How is it a keyword and an instance of a type? This isn’t surprising. Both true and false are keywords and as literals they have a type ( bool ). nullptr is a pointer literal of type std::nullptr_t, and it’s a prvalue (you cannot take the address of it using &). 4.10 about pointer conversion … Read more
Shared libraries are .so (or in Windows .dll, or in OS X .dylib) files. All the code relating to the library is in this file, and it is referenced by programs using it at run-time. A program using a shared library only makes reference to the code that it uses in the shared library. Static … Read more
How to read: This article is rather long. If you want to know about both aggregates and PODs (Plain Old Data) take time and read it. If you are interested just in aggregates, read only the first part. If you are interested only in PODs then you must first read the definition, implications, and examples … Read more
I think it is too early to give a “best practices” answer for this as there hasn’t been enough time to use it in practice. If this was asked about throw specifiers right after they came out then the answers would be very different to now. Having to think about whether or not I need … Read more
Reviewing the basic terminology It’s usually good enough – unless you’re programming assembly – to envisage a pointer containing a numeric memory address, with 1 referring to the second byte in the process’s memory, 2 the third, 3 the fourth and so on…. What happened to 0 and the first byte? Well, we’ll get to … Read more
Because iostream::eof will only return true after reading the end of the stream. It does not indicate, that the next read will be the end of the stream. Consider this (and assume then next read will be at the end of the stream): while(!inStream.eof()){ int data; // yay, not end of stream yet, now read … Read more
The problem you describe can be solved by defining the template in the header, or via the approach you describe above. I recommend reading the following points from the C++ FAQ Lite: Why can’t I separate the definition of my templates class from its declaration and put it inside a .cpp file? How can I … Read more
The varying line-ending characters don’t matter, assuming the file is open in text mode, which is what you get unless you ask for binary. The compiled program will write out the correct thing for the system compiled for. The only difference is that std::endl flushes the output buffer, and ‘\n’ doesn’t. If you don’t want … Read more
To delete a single element, you could do: std::vector<int> vec; vec.push_back(6); vec.push_back(-17); vec.push_back(12); // Deletes the second element (vec[1]) vec.erase(std::next(vec.begin())); Or, to delete more than one element at once: // Deletes the second through third elements (vec[1], vec[2]) vec.erase(std::next(vec.begin(), 1), std::next(vec.begin(), 3));
The reason Herb said what he said is because of cases like this. Let’s say I have function A which calls function B, which calls function C. And A passes a string through B and into C. A does not know or care about C; all A knows about is B. That is, C is … Read more