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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
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struct test t;
我们用gdb跟进去，对于实例t，我们可以看到：
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# t实例中的p就是一个野指针
(gdb) p t
$1 = {i = 0, c = 0 '\000', d = 0...
Fetch the row which has the Max value for a column
Table:
35 Answers
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How does Activity.finish() work in Android?
...lled finish() will run to completion. The finish() operation will not even begin until you return control to Android.
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PostgreSQL: Can you create an index in the CREATE TABLE definition?
I want to add indexes to some of the columns in a table on creation. Is there are way to add them to the CREATE TABLE definition or do I have to add them afterward with another query?
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Which iomanip manipulators are 'sticky'?
I recently had a problem creating a stringstream due to the fact that I incorrectly assumed std::setw() would affect the stringstream for every insertion, until I changed it explicitly. However, it is always unset after the insertion.
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When should you not use virtual destructors?
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There is no need to use a virtual destructor when any of the below is true:
No intention to derive classes from it
No instantiation on the heap
No intention to store in a pointer of a superclass
No specific reason to avoid it unless you are really so pressed for memory.
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How to keep a git branch in sync with master
At the moment git is doing my head in, I cannot come up with the best solution for the following.
6 Answers
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How to catch integer(0)?
...of printing a zero length vector (an integer one), so you could test for a being of length 0:
R> length(a)
[1] 0
It might be worth rethinking the strategy you are using to identify which elements you want, but without further specific details it is difficult to suggest an alternative strategy....
Count number of objects in list [closed]
R function that will return the number of items in a list?
5 Answers
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Can someone explain Microsoft Unity?
I've been reading the articles on MSDN about Unity (Dependency Injection, Inversion of Control), but I think I need it explained in simple terms (or simple examples). I'm familiar with the MVPC pattern (we use it here), but I just can't really grasp this Unity thing yet, and I think it's the next st...