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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...ng the wrong direction. Interestingly enough, we could solve this problem by making List contravariant in A, but then the return type List[A] would be invalid as the cons function expects its return type to be covariant.
Our only two options here are to a) make A invariant, losing the nice, intuit...
Optimizing away a “while(1);” in C++0x
...next) {
++count2;
}
Could these two loops be merged and replaced by the following loop?
for (p = q; p != 0; p = p -> next) {
++count;
++count2;
}
Without the special dispensation in 6.8.5p6 for infinite loops, this
would be disallowed: If the first loop doesn't ...
Function pointers, Closures, and Lambda
...e lessThan was not in scope, I would either have to manually keep it alive by passing it to each function in the chain, or by promoting it to a global.
Though most mainstream languages that support closures use anonymous functions, there is no requirement for that. You can have closures without ano...
What's the difference between @Component, @Repository & @Service annotations in Spring?
...Therefore, you can annotate your component classes with @Component,
but, by annotating them with @Repository, @Service, or @Controller
instead, your classes are more properly suited for processing by tools
or associating with aspects.
For example, these stereotype annotations
make idea...
Difference between ref and out parameters in .NET [duplicate]
... returning to the caller, which is in opposition to ref, which must be set by the caller before calling the callee.
– Jesse C. Slicer
Feb 5 '10 at 20:18
3
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Populating Spring @Value during Unit Test
...
Or even without Spring dependencies at all by changing the field to default access (package protected) to make it simply accessible to the test.
– Arne Burmeister
Jan 13 '16 at 10:03
...
Which is faster : if (bool) or if(int)?
...mpare a bool, the compiler generates code to isolate the least significant byte of the 32-bit argument that g receives, and compares it with cmpb. In the first example, the int argument uses the full 32 bits that were pushed onto the stack, so it simply compares against the whole thing with cmpl.
...
Visual Studio support for new C / C++ standards?
... between platforms. Also, the Intel compiler works in visual studio. So by scrapping MS COMPILER you can still use the MS IDE that you seem to think has some kind of value, and use C99 to your hearts content.
A more sensible approach is honestly to move over to Intel CC or gcc, and use Eclipse fo...
Difference between method and function in Scala
...ng! The distinction is that a Method Value is created from methods, either by postfixing an underscore (m _ is a method value corresponding to the "function declaration" (def) m), or by a process called eta-expansion, which is like an automatic cast from method to function.
That is what the specs s...
Best way to split string into lines
...s ugly, just remove the unnecessary ToCharArray call.
If you want to split by either \n or \r, you've got two options:
Use an array literal – but this will give you empty lines for Windows-style line endings \r\n:
var result = text.Split(new [] { '\r', '\n' });
Use a regular expression, as in...