What is Operator overloading? Is operator overloading a specific feature to C++ and not available in Java
Please explain in detail with examples. Thank you ...
c++
What does this mean: "error: invalid combination of multiple type-specifiers"
I'm getting a compiler error on FreeBSD: error: invalid combination of multiple type-specifiers From the C++ Code: typedef unsigned off_t uoff_t; Not sure what the gcc compiler is trying to tell me. ...
how to overload == operator to allow it to be used in multiple comparisons ?
Hi, I am trying to overload == operator to compare objects like below. class A { int a; public: A(int x) { a = x; } bool operator==(const A& obRight) { if(a == obRight.a) { return true; } return false; } }; int main() { A ob(10), ob2(10), ob3(10); if(ob == ob2) // ...
Check Input in Visual C++ using C commands.
I want to use the following code just to check the input. #include <stdio.h> #include <iostream> #include <ctype.h> int main() { int number1; puts("Enter number 1 please:"); scanf_s("%d",&number1); if (isdigit(number1)) { puts("Input is correct."); } else { puts("Your input is not c...
Windows C++ Pipe Creates Big Black Terminal Window
Hello, I'm trying to pipe io through a terminal application as per microsoft's documentation (http://msdn.microsoft.com/en-us/library/ms682499(VS.85).aspx). The problem is, when I add this code, it pops up a big black empty box / terminal / console window. I don't want it to do that. Suggestions? Thanks! ...
Objective C member in C++ class
Hi. Is it possible to have a objective c member in a c++ class @interface ObjectiveCClass : UIViewController { int someVarialbe; } - (void)someFunction; @end class CPlusPlusClass{ ObjectiveCClass obj; // have a objective c member void doSomething(){ obj.someFunction; // and call a objec...
How do I invoke the nothrow version of delete?
I have the following code, which doesn't compile: int *p = new(nothrow) int; delete (nothrow) p; //Error The error I get is: error C2440: 'delete' : cannot convert from 'const std::nothrow_t' to 'void*' Does a nothrow version of delete exist? If so, how can I invoke it? In C++: The Complete Reference, it's given that it exis...
What is the closest thing to Pex for Visual C++?
Pex automagically generates unit tests for C# code. Is there anything similar (free or commercial) for C++ code? ...
Get the results from a 2D array??
Possible Duplicate: for-loop to compare the two-dimensional array???Help!! Im using a code to show these symbols (X, O, A). These symbols will appear in 9 fields randomly. For example see this figure: My problem is: I don't know how to get the results. Because the slot machine game that I am developing is based on: If the ...
How to cover all possible data types when declaring a function parameter in C++
I'm attempting to construct a function that will perform a sanity check on the user's response to a number of questions, each of which would ideally be a non-zero integer. How can I construct a function that would be able to accept a parameter of any data type, but only have a single parameter? For example: bool SanityCheck(<type id> nu...
Non-member static templated method definitions in C++?
Can I call a non-member static templated function from a static member function where the definition is split into header and cpp: // zero.cpp class Zero { static void zero() { one(5); } }; // one.h template <typename T> static void one(T& var); // one.cpp template <typename T> void one(T& var) { } // main.cpp ... Zero::zero...
C++ catch with multiple parameters
First I found in cplusplus.com the following quote: The catch format is similar to a regular function that always has at least one parameter. But I tried this: try { int kk3,k4; kk3=3; k4=2; throw (kk3,"hello"); } catch (int param) { cout << "int exception"<<param<<endl; } catch (int param,string s) { ...
Stack unwinding in C++ when using Lua.
I recently stumbled into this this C++/Lua error int function_for_lua( lua_State* L ) { std::string s("Trouble coming!"); /* ... */ return luaL_error(L,"something went wrong"); } The error is that luaL_error use longjmp, so the stack is never unwound and s is never destructed, leaking memory. There are a few more Lua API's th...
How do I convert this OpenGL makefile from Linux to Mac OS X?
I'm trying to compile a OpenGL program on my MacBook and can't figure out how to convert this makefile. CFLAGS= -I/usr/X11R6/include -I/usr/local/include LDFLAGS= -L/usr/X11R6/lib -L/usr/local/lib -lGL -lGLU -lm -lglut BINARIES=q2 all: $(BINARIES) clean: -rm *.o $(BINARIES) q2 : q2.o g++ $(LDFLAGS) $^ -o q2 q2.o: q2.cpp g+...
What does this mean: "warning: comparison between 'enum A<B>' and 'enum A<B>'"?
I added following at line 42 of proto.h: typedef boost::make_unsigned<off_t>::type uoff_t; And now I get this verbose and confusing warning from gcc complaining about comparing an enum to the same enum type: In file included from proto.cpp:12: /usr/local/include/boost/type_traits/is_unsigned.hpp: In instantiation of 'boost::detail::i...
Simplest way to show a clock in C++ and Linux.
I'm using C++ under Linux compiling with standard GCC. In my program I want to add a simple clock showing HH:MM:SS. What's the easiest way to do that? ...
STRLEN printf on two lines?
Hi, Can someone explain the following occurrence to me? unsigned int i; i = strlen("testData"); printf("%d\n", i); Output: 8 5 Why is it printing the extra 5? [Update:] After reading the comment, I stupidly realized where the 5 was coming from, sorry! ...
In C++, initialize a class member with 'this' pointer during construction.
Hi everyone. I'd like to create a class that is associated to another class in some sort of parent-child relationship. For this the "child" class needs a reference to it's parent. For example: template <typename T> class TEvent { private: T* Owner; public: TEvent(T* parent) : Owner(parent) {} }; class Foo { private: TEven...
what is different between char* t=new char and char* t=new char[10];
Possible Duplicate: What's the difference between new char[10] and new char(10) what is different between char* t1=new char and char* t2=new char[10]; both allocate memory and t1[100]='m' and t2[100]='m' is correct for them -----------after edit: but why we can use t1[100] if t1 is dynamically allocated char not ar...
Character encoding problem
Greetings, I'm developing a project in C++ where I want to use characters like á é õ and ┌ ─ ┐ │ to draw a couple of nice frames. My doubt resides in what I should change in my code/project settings since, without any kind of modifications, the console just prints pseudo-random characters. I know that the above characters are defined ...