I was wondering if it was possible to access data from an array inside a threaded function after it has finished executing?
Take this example:
Code:
#include <iostream>
#include <boost/thread.hpp>
using namespace std;
[Code]....
After workerFunc has finished, how could I access the array arr? Is there any way to get (3,4,5,6,7) back into main()?
I have built Boost from the website using
./bootstrap.sh
./b2 install
I think all are installed properly. I am trying to use Xcode to include the library of boost:thread.My code links to the header file properly with " #include "boost/thread.hpp"" commented, as seen from the following:
However, it could not link properly to boost-thread if "#include "boost/thread.hpp"" is un-commented.
Error page is shown as:
I have linked the dynamic library libboost_thread.a and libboost_thread.dylib and included /usr/local/include into header search path and /usr/local/lib into library search path.
I have a class which I wrote and one of its object is "SerialPort" .NET class. In my MainWindow I created instance of my class called "SerialPortComm", then I send through some functions of mine, commands to the Serial Port, and I receive answers through "DataReceived" event.
But when I trying to use Dispatcher.BeginInvoke to write my data I have received (successfully), nothing shows on the RichTextBox which I'm trying to write to.
What can caused that, and How I can make it works?
SerialPortComm.cs
public partial class SerialPortComm : UserControl {
public SerialPort mySerialPort = new SerialPort();
public void Open_Port(string comNumber, int baudRate) {
mySerialPort.PortName = comNumber;
mySerialPort.BaudRate = baudRate;
[Code] ....
I wanna create mesh Array using boost elements, that will be do the same that code below, but can accept numbers of double. Any boost array that give me needed functionality. It will be great that advised element has the same argument list. I mean
// [base,stride,bound)
// [0,2,4)
Or may be there are any opportunity modify this boost::multi_array_types::index_range in order do make it accept double...
1>------ Build started: Project: HP_A.1_d_, Configuration: Debug Win32 ------
1> Main.cpp
1>c:all myс++ha level 9solutionlevel 9hp_a.1_d_main.cpp(15): warning C4244: 'argument' : conversion from 'double' to '__w64 int', possible loss of data
1>c:all myс++ha level 9solutionlevel 9hp_a.1_d_main.cpp(15): warning C4244: 'argument' : conversion from 'double' to '__w64 int', possible loss of data
1>c:all myс++ha level 9solutionlevel 9hp_a.1_d_main.cpp(18): warning C4244: 'argument' : conversion from 'double' to 'unsigned int', possible loss of data
1>c:all myс++ha level 9solutionlevel 9hp_a.1_d_main.cpp(20): warning C4244: 'argument' : conversion from 'double' to 'unsigned int', possible loss of data
1>c:all myс++ha level 9solutionlevel 9hp_a.1_d_main.cpp(20): warning C4244: 'argument' : conversion from 'double' to 'unsigned int', possible loss of data
1> HP_A.1_d_.vcxproj -> C:all myс++HA level 9SolutionLevel 9DebugHP_A.1_d_.exe
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
Code:
#include <boostmulti_array.hpp>
#include <iostream>
typedef boost::multi_array_types::index_range range;
[Code]....
I want to access the elements of my array dynamically. So far I've only figured out how to do this manually. if I tried it like this my code would work but there should be a better way right?
View 10 Replies View RelatedWrite a program that reads in the names and the ages of ten people. Store these data in two arrays (make sure that the entered names are not longer than the array size you choose). Then produce a table of ten lines, with each line giving the name and age of a person along with the (positive or negative) deviation of that person's age from the average age. The code I wrote to fill in the arrays looks as follows
Code:
#include<stdlib.h>
#include<stdio.h>
int main()
{ // begin main()
// array length
[Code]....
When I compile it, it gives me warnings that few of the variables I declared aren't used, but that is not affecting the program at all. When I run the program, it allows me to pass the names and ages into the arrays, but when it comes to displaying them, I'm getting a 'Segmentation fault'. I used very similar code in Java to write the program, and it worked fine so what is the problem with C then?
I am trying to retrieve the elements in an array to print them. I am pretty sure I have everything right, but it is not working. There are 5 values in the array {3, 4, 10, 5, 6}, but the first two elements (supposed to be 3,4) are coming out a 0,-2654238590. The last three elements are coming out correct.
void addDynArr(DynArr *v, TYPE val) {
/* FIXME: You will write this function */
assert(v != 0);
//resize if necessary
if(v->size >= v->capacity)
[Code] ....
I've been working for some number of days on this code to take information about movies from both a file and the user, store the infos in an array of structs, and at the end, write all the info out to a file. I'm having some problems with an error message reading:
"prog.c:102:11: error: subscripted value is neither array nor pointer nor vector"
this error occurs in many lines (which I will label specifically below -- they are everywhere where I am trying to access/modify an individual element of a struct element of the array).
A few examples of where I am having the problems are lines:
39, 52-55, 70, 72, and 86 (and more of the same exact variety).
