C++ :: Can't Throw Exception In Template

Feb 24, 2013

I'm making an "improved" array for my programing class. It's currently unfinished, so you might see some commented out code. I'm trying to debug what I have.

I keep getting these errors when I try to complile my main.cpp:

In file included from main.cpp:3:0:

array.h:107:43: error: expected type-specifier before ‘out_of_range’
array.h:107:43: error: expected ‘)’ before ‘out_of_range’
array.h:107:43: error: expected initializer before ‘out_of_range’
array.h:121:55: error: expected type-specifier before ‘out_of_range’
array.h:121:55: error: expected ‘)’ before ‘out_of_range’
array.h:121:55: error: expected initializer before ‘out_of_range’

My main file:

#include <iostream>
#include <stdexcept>
#include "array.h"
using namespace std;
using namespace ArrayNameSpace;
int main()
{
Array<int> testSubject(5);
return 0;
}//End main

aannnd my Array.h file:

//ADD CONSTS TO METHODS
//CURRENTLY WORKING ON EXCEPTIONS AND BRACKET[] OVERLOADS. I HAVE TO FIGURE OUT SOLUTIONS FOR REACHING
//INDEXES FOR CHARS AND ENUMS
#ifndef __array_H__
#define __array_H__
#include <stdexcept>
namespace ArrayNameSpace
{

[code]....

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Feb 3, 2015

i made a ActiveX Library with C++ Builder XE3 for use in VB6

i want to throw a error like the dao360.dll do (VB6 stop on the correct line) not just show a messagebox

i try to many different "throw" (EOleException, EOleSysError, ..) but it always crash VB6

if i use SetErrorInfo or this->Error(), nothing happen

i cannot return a HRESULT my fonction return a Database* (the name of my CoClass)

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May 3, 2013

I have this code I wrote with some data and what I'm supposed to do is insert exception handling into the code. The problem is I've seen the basic examples of it. But I don't know how to implement it into my code.

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
int main(){
string filename, n;
cout << "To find a file, type in the file name. " <<endl;

[Code] .....

And the file is:
A
F
D
E
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B
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C :: Sort The Array Values Then Throw Out First And Last Value

May 1, 2014

This program is suppose to sort the array values then throw out the first and last value. It does not seem to do doing this.

Code:
# include <stdio.h>02
void bubbleSort(float judges[], float array);
03
int main (void){

[code] .....

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C++ ::  how To Declare Template Function Inside Template Class

Dec 5, 2013

I'm trying to implement a simple template array class, but when i came into the operator< i actually have to use a template :

my code is something like :

template<typename _Type, std::size_t _Size>
class array {
public :

[Code] ......

but i am having an error of shadows template param 'class _Type' is it w/ the name conflict between the array template parameter and the function template parameter ?

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C++ :: Use Of Class Template Requires Template Argument List

Nov 6, 2013

Error1error C2955: 'DoubleLinkedListInterface' : use of class template requires template argument listdoublelinkedlist.h10
Error2error C2244: 'DoubleLinkedList<T>::DoubleLinkedList' : unable to match function definition to an existing declaration doublelinkedlist.cpp7

Error3 .cpperror C2244: 'DoubleLinkedList<T>::~DoubleLinkedList' : unable to match function definition to an existing declaration 12

.h

#pragma once
#include "DoubleLinkedListInterface.h"
#include "Node.h"
#include <iostream>

[Code]....

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C++ :: Partial Template Specialization With Template Class

May 27, 2013

I have a generic template class with another template in one of its types. Now I want to specialize one of its methods for a particular (template) class, which leads to a compile error, however.

Here is the example:

#include <stdio.h>
template<typename Type>
class Obj1 {
public:
void ID() { printf("Object 1, size = %zu

[Code] .....

GCC ends with:
:35:27: error: type/value mismatch at argument 2 in template parameter list for ‘template<class Type, template<class> class O> class Foo’
:35:27: error: expected a class template, got ‘Obj2<Type>’

What is wrong with the specialization? Can it even be achieved and how (if so)?

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C++ :: Template With A Specialized Template Class Parameter?

Nov 2, 2014

how I want the code to look. Only problem is it doesn't work (Line 11). I have some experience with templates but I'm not a pro.

Basically I want the "Channels<3>" to be a type that I can use to specify a Cable with similar to vector<float/int> it would be Cable<Channels<2 or 3>>.

