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How to detect if a function is called as constructor?
...ert(isConstructor);
}
Obviously this is not ideal, since you now have an extra useless property on every object constructed by x that could be overwritten, but I think it's the best you can do.
(*) "instance of" is an inaccurate term but is close enough, and more concise than "object that has bee...
What are the differences between a pointer variable and a reference variable in C++?
..., the lifetime of that object becomes the lifetime of the reference.
std::string s1 = "123";
std::string s2 = "456";
std::string s3_copy = s1 + s2;
const std::string& s3_reference = s1 + s2;
In this example s3_copy copies the temporary object that is a result of the concatenation. Whereas s3...
How do I remove the old history from a git repository?
...ow this is almost the same aswer as @yoyodin, but there are some important extra commands and informations here. I tried to edit the answer, but since it is a substantial change to @yoyodin's answer, my edit was rejected, so here's the information!
...
Python memoising/deferred lookup property decorator
... Tip: Put a @wraps(fn) below @property to not loose your doc strings etc. (wraps comes from functools)
– letmaik
May 29 '14 at 10:12
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...
Access lapply index names inside FUN
...vector instead of the vector itself.
But note that you can always pass in extra arguments to the function, so the following works:
x <- list(a=11,b=12,c=13) # Changed to list to address concerns in commments
lapply(seq_along(x), function(y, n, i) { paste(n[[i]], y[[i]]) }, y=x, n=names(x))
He...
How to deal with page breaks when printing a large HTML table
...nge it to page-break-after:auto.
It will break correctly and not create an extra blank page.
<html>
<head>
<style>
@media print
{
table { page-break-after:auto }
tr { page-break-inside:avoid; page-break-after:auto }
td { page-break-inside:avoid; page-break-after:auto }...
How to unit test an object with database queries
...a, but applies to all OO-languages)
class Database {
public Result query(String query) {... real db here ...}
}
class MockDatabase extends Database {
public Result query(String query) {
return "mock result";
}
}
class ObjectThatUsesDB {
public ObjectThatUsesDB(Database db) {
this....
Why should the “PIMPL” idiom be used? [duplicate]
...
@Rob, I'm guessing there very little overhead to this. An extra class, but there is very little to them. Just a thin wrapper around the existing class. Someone correct me if I'm wrong, but the memory usage would just be an extra function table in RAM, a pointer to the pimpl and a re...
Why is a boolean 1 byte and not 1 bit of size?
...Obviously, such a pointer would not be convertible to void* because of the extra storage requirement for the bit number.
– Maxim Egorushkin
Jan 7 '11 at 17:10
...
Is there a better way to do optional function parameters in JavaScript? [duplicate]
...
+1, but typeof returns a string, so you need to put quotes around undefined for this to work: if(typeof myVariable == "undefined")...
– Richard Inglis
Jun 4 '12 at 15:10
...