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Regular cast vs. static_cast vs. dynamic_cast [duplicate]
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If a reference is converted instead of a pointer, the dynamic cast will then fail by throwing a bad_cast exception. This needs to be handled using a try-catch statement.
#include <exception>
// …
try
{
MyChild &child = dynamic_cast<MyChild&>(*base);
}
catch(std::bad_ca...
How do you print in a Go test using the “testing” package?
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If I run go test -v, I get no log output until all of TestFoo is done, then no output until all of TestBar is done, and again no more output until all of TestBaz is done.
This is fine if the tests are working, but if there is some sort of bug, there are a few cases where buffering log output i...
Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
...d=gnu99 file.c -o m
where file.c is the name of your C source code file, then you'll get executable, called m in your directory. Most likely you'll need permissions to write into mouse device directly, so you may use sudo:
user@host:/path$ sudo ./m
Other OS
The logic will remain same:
Find a...
What is the difference between a process and a thread?
...ng. If both processes and threads were independent sequences of execution, then a process that contained two threads would have to have three sequences of execution, and that can't be right. Only a thread is a sequence of execution -- a process is a container that can hold one or more sequences of e...
How do I use valgrind to find memory leaks?
...the allocated memory somewhere else
and change the pointer's location. We then leave resizeArray without telling
array->data where the array was moved to.
Invalid write
1 errors in context 1 of 1:
Invalid write of size 1
at 0x4005CA: main (main.c:10)
Address 0x51f905a is 0 bytes after a b...
How to create the most compact mapping n → isprime(n) up to a limit N?
..., you should probably run a probabilistic test since those are faster, and then follow it up with a deterministic test to make sure the number is prime.
You should know that the math behind the fastest algorithms is not for the faint of heart.
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All permutations of a Windows license key
...you use the Windows Anytime Upgrade option directly from within Windows 7, then you do NOT need to know what the license key is.
As long as the operating system is activated then Windows 8 will just overwrite the existing operating system and place everything from Windows 7 into a "Windows-old" fol...
Resizing an image in an HTML5 canvas
...won't give you good enough resampling quality? You implement them yourself then! Oh come on, we're entering the new age of Web 3.0, HTML5 compliant browsers, super optimized JIT javascript compilers, multi-core(†) machines, with tons of memory, what are you afraid of? Hey, there's the word java in...
What are the rules about using an underscore in a C++ identifier?
...I think that still allows using names like "foo_t" - but i think these are then reserved by POSIX.
– Johannes Schaub - litb
Sep 20 '09 at 1:39
61
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What's the difference between => , ()=>, and Unit=>
...: => Int) = x * x
If I call it like this
var y = 0
f { y += 1; y }
Then the code will execute like this
{ y += 1; y } * { y += 1; y }
Though that raises the point of what happens if there's a identifier name clash. In traditional call-by-name, a mechanism called capture-avoiding substitut...