What have I messed up with the syntax?

#include <iostream>
#include <vector>
using namespace std;

[Code].....

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Mar 14, 2014

I have a function:

template<class Iterator, class T>
void a(Iterator, Iterator, const T&);

and I want to be able to simplify calls to 'a' with calls like

a(someIteratableContainer);

instead of having to call:

a(someIteratableContainer.begin(), someIteratableContainer.end(), valueOfTheContainersElementType);

I also want to be able to generalize the function to handle any of the standard iteratable contains: array, vector, deque, whatever.

I was under the impression I could write:

template<template<class T> class U> a(U<T>& container) {
a(container.begin(), container.end(), g(T()));
}

where 'g()' returns an object of the element type. However, the compiler is claiming, no matter how I write a call to the overload, the original template is selected and/or the overload is invalid, depending on the various ways I attempt to write said overload.

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C++ :: Use External Template With Template Specialization?

Nov 17, 2013

[URL]

#include <iostream>
struct Outer {
template<typename T>
void go() {
std::cout << Test<T>::f() << std::endl;

[Code] .....

I have tried several variants on this code to no avail. Outer is in a header, along with the extern template statements, and the specializations after main are in their own cpp file. Main is in a different cpp file.

What do have to do to make this work? I cannot bring the definitions of f() into the header, and they will be different for different template parameters. Ideally, I want Test to remain a private member of Outer, though this can change if it's the only option.

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C++ :: Passing Same Template Value To Two Different Template Functions

Dec 11, 2014

I have been trying to get a hang on templates. I have the two following functions that that could be consolidated in a single template function:

void Attractor::updateFamilies(FamiliesController *_tmp, int _counter){

center.x = ofGetWidth()/2;
center.y = ofGetHeight()/3;
attractorCounter = _counter;
if(attractorCounter == 1){

[Code] .....

NotesController and FamiliesController have the same parent. The thing that I'm trying to grasp with templates is that is could something like:

template<class TYPE>
void Attractor::updateData(TYPE* *_tmp, int _counter){
center.x = ofGetWidth()/2;
center.y = ofGetHeight()/3;
attractorCounter = _counter;

[Code] ....

And then have another template function declaration for all the attractor functions where I pass the same template value as in the first one.

As you can see, I'm calling another functions inside called attractors(_tmp). I know that one way around it could be to get rid of that function and just do all the logic inside of each if statement. Is there any way to pass the same template function parameter within a template function parameter?

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Feb 9, 2015

I have a class like this

PHP Code:
template<class X>
class A {
  X m_x;
public:
    X* foo();
    X* bar();
    //others are not related to X
}; 

I would like to get rid of

PHP Code: template<class X> 

For class level but still use it for members. Like this

PHP Code:
class A {
  X m_x;
public:
    template<class X>
    X* foo();
    template<class X>
    X* bar();
    //others are not related to X
}; 

However, I am still stuck at

PHP Code: X m_x; 

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C++ :: Declare Template Type Object Inside Template Type Class Definition

Oct 12, 2013

Let me put it into the code snippet:

/**
This class build the singleton design pattern.
Here you have full control over construction and deconstruction of the object.
*/
template<class T>
class Singleton

[Code]....

I am getting error at the assertion points when i call to the class as follows:

osgOpenCL::Context *cxt = osgOpenCL::Singleton<osgOpenCL::Context>::getPtr();

I tried commenting assertion statements and then the debugger just exits at the point where getPtr() is called.

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Jan 30, 2014

My perceptron's train function seems to materialize my BadInput exception object out of nowhere. Yet, everything works fine.

And when I put an forever loop in main to validate the output with many different inputs, I get a bad_alloc exception and a call to terminate().

BadInput.hpp

Code:
#ifndef BADINPUT_HPP
#define BADINPUT_HPP
class BadInput {
public:
BadInput(int val):difference(val) {

[Code] ....

I cannot figure out why train() is throwing an exception...feedforward didn't, as it's error message never printed.

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Feb 14, 2013

I catch an exception and want to log it on the console. This works as exepcted, but Valgrind shows me a set of invalid reads.

Here the code of the catch-block:

} catch(HGL::IOException &e) {
logError(e);
}

The signature of the logDebug is: BasicLogger &operator<<(const std::exception &e);

Now valgrