C / C++ Forum

Hi all, I am facing a weired problem when I try using maps. Here is the sample code. Can anyone please tell me where am I going wrong. int main() { less<int> ltvar; std::map<int, int> m2(less<int>()); m2; // compilation fails at this point return 0;

Say I have a class template: template <typename T> class myclass { public: template <typename U> myclass(void ) {

In following code char str = "asdf" ; str = 's' ; is possible. But char *str = "asdf" ; str = 's' ; is an run-time error. What i understand is *str = "asdf" is stored in Read-only-Memory. Where

in VC++ Express Edi Is their a way to replace one line of TEXT in an existing text file. I now open it then read in the data, once I have found somthing that needs updating, I need to overwrite that one line only and continue reading the rest of the file to check for other line that may need updates.

I'm compiling a huge(900 files ) embedded application written in C . Over a period of time , the code has developed a lot of inter crossed dependenc. The current scenario is , i make a change to one header file , it begins to compile all the .c files in the project. Is there a tool/algorithm to remove all the unecessary dependency ? How do...

This code, compiled with visual studio .NET 2003, double a = 95.022, b = 0.01; printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a - floor(a / b) * b); a = 95.021, b = 0.01; printf ("%lf - floor(%lf / %lf) * %lf = %.17lf\n", a, a, b, b, a - floor(a / b) * b); a = 95.020, b = 0.01; printf ("%lf - floor(%lf / %lf) * %lf =...

Hi, Perhaps a stupid question but I wonder if this isn't possible using C: printf("\nOr push <enter> for default (which is theta=%ld)%s", theta, ": "); It would be nicer to have it on one line... (I know this works): printf("\nOr push <enter> for default (which is theta=%ld)", theta);

What is a good and cheap way to get C++ (and OpenGL) development on Windows-XP?

Greetings, I have a C++ problem. I am implementing a signal handler inside a class SignalClass. The code looks as follows: SignalClass is an Singleton class. class SignalClass { private: int assign(int sig); void handler (int sig);

I am trying to cast an ostream reference to void* and back again. The code below shows the problem isolated from a more complex program. It compiles quietly but seg faults upon execution. // =================================================================== #include <iostream> using namespace std; void myprint(void *s) { (ostream&)s...

According to the docs... http://www.cppreference.com/cpplist/sort.html There is a parameter to the std::list.sort method. I don't understand this methods use... I want to sort the list which is a list of points x,y,z. I have three points involved in the sort... The two points the sort algorithm is providing for comparison and a refrence...

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Does that just not compile with vc++? I found this in "template complete" and asked myself if this is just a nice feature of some compilers, or if it is standard? I can't install other compilers! ########### #include <iostream> template <typename T> inline

Hi all, I've been designing a program which would need to have a function to replace values in a string. For example I could have a string: "<circle x="%" y="%">" and then I would replace the % with actual values. But I cannot think of a way to convert an integer(say 5643) to a NULL terminated string. I'm thinking of writing a function...

I had a look at this book: "C Primer Plus, Fifth Edition Stephen Prata " and I found simply fantastic. My english is little but I had no problem to understand it. Was wondering if you suggest to get a copy of it or if there is something of better than it.

Hi, first hello, I am new to the list, and I guess my question will show that clearly. I want to use some vector operations (at the moment altivec) in existing code. It is a raytracing-based application, and for now, I would like to replace the operations on my data type vect3 (which is a float array) by operations on a vector float. The...

symbol 'FunctionFromA' referenced in file 'File_B.DOJ' could not be resolved I include the header with the missing function. What's more strange that another file containing exactly the same function calls and include files and being in the same directory compiled well. Any ideas guys ?

I am writing a program and have been instructeed to use the 'fseek', 'ftell', and 'stat' functions, however, after looking in the online manual for each of these, I am still unsure on how to use them. In my program, I am to write a code that opens a file, uses 'stat' to determine the file size, use 'fseek' to move the offset of the pointer,...

I am using a map that takes an string as the key and a structure that is being stored. struct StateType { int i; float f; char* s; }

I need some help with the following C/C++ question. It is fairly straight forward but I'm having some difficulties. Thanks for your help. You are given the following function signature: void addParen(char* str) Write code for the function body that will enclose every

I am looking for a source code for solving linear programming using simplex method. if any one of you have any code related to it in C,C++ or JAVA then please send it to me immediately.

hi all, i'm trying to use a classes enums in another class, but can't seem to find the right syntax. i've got class A which has: enum EditTypeA {Currency, Percent, LabeledNumber, Text}; EditTypeA LineType; // LineType holds widget type, and will be either Currency, Percent, LabeledNumber or Text

Suppose we wish to find the median of a collection of values. Assume that we have read some of the values so far, and that we have no idea how many values remain to be read. Prove that we cannot afford to discard any of the values that we have read. Hint: One proof strategy is to assume that we can discard a value, and then find values for the...

Hi, I have the following code which uses STL transform algorithm. It basically takes a list of Rect* object, get all the y attribute and store it in a vector of 'int'. My question is: is there a way to simplify the code? Is there a way for me to get rid of the GetY class, since it essentially just calls 'getY()'. Thank you.

Hi, int main(void) { char ch='a'; printf("%s",ch); return 0; } Why does this give segmentation fault?