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c++ Programming Glossary: let'sIn C++, why use static_cast<int>(x) instead of (int)x? http://stackoverflow.com/questions/103512/in-c-why-use-static-castintx-instead-of-intx and disperse pieces of code and knowing all the rules. Let's assume these class CMyClass public CMyBase ... class CMyOtherStuff..
Why aren't my include guards preventing recursive inclusion and multiple symbol definitions? http://stackoverflow.com/questions/14909997/why-arent-my-include-guards-preventing-recursive-inclusion-and-multiple-symbol however no infinite recursion will be set up in step 4. Let's see why same as before When parsing main.cpp the preprocessor..
Do-While and if-else statements in C/C++ macros http://stackoverflow.com/questions/154136/do-while-and-if-else-statements-in-c-c-macros a semicolon after your macro always means the same thing. Let's say you had something like your second macro. #define BAR X..
Why does an overridden function in the derived class hide other overloads of the base class? http://stackoverflow.com/questions/1628768/why-does-an-overridden-function-in-the-derived-class-hide-other-overloads-of-the and all calls to foo NULL are resolved to B foo void . Let's say there's no name hiding and this B foo void is visible in..
Undefined, unspecified and implementation-defined behavior http://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior many C compilers will not report any errors in the program Let's look at a classic example #include iostream int main char p..
http://stackoverflow.com/questions/3106110/what-is-move-semantics it easiest to understand move semantics with example code. Let's start with a very simple string class which only holds a pointer.. you now understand the basics of move semantics Let's continue by implementing the assignment operator. If you're..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom std swap would entail. An in depth explanation The goal Let's consider a concrete case. We want to manage in an otherwise..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c up. So let's try a different example using our File class. Let's say we want to use a file as a log. This means we want to open..
http://stackoverflow.com/questions/402283/stdwstring-vs-stdstring char nor wchar_t is directly tied to unicode. On Linux Let's take a Linux OS My Ubuntu system is already unicode aware. When..
What are Aggregates and PODs and how/why are they special? http://stackoverflow.com/questions/4178175/what-are-aggregates-and-pods-and-how-why-are-they-special or a POD union. Wow this one's tougher to parse isn't it Let's leave unions out on the same grounds as above and rephrase in..
Undefined Behavior and Sequence Points Reloaded http://stackoverflow.com/questions/4638364/undefined-behavior-and-sequence-points-reloaded Installment Undefined Behavior and Sequence Points Let's revisit this funny and convoluted expression the italicized..
What are the barriers to understanding pointers and what can be done to overcome them? http://stackoverflow.com/questions/5727/what-are-the-barriers-to-understanding-pointers-and-what-can-be-done-to-overcome of explaining memory and pointers it is accurate enough. Let's assume the THouse class used below looks like this type THouse..
Where and why do I have to put the “template” and “typename” keywords? http://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords this is specified at 14.6.2 1 . The typename keyword Let's get back to our initial problem how can we parse t x f The answer..
Do the parentheses after the type name make a difference with new? http://stackoverflow.com/questions/620137/do-the-parentheses-after-the-type-name-make-a-difference-with-new new operator c faq share improve this question Let's get pedantic because there are differences that can actually..
Difference between private, public, and protected inheritance in C++ http://stackoverflow.com/questions/860339/difference-between-private-public-and-protected-inheritance-in-c happens with public private and protected inheritance. Let's consider a class Base and a class Child that inherits from Base...
What is “rvalue reference for *this”? http://stackoverflow.com/questions/8610571/what-is-rvalue-reference-for-this of the object a member function or operator is called on. Let's take the first example at the top of this post. After the aforementioned.. the argument list will only contain that object argument. Let's see how that looks like first call to 'f' in 'main' test t f1..
http://stackoverflow.com/questions/988158/take-the-address-of-a-one-past-the-end-array-element-via-subscript-legal-by-the you're not actually using an out of bounds pointer. Let's deal with out of bounds pointers first because that's how I..
In C++, why use static_cast<int>(x) instead of (int)x? http://stackoverflow.com/questions/103512/in-c-why-use-static-castintx-instead-of-intx Safe as long as we checked but harder to read However let's see this almost identical code CMyOtherStuff pOther pOther static_cast..
Why do people say there is modulo bias when using a random number generator? http://stackoverflow.com/questions/10984974/why-do-people-say-there-is-modulo-bias-when-using-a-random-number-generator number between say 0 and 2. For the sake of explanation let's say RAND_MAX is 10 and I decide to generate a random number..
Why aren't my include guards preventing recursive inclusion and multiple symbol definitions? http://stackoverflow.com/questions/14909997/why-arent-my-include-guards-preventing-recursive-inclusion-and-multiple-symbol in mutually including headers . To see what this means let's start with a basic scenario and see why include guards do help..
Why does an overridden function in the derived class hide other overloads of the base class? http://stackoverflow.com/questions/1628768/why-does-an-overridden-function-in-the-derived-class-hide-other-overloads-of-the drastic shift in overload resolution results. For example let's say the base class B has a member function foo that takes a.. in many different classes descending from B . However let's say in some indirect remote descendant D of class B a function..
http://stackoverflow.com/questions/162941/why-use-pointers anything linked lists members of structs and so on. Buty let's not go into that here. How do you use pointers with arrays With..
http://stackoverflow.com/questions/1761626/weighted-random-numbers in equity analysis I'm using Boost's random functions. So let's say I want to pick a random number between 1 and 3 so either..
How do you reverse a string in place in C or C++? http://stackoverflow.com/questions/198199/how-do-you-reverse-a-string-in-place-in-c-or-c you must avoid swapping with self because a^a 0. Ok fine let's fix the UTF 8 chars... #include bits types.h #include stdio.h..
http://stackoverflow.com/questions/3582001/advantages-of-using-forward the ugly. static_cast T is cryptic and weird to remember let's instead make a utility function called forward which does the..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c the compiler can do some cleverness to speed things up. So let's try a different example using our File class. Let's say we want.. just that we've got a file to be used as a log Now let's set our file as the log for a couple of other objects void setLog..
What are Aggregates and PODs and how/why are they special? http://stackoverflow.com/questions/4178175/what-are-aggregates-and-pods-and-how-why-are-they-special classes clause 10 and no virtual functions 10.3 . So OK let's parse this definition. First of all any array is an aggregate... even it is an array of non aggregate class type. Now let's look at some examples class NotAggregate1 virtual void f remember.. void f ok just a private function You get the idea. Now let's see how aggregates are special. They unlike non aggregate classes..
When to use virtual destructors? http://stackoverflow.com/questions/461203/when-to-use-virtual-destructors that I didn't declare Base's destructor to be virtual. Now let's have a look at the following snippet Base b new Derived use..
Why can templates only be implemented in the header file? http://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-file reading this line the compiler will create a new class let's call it FooInt which is equivalent to the following struct FooInt..
Can a local variable's memory be accessed outside its scope? http://stackoverflow.com/questions/6441218/can-a-local-variables-memory-be-accessed-outside-its-scope with a room number higher than you has checked out. So let's think about the stack. In many operating systems you get one..
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