitset<> expects a constant bitsize value, that can be resolved at compile time.
What you can do though is providing a const value:
const int a = 42;
// ^^^^^
bitset<a>;
As mentioned in the other answer, there's not really a dynamically sized bitset provided from the current c++ standard (The std::vector<bool> specialization has serious drawbacks regarding usage in standard algorithms).