I am obviously rather systematically doing something wrong, but I am quite certain all of these are the exact same mistakes.
I pull up also 2 or 3 other errors, but I don't think they are related and should be able to fix them quickly once I work out this conundrum.
#include <string.h>
#include<stdlib.h>
#include <stdio.h>
int moviecount =0;
typedef struct{
int year;
[Code] .....
Code:
int arr[10];
int* p = arr;
int (*p2)[10] = &arr;
So, pointer p is a pointer to an array, I can use it to access elements of arr as in *(p+5).
Pointer p2 is a pointer to an array of ten integers. What is it for, how can I use it to access elements of arr?
I am writing a C program to access a string into an array from a pointer array in Visual Studio 2010. Program is given below:-
Code:
#include <stdio.h>
#include <string.h>
void main() {
char data_a[6],data_b[6]="ABcde",*ptr;
ptr=&data_b[0];
data_a[0]=*ptr;
printf("%s",a);
}
I am getting some junk character first and then my actual data on console window. I want to where I am getting wrong and how to resolve it.
I'm okay with 2-dimensional arrays, but when I get to 3 or more, I can't seem to wrap my head around how to assign and/or pull values from specific parts.
To give an example, let's take the following example:
We know that a player can take up to 5 total quests, and each quest can have a max of 5 tasks.
Let's assume I have the following multi-dimensional array holding all of a players quest data:
quests[0] = 78;// Store the questID
quests[0][0] = 3945;// Store the 1st creature ID
quests[0][1] = 2230;// Store the 2nd creature ID
quests[0][2] = 3045;// Store the 3rd creature ID
quests[0][0][0] = 2;// Store how many needed of the 1st creature
quests[0][1][0] = 5;// Store how many needed of the 2nd creature
quests[0][2][0] = 13;// Store how many needed of the 3rd creature
As we know, the above code can't be done. How do I assign certain values to each specific dimension?
I have a contiguous sequence of section headers in a file (all the data in the file is stored in void * data), where each section header is the same size and has the same fields in the same order. So it's laid out like an array.
I have to:
- Use an offset value and the number of section headers variables to identify the location and length of the section header table (these are hdr.offset and hdr.length respectively).
- The offset value shows the distance between the start of the file and the start of the first section header (so I need a pointer to the start of the first section header)
- Apply a typecast to location of the section header table to process it as an array of section headers.
Here is what I have done, but I am getting a segmentation fault. What am I doing wrong? How do I fix this?
typedef struct {
unsigned int name;
unsigned int type;
} SectionHeader;
[Code] ....
I wrote a program to run long simulations, in one cpu core computation. During the run, I checked the cpu occupation was always around 85%.
Since my simulation took time to run. How can I boost it up to make my cpu run at 100%? Is that because my RAM is not fast enough?
info about my laptop: cpu frequency: up to 3.2 GHz. RAM frequency: 1333 MHz.
I have in my main(), a function that creates my arg object using boost/program_options.hpp i want to pass this object to another function using templates like this:
Code:
template <typename Targ>
void Count(Targ & arg){
MyObj<string> QueryTab(arg["input-file"].as<string>()); //line number is 352
...
}
However I get an error:
Code:
../include/Filter.hpp: In member function ‘void Count(Targ&)’:
../include/Filter.hpp:352:40: error: expected primary-expression before ‘>’ token
../include/Filter.hpp:352:42: error: expected primary-expression before ‘)’ token
... obviously it does not recognize my intention, what did I do wrong?
I have an issue getting boost libraries to work with QT IDE. Here are relevant lines from my .pro file...
INCLUDEPATH += c:/users/bob/desktop/boost_1_53_0/
LIBS += -LC:c:/users/bob/desktop/boost_1_53_0/stage/lib64
After adding #include <boost/filesystem.hpp> I get error...
C:UsersobDesktopqtpuntitled5mainwindow.cpp:3: error: C1083: Cannot open include file: 'boost/filesystem.hpp': No such file or directory
The IDE does not highlight the line. The error only appears on compilation.
I have one problem deleting a file with boost. The file is opened in another application and cannot be deleted. I am supposed to received an exception error but I don't get it.
Here is my piece of code, very simple:
bool delete_file(const string &path) {
boost::filesystem::path bpath(path);
try {
if (boost::filesystem::remove(bath)) return true;
[Code] ....
I have put a breakpoint inside the catch part but it does not come to this point. Instead, the the output window of visual studio, I got these lines:
First-chance exception at 0x00007FFD2E575A88 in site_server.exe: Microsoft C++ exception: boost::filesystem::filesystem_error at memory location 0x00000070F8E3E920.
Unhandled exception at at 0x00007FFD2E575A88 in site_server.exe: Microsoft C++ exception: boost::filesystem::filesystem_error at memory location 0x00000070F8E3E920.
How to manage this situation?
exportmain.cpp
Code:
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
// Create an empty property tree object
using boost::property_tree::ptree;
#include "kwxport.h"
#include "resource.h"
[Code] ....
