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c++ Programming Glossary: barwhat is the difference between const int*, const int * const, int const * http://stackoverflow.com/questions/1143262/what-is-the-difference-between-const-int-const-int-const-int-const are clear on the meaning of const const int foo int const bar note you actually need to set the pointer here because you.. in the data segment of a program and shouldn't be changed. bar is a const or fixed pointer to a value that can be changed...
What is the difference between a definition and a declaration? http://stackoverflow.com/questions/1410563/what-is-the-difference-between-a-definition-and-a-declaration to that identifier. These are declarations extern int bar extern int g int int double f int double extern can be omitted.. definitions corresponding to the above declarations int bar int g int lhs int rhs return lhs rhs double f int i double d..
Why is “using namespace std;” considered bad practice? http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice called Foo and Bar using namespace foo using namespace bar Everything works fine you can call Blah from Foo and Quux from.. parameters happen to match. If you have used foo Blah and bar Quux then the introduction of foo Quux would have been a non..
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 an expression. #define BAR X f X g X The above version of bar BAR expands the above code into what follows which is syntactically..
What is this weird colon-member syntax in the constructor? http://stackoverflow.com/questions/1711990/what-is-this-weird-colon-member-syntax-in-the-constructor like the following #include iostream class Foo public int bar Foo int num bar num int main void std cout Foo 42 .bar std endl.. #include iostream class Foo public int bar Foo int num bar num int main void std cout Foo 42 .bar std endl return 0 What.. int bar Foo int num bar num int main void std cout Foo 42 .bar std endl return 0 What does this strange bar num mean It somehow..
What is the slicing problem in C++? http://stackoverflow.com/questions/274626/what-is-the-slicing-problem-in-c away. For example class A int foo class B public A int bar So an object of type B has two data members foo and bar Then.. bar So an object of type B has two data members foo and bar Then if you were to write this B b A a b Then the information..
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 argument. For example template typename T struct Foo T bar void doSomething T param do stuff using T somewhere in a .cpp.. which is equivalent to the following struct FooInt int bar void doSomething int param do stuff using int Consequently the..
How to generate a stacktrace when my gcc C++ app crashes http://stackoverflow.com/questions/77005/how-to-generate-a-stacktrace-when-my-gcc-c-app-crashes 1 make a bad pointer printf d n foo causes segfault void bar baz void foo bar int main int argc char argv signal SIGSEGV.. printf d n foo causes segfault void bar baz void foo bar int main int argc char argv signal SIGSEGV handler install our.. SIGSEGV handler install our handler foo this will call foo bar and baz. baz segfaults. Compiling with g rdynamic gets you symbol..
Why is “using namespace std;” considered bad practice? http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice consider this You are using two libraries called Foo and Bar using namespace foo using namespace bar Everything works fine.. works fine you can call Blah from Foo and Quux from Bar without problems. But one day you upgrade to a new version of.. called Quux . Now you've got a conflict Both Foo 2.0 and Bar import Quux into your global namespace. This is going to take..
In C++, what is a virtual base class? http://stackoverflow.com/questions/21558/in-c-what-is-a-virtual-base-class an example class Foo public void DoSomething ... class Bar public virtual Foo public void DoSpecific ... c share improve..
Can we increase the re-usability of this key-oriented access-protection pattern? http://stackoverflow.com/questions/3324898/can-we-increase-the-re-usability-of-this-key-oriented-access-protection-pattern more friends... SomeKey possibly non copyable too class Bar public void protectedMethod SomeKey only friends of SomeKey..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c a couple of other objects void setLog const Foo foo const Bar bar File file path to file File append foo.setLogFile file bar.setLogFile.. file to both foo and bar void setLog const Foo foo const Bar bar File file new File path to file File append foo.setLogFile.. pointers to help us out. void setLog const Foo foo const Bar bar shared_ptr File file new File path to file File append foo.setLogFile..
Is there a way to instantiate objects from a string holding their class name? http://stackoverflow.com/questions/582331/is-there-a-way-to-instantiate-objects-from-a-string-holding-their-class-name variant A B C D ... instead. Like if you have a class Foo Bar and Baz it looks like this typedef boost variant Foo Bar Baz.. Bar and Baz it looks like this typedef boost variant Foo Bar Baz variant_type template typename T variant_type createInstance..
Accessing inherited variable from templated parent class http://stackoverflow.com/questions/605497/accessing-inherited-variable-from-templated-parent-class Foo public Foo a 1 protected int a template class T class Bar public Foo T public Bar b 4 int Perna int u protected int b.. int a template class T class Bar public Foo T public Bar b 4 int Perna int u protected int b template class T int Bar.. b 4 int Perna int u protected int b template class T int Bar T Perna int u int c Foo T a 4 This works return a b u This doesn't..
http://stackoverflow.com/questions/6403055/object-destruction-in-c execution of main Foo get_some_Foo static Foo x return x Bar get_some_Bar static Bar y return y int main get_some_Bar .do_something.. main Foo get_some_Foo static Foo x return x Bar get_some_Bar static Bar y return y int main get_some_Bar .do_something note.. get_some_Foo static Foo x return x Bar get_some_Bar static Bar y return y int main get_some_Bar .do_something note that get_some_Bar..
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 say you had something like your second macro. #define BAR X f x g x Now if you were to use BAR X in an if ... else statement.. second macro. #define BAR X f x g x Now if you were to use BAR X in an if ... else statement where the bodies of the if statement.. in curly brackets you'd get a bad surprise. if corge BAR corge else gralt The above code would expand into if corge f..
Is there a simple script to convert C++ enum to string? http://stackoverflow.com/questions/201593/is-there-a-simple-script-to-convert-c-enum-to-string string Suppose we have some named enums enum MyEnum FOO BAR 0x50 What I googled for is a script any language that scans.. enum_to_string MyEnum t switch t case FOO return FOO case BAR return BAR default return INVALID ENUM The gotcha is really.. MyEnum t switch t case FOO return FOO case BAR return BAR default return INVALID ENUM The gotcha is really with typedefed..
http://stackoverflow.com/questions/4682889/is-floating-point-ever-ok these lines defined in somewhere.h static const double BAR 3.14 code elsewhere.cpp void foo double d if d BAR ... I'm aware.. double BAR 3.14 code elsewhere.cpp void foo double d if d BAR ... I'm aware of the problem with floating points and their.. but when it makes sense and works. UPDATE3 What about foo BAR will this always compare equal as they both use the same do..
rand function returns same values when called within a single function c++ http://stackoverflow.com/questions/6729214/rand-function-returns-same-values-when-called-within-a-single-function-c random string PullOne string pick string choices 3 BAR 7 cherries std srand time 0 pick choices std rand 3 return pick..
What exactly is a type cast in C/C++? http://stackoverflow.com/questions/7558837/what-exactly-is-a-type-cast-in-c-c compiler know or the programmer if I can cast e.g. FOO to BAR c c casting share improve this question A type cast is..
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