If you know what you’re doing, you can make a vector of references using std::reference_wrapper: #include <functional> #include <vector> int main() { std::vector<std::reference_wrapper<int>> iv; int a = 12; iv.push_back(a); // or std::ref(a) // now iv = { 12 }; a = 13; // now iv = { 13 }; } Note of course that any … Read more
Yes, its a bug. This is something new and was voted in the working paper in February 2012 (link). Nicol Bolas makes a good point in that gcc is actually the conforming compiler according to the FDIS approved C++11 standard because the changes to the working paper were made after that.
In my case it was a project defined using Target Framework: “.NET Framework 4.0 Client Profile ” that tried to reference dll projects defined using Target Framework: “.NET Framework 4.0”. Once I changed the project settings to use Target Framework: “.NET Framework 4.0” everything was built nicely. Right Click the project->Properties->Application->Target Framework
Here’s the ‘Second Informal Review Draft’ of SQL:1992, which seems to have been accurate enough for everything I’ve looked up. 1992 covers most of the stuff routinely used across DBMSs.
Got it: db.post.find({‘author.$id’: ‘foo’})
Every variable in Java is a reference. So when you do SomeClass s2 = s1; you just point s2 to the same object as s1 points to. You are actually assigning the value of the reference s1 (which points to an instance of SomeClass) to s2. If you modify s1, s2 will be modified as … Read more
There is no difference unless you write something weird like (v1 += v2) = v3; In the first case, the assignment will be to a temporary, and the overall effect will be v1 += v2. In the second case, the assignment will be to v1, so the overall effect will be v1 = v3. In … Read more
If you don’t want to change anything in your php.ini file, according to PHP documentation, you can do this. error_log(“Error message\n”, 3, “/mypath/php.log”); The first parameter is the string to be sent to the log. The second parameter 3 means expect a file destination. The third parameter is the log file path.
I suggest you use a Cow, since your BorrowedOrOwned has no difference to Cow except that it has fewer convenience methods. Anybody that gets a hold of a BorrowedOrOwned object could match on it and get the owned value or a mutable reference to it. If you want to prevent the confusion of being able … Read more
You don’t have to create the default vector if you don’t use it. You just have to ensure the declaration is done outside the if block. fn accept(input: &Vec<String>) { let def; let vec = if input.is_empty() { def = vec![“empty”.to_string()]; &def } else { input }; // … do something with `vec` } Note … Read more