I have this piece of code from the book "Modern C++ Design" that checks for compile-time error. When i tried to compile it, i get the error "invalid application of size of to function type". How to make this compiler-time checker work?
Code:
template<bool> struct CompileTimeChecker{
CompileTimeChecker(...);
};
template<> struct CompileTimeChecker<false> {};
[Code] .....
After looking online for a string replace function in C and finding so many examples that go through the entire string twice. First round to find how number of occurances of substitute in string, using that to malloc for a new string to include additional space for replace, then going through the search string again to get all but what's to be substituted out. I feel it's kind of silly to go through the string twice. Therefore, I'm trying to implement my own string replace, that only searches through the string for what's to be substituted, once.
Here is my code:
Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
char *strreplace(char * string, char * sub, char * replace);
}
[code]....
Here is the same code, but with execution + some syntax highlighting: Ideone.com | Online C Compiler & Debugging Tool..It works great, until it gets to grabbing whatever remains in the search string after the last found sub. The realloc throws a runtime error:
Code:
*** glibc detected *** ./a.out: realloc(): invalid next size: 0x00011008 ***
Aborted From my understanding, this is from me going outside of the bounds of the heap and using memory I haven't allocated, or using a free'd pointer. I'm not seeing where either of these are happening in my code, and was wondering what the best way to go about figuring out where the error exactly occurs.
I want to implement an existent compiler to my Visual C# application.The compiler should run code written in C#,Java,C++ and Lua. How do I do that?
View 7 Replies View RelatedThe error is : invalid initialization of reference of type 'ArrayT<float>&' from expression of type 'const Arrat<float>'...The above errors occur when I tried to do the following code , with operator* overloading :
const ArrayT<float>& b1 = A*A;
ArrayT<float>& c2 = b1*A;// <---- this line makes the error
//b1 is a const ref of ArrayT<float>
//A is just a normal object of ArrayT<float> created by ArrayT<float> A(blah,blah,blah);
The following are the list of operator* overloading :
template <class T>
ArrayT<T>& ArrayT<T>::operator*(ArrayT<T>& b) {blah,blah,blah}
template <class T>
const ArrayT<T>& ArrayT<T>::operator*(ArrayT<T>& b) const
[code]....
I want to use for error multiplication above, but not success.
I am trying to write a program that will take a list of integers from a file and write them to another text file. I've been banging my head at this for days trying to get it to compile as it is riddled with linker and compiler errors.
**************************header*************************
#ifndef LINKEDLIST_H
#define LINKEDLIST_H
#include <iostream>
using namespace std;
template <class T>
class linkedList {
[Code] ....
struct st
{
char a;
short b;
char c;
}
what will be size of structue.
I am trying to use the Singleton design patterno on Linux, but it is not working:
in the .h I have:
Code:
public:
static ErrorH& Instance();
private:
ErrorH() {};
In the .cpp I have:
Code:
ErrorH& ErrorH::Instance() {
static ErrorH& self = ErrorH();
return self;
}
The errors I get are:
Code:
g++ --g -c ErrorH.cpp -o ErrorH.o
ErrorH.cpp: In static member function "static ErrorH& ErrorH::Instance()":
ErrorH.cpp:9: error: invalid initialization of non-const reference of type "ErrorH&" from a temporary of type "ErrorH"
make: *** [ErrorH.o] Error 1
This code works on Windows, how can I get it to work on Linux?
Do I have to use T as a parameter type in order for the compiler to deduce it?
For example this:
template<typename T> T max(T x[], const int& len) {
T maximum(x[0]);
for(int i = 1; i < len; i++)
if(maximum < x[i])
maximum = x[i];
return maximum;
}
If I take out the T as type of x[] it will not compile because it can't deduce T right?
Like so
template<typename T> T max(long x[], const int& len) {
T maximum(x[0]);
for(int i = 1; i < len; i++)
if(maximum < x[i])
maximum = x[i];
return maximum;
}
I tried and it wouldn't compile but I just wanna make sure that it is necessary that I always have to use my template parameter as a parameter type in order for my compiler to deduce the type?
I am trying to read a file line by line and then do something with the informations, so my method looks like this:
Code:
void open_file(char *link) {
FILE *file = fopen(link, "r");
if (file == NULL) {
fprintf(stderr, "Could not open file.
");
exit(EXIT_FAILURE);
[Code] ....
1) The first complain of valgrind is at the line where I use fgets and its telling me (invalid write of size x), but I have allocated my line to 56000 and the read line is shorter, why is there a write size error then :S?
2) at the line where I realloc where I try to shrink the space he's telling me: Address .... is 0 bytes inside a block of size 56000, But I know i need only this space so why is there a write over space error :S??
I want to develop a interactive and animated real-time offline map application. For example if user puts mouse on the map, it should the latitude, longitude and name of the location.
There should be animation for example blinking of a location. And it should work offline without internet. I want to use google maps data but I don't know how.
I know following languages:
C/C++ (Advanced level)
PHP (intermediate level)
Java ( beginner level)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security;
using System.Security.Principal;
using System.Text;
using System.Threading;
namespace WindowsPrincipalTrial {
public class Program
[Code] ....
I was assigned a project to implement a real time graph to an application which continuously outputs data numerically through the GUI. The application that was created to do this is written in C.
I have to turn those numerical numbers into a graphical display that is periodically updated to appear as real time.
My adviser suggested using NTgraph [URL] ...... I had no clue how to implement this to my code and was finally able to understand that the .OCX needs to be registered as a COM and then imported to the application using visual studios. However, I get an error when I try importing it since it is in C (Visual Studios 8) and not an MFC application.
So my question is if it would be possible to implement the ActiveX control to my application even though it is not an MFC application and how to go about it.
How do I set the size of a member array via the class constructor if I know the size at compile time. I can do this with templates, see below, but this leads to code bloats, I think.
So one class declaration but objects with different array sizes.
Can't use constexpr.
Can't use STL.
Can't use new.
#include <iostream>
using namespace std;
template<int T>
class MyArray {
private:
int array[T];
public:
int getSize()
[Code] ....
I have an application that reads a process and return values from it. The problem it works fine with small processes but i have some processes that are about 1GB or even 2GB and when i try to read such big processes the application crashes. I'm trying to find a way to read the process memory in chunks of maximum 10 MB. The read code looks like:
Code:
HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, entry.th32ProcessID);
unsigned char *p = NULL;
MEMORY_BASIC_INFORMATION info;
for (p = NULL; VirtualQueryEx(hProcess, p, &info, sizeof(info)) == sizeof(info); p += info.RegionSize)
[Code] ....
This reads the info.regionsize which can be as large as 100 MB. Is there any way to read it in chunks ?
I want to find the size of the data type with out using sizeof() operator.
View 9 Replies View Relatedactually it is the windows application .When i'm running my program it is not allowing me to enter the data into textboxes means the cursor is not appearing
View 1 Replies View RelatedI made a program and when I try to use the main driver to instantiate everything it says invalid storage class for a function. All of my code is in 4 separate files i'm just trying to get it to run now.
Code:
#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <fstream>
[Code]......
I have a program which call only one time malloc at the start of the program. When running, I see with 'process-explorer.exe' that memory is growing in little steps. Is this normal? why?
Using Windows 7
Im just wondering how would i get a formula to calculate the total size and proportion of how far the media player has been played, in proportion with the size of the sizeable form, i need an int for the:
Width of formLength of movieHow long has been played by user
I have this code so far:
//The current position played! - Within the timer.tick event arg!
string splayed = axWindowsMediaPlayer1.Ctlcontrols.currentPosition.ToString().Split('.')[0];
int iplayed = Convert.ToInt32(splayed + 1);
//The total time of the movie/audio.
string stotal = axWindowsMediaPlayer1.Ctlcontrols.currentItem.duration.ToString().Split('.')[0];
int itotal = Convert.ToInt32(splayed);
[Code] ....
I have the "AxWindowsMediaPlayer" reference installed, but i need to know how it would work...
Attached image(s)
I am trying to create a flexible interface for my CL application. And what i have is this :
Code:
using namespace std;
// iplcp -i queryFile -d databaseFile
template <typename INT, typename CHARA>
class API {
vector<string> files;
vector<INT> flags;
[Code] ....
and in main :
int main(int argc, char **argv){
//set variables
API<int, char**>args(argc,argv);
cout << "In file: "<< args.GetOpt("i") << " Db file: " << args.GetOpt("h") << endl;
}
// first thing to be printed should be string and the second int
I know this is not probably the best way to but i am laying around and was curious if something like this could work . Are there any good C++ templates for CLI applications from which i could learn?
I'm a little lost with this program. The idea is to dynamically allocate an array and increase its size every time a new integer is inputted by the user. I believe it is a memory leak but as we have just started learning this I'm not sure how to recognise it. Sometimes I can input as many integers as I want other times 2 or 3 before it crashes. When I can input enough values i exit the loop and send it to the sort function and mean calculator function, all works fine there except the last number inputted becomes this huge value not hexadecimal though... As such I'm at a loss as what to look at next, so here you go:
#include <iostream>
using namespace std;
void SelectSort(int [], int);
float MeanCalc(int [], int);
float MedianCalc(int* [], int);
[Code] .....
Here's what I'm trying to do : A simple readout that shows the input/feedback values for 10 different sensors (i.e. a motor, a thermocouple, light sensor, etc).
What I got so far:
The data is stored in 2 different arrays:
One array is a 2D string array that stores descriptions, and won't be changed:
Sensor ID, Sensor Type, Input Signal, Feedback Signal
["A"]["Motor"]["PWM Signal"]["RPM"]
["B"]["Thermocouple"]["N/A"]["TempC"]
etc
The second array is another 2D int array that stores all the data values:
Input Signal, Feedback Signal
[0][0] // for Sensor A, Input is 0 PWM, 0 RPM read from sensor
[0][25] // for Sensor B, Input is 0, 25C read from sensor
etc
My question: I'd like to re-write the code to incorporate the new things I learned in c++. Right now, the descriptions for all 10 sensors are in 1 array and the sensor values are in another array. If I use pointers to access the values, is there a performance difference between:
1. Keeping it as is, with 2 2d arrays
2. 1 big structure that has descriptions and sensor values for all 10 sensors (i.e. combining everything into 1)
3. 1 parent class, and 10 different objects for each sensor (i.e. splitting into 10)
I'm making a flash card type console application using visual studios 2013. The flash cards contain character that I can display using unicode. So far I am looking at about 200 characters across 2 unicode blocks which I don't want to hard code into my arrays. I thought of initializing my arrays using a loop. The only problem is I don't know how to add in hexadecimal. So is there a way to initialize my array without having to input 200 values my self? Also is hexadecimal addition possible without me having to write a function for it?
View 3 Replies View Relatedi want to modify value of whole array by passing it to a function and make each value of array multiplied by 3 ,return the value to main and print it using pointer.
error : invalid Lvalue is the error
Code:
#include<stdio.h>
main()
{
int i,arr[10];
for (i=0;i<=9;i++)
{
printf("Enter value of arr[%d] : ",i);
scanf("%d",&arr[i]);
[Code] ....
I have to write a code which would determine either a URL address is correct or not.
Now, a valid address should look like: "www.something.something.uk".
It has to have 3 dots, 3 w-s in the beginning, and it must end with "uk".
E.g.
Valid addresses:
1. www.jce.ac.uk
2. www.tr2213.oi34.uk
Invalid addresses:
1. www2.jce.ac.uk
2. òæøéàìé - îëììä à÷ãîéú ìäðãñä éøåùìéí - ìéîåãé äðãñä ìúåàø øàùåï
3. www.something.uk
Just to be clear, this criteria mentioned above is not real, just homework
Code:
#include <iostream>
#include <string.h>
using namespace std;
int isValid (char s[])
{
int dots=0;
[Code] ......
It tells me both strings are incorrect but the first 1 is.
I have to make a 8-puzzle and I got the algorithm i just dont know how to restart the program every time i type the move of the blank place in the 3x3 puzzle so i dont have to make 10000 lines to solve the puzzle
View 2 Replies View Related