How can I make boost:roperty_tree:tree get recognized by the compiler?
i have written an algorithm in VC++ 2010 express edition. i have used the following header files
#include<iostream>
#include<string>
#include<sstream>
#include<ctime>
#include<cassert>
#include<fstream>
#include<vector>
[Code]...
the algorithm worked fine in vc 2010 express edition....
the following header files are not working in vc5
#include<regex>
#include<tuple>
#include<numeric>
#include<unordered_set>
#include "clip.h"
Looks like some of hte boost libraries have to added with vc5.. If any one knows how to add boost libraries with vc5.
showing lot of errors in vc5... not able to run the algorithm in vc5. Our company has only vc5.... the algorithm has to be implemented in vc 2010....
[URL] ....
I wonder how tag reading can be achieved? If say I have a file like
<name>
<firstname>John</firstname>
<surname>Robinson</surname>
</name>
I'd like to read "firstname" or "surname" instead of John or Robinson ....
So I need to use boost/regex for regular expressions. someone told me that it needs to be built. the first problem is boost doesn't tell you how to build it and the second is i did sudo apt-get install libboost something. I don't remember the exact name of the package. it installed but i dont know how i would build it when its installed.
View 2 Replies View RelatedI have been using a Boost NonCopyable library in Microsoft Visual Studio 2013.
What I have is the following error message:
Error1error C2280: 'boost::noncopyable_::noncopyable::noncopyable(const boost::noncopyable_::noncopyable &)' : attempting to reference a deleted functionc:usersjohndocumentsvisual studio 2013projectsdonttreaddonttreaddonttread.cpp181DontTread
Now what I want to rectify the error is to throw an exception, so that the program can compile smoothly.
I have written a program that uses boost in visual studio 2012. The only boost library I used is filesystem by doing.
1)Properties->Linker->General and adding the path or the .lib to the additional dependencies. The libraries, link at compile time.However when i move the exe to a different computer, it doesn't work. Therefore the libraries were dynamically not statically linked. So my question is how do I statically link the filesystem library, so that i can include boost/filesystem.hpp in visual studio 2012?
i've created dll and implemented shared memory that every connected process can use. My problem is that i can't change anything in object, which is stored in the memory.
my class :
class MyClass
{
public:
MyClass();
void test();
int counter;
};
void MyClass::test() {
MessageBoxA(NULL, "test", "test", 0x0000000L);
counter++;
}
in stdafx.h i have :
static offset_ptr<MyClass> offset_mt;
static managed_shared_memory *memSegment;
I initialize shared memory and pointer :
memSegment = new managed_shared_memory(create_only, SHARED_MEMORY_NAME, 4096);
offset_mt = memSegment->construct<MyClass>("MyClass myClass")();
And then in an exported function i call
offset_mt.get()->test();
Im calling this from Java using JNA and result is a memory error (Invalid memory access). However, if I delete 'counter++' from test method, everything works fine - message box appears. Is there a limitation that I cant modify objects inside mapped memory or is this done the other way?
I am using boost matrix for generating matrices used for filters. I wan to assign a pointer to these matrices so i can call them out of the function. but i am not able to understand where i am failing. the example code is here.
int main(int argc, char *argv[]) {
QApplication a(argc, argv);
identity_matrix<double> M(3);
std::cout<<M<<std::endl;
[Code] ....
I have the following code which is based of the tut3.cpp example at: [URL] ....
However, I'm not entirely sure how to retrieve the full file path which I'd like to use to get the file size. So essentially the aim is to go through a directory and list all the file sizes.
Code:
if (exists(p)) {
if (is_directory(p)) {
cout << p << " is a directory containing:
";
copy(directory_iterator(p), directory_iterator(), // directory_iterator::value_type
[Code] ....
I have been working with and trying to understand Boost for random number generating. I've come to understand that what I want is now in the C++11 standard, but I've stuck with Boost.
What I have done is create a simple main.cpp that generated random numbers successfully. From there I wanted to create a more optimal system by separating out the random code portion to a class that can be instantiated and called on demand. My problem now is that when I call the random routine of the class I just get one number no matter how many times it's called.
I know that rapid seeding is an issue so I put the seed function of the random portion in the class's constructer so that it is only called once on the creation of a class. I also tried making it a static member, but I haven't had success with that yet either. For now though, I would simply like to get successive random values upon calling the class's random function.
class header Code: #ifndef roomGen_hpp_
#define roomGen_hpp_
#include"boost/random.hpp"
#include"main.hpp"
class
roomGen
{
private:
boost::mt19937rngDimensions;
[code].....
The main.hpp file only contains a couple of struct definitions. In main I call the class with Code: randomRooms.push_back(randRooms.createRoom()); to get back a struct with random values and push it into a vector.
I'm unsure what I'm doing wrong here to only get back a single non random number from successive calls. I have tried moving the variable creation lines from roomGen::createRoom() to the private area of the class definition, but that causes me to get a slew of undefined errors so I had to settle on putting those declarations inside the function.