Hello! I'm having some issues with producing an int matrix without creating memory leaks. I want to be able to make a given (global) matrix into any size dynamically via read_matrix(). But then i want to be able to free the memory later on. So in my main method the second printf should result in a bus error since it should not have any ...
I know how to create an array of structs but with a predefined size. However is there a way to create a dynamic array of structs such that the array could get bigger? For example: typedef struct { char *str; } words; main() { words x[100]; // I do not want to use this, I want to dynamic increase the...
What are the ways to reduce the amount of memory my applications take in RAM?..Because even 30kb application loads ~20Mb of "unneeded" dlls.Am i mistaking when i think that any .NET app takes at least 10Mb in working set of memory when we need a form with text in it? Couldn't find any explanation of this :( PS question is closed. But i...
What are the differences between the following constructs? Why prefer one over the other? Dim byteArray(20) as Byte and Dim byteArray() as Byte = new Byte(20) {} Edit - Corrected the ReDim. Should be a Dim. ...
Hello, I have a C++ memory management doubt, that's (obviously) related to references and pointers. Suppose I have a class Class with a method my_method: OtherClass& Class::my_method( ... ) { OtherClass* other_object = new OtherClass( ... ); return *other_object; } Meanwhile in a nearby piece of code: { Class m( ... ); ...
What is the difference between System.GetMem and System.ReallocMem? Delphi 2009 Help for ReallocMem, is exactly the same description of GetMem. How about System.FreeMem and System.Dispose What should I use with arrays? type PMemberDataList = ^TMemberDataList; TMemberDataList = array[0..MaxClassMembers -1] of PMemberData; var F...
how allocate memory dynamically for the array of stucture.... eg: class students { struct stud { int r_no; char name[20]; }*s; } how to allocate memory dynamically for *s... ...
Last week I wrote a few lines of code in C# to fire up a large text file (300,000 lines) into a Dictionary. It took ten minutes to write and it executed in less than a second. Now I'm converting that piece of code into C++ (because I need it in an old C++ COM object). I've spent two days on it this far. :-( Although the productivity di...
Hi, I have a question about the std::vector. I have a very memory intensive algorithm where I forsee that predicting vector sizes and reserving enough memory for the vectors in advance will help me a lot with reducing memory usage. Which of the following is better: for ( ... ) { std::vector<Type> my_vector; my_vector.reserve(stuff...
I would like to pass some (dll or not) function pointers as arguments to some dll functions and call them from inside of the dll. I wonder if it is safe because I have found an information on http://publib.boulder.ibm.com/infocenter/zos/v1r10/index.jsp?topic=/com.ibm.zos.r10.cbcpx01/fpref.htm that: In DLL code, it is assumed that a func...
After four weeks of learning Objective-C for the iPhone, my first useful application is almost finished. However, I still need to save several instance variables whenever the current view is changed and to reload them when the view is reopened. I have no trouble loading variables with basic C types like int and BOOL, but am having diffi...
Hello, I have a very basic question and need help. I am trying to understand what is the scope of a dynamically allocated memory (on heap). #include <stdio.h> #include <malloc.h> //-----Struct def------- struct node { int x; int y; }; //------GLOBAL DATA------ //-----FUNC DEFINITION---- void funct(){ t->x = 5; //**can I...
#define IMGX 8192 #define IMGY 8192 int red_freq[256]; char img[IMGY][IMGX][3]; main(){ int i, j; long long total; long long redness; for (i = 0; i < 256; i++) red_freq[i] = 0; for (i = 0; i < IMGY; i++) for (j = 0; j < IMGX; j++) red_freq[img[i][j][0]] += 1; total = 0; for (i = 0; i < 256; i++) to...
I am compiling a C program with the SPARC RTEMS C compiler. Using the Xlinker -M option, I am able to get a large memory map with a lot of things I don't recognize. I have also tried using the RCC nm utility, which returns a slightly more readable symbol table. I assume that the location given by this utility for, say, printf, is the l...
What does lazy allocation of objects mean and how is it useful? ...
I have a C++ program that benchmarks various algorithms on input arrays of different length. It looks more or less like this: # (1) for k in range(4..20): # (2) input = generate 2**k random points for variant in variants: benchmark the following call run variant on input array # (3) Is it possible to reset the whole he...
I am developping on Windows with DevStudio, in C/C++ unmanaged. I want to allocate some memory on the stack instead of the heap because I don't want to have to deal with releasing that memory manually (I know about smart pointers and all those things. I have a very specific case of memory allocation I need to deal with), similar to the ...
Is there a way to define a macro (or something similar) that would allow objects to be allocated on the stack or on the heap, cleanly? eg. Current code: A a; a.someFunc(); The simplest suggestion might be the following, but as you can see below, it's not very clean to maintain 2 sets of code. #ifdef USE_STACK A a; a.someFunc();...
I'm trying to store a pointer in an array. My pointer to a pointer is class object is: classType **ClassObject; So i know i can allocate it by using the new operator like this: ClassObject = new *classType[ 100 ] = {}; I'm reading a text file, with punctuation and here is what i have so far: // included libraries // main function...
What tools are available to attribute memory consumptions in VB6 application to it's multiple components? I can get the memory consumed by the entire application by watching various counters (Private Bytes, Working Set etc.), for example, in Process Explorer. I want to go level deeper than that and understand how much memory is consumed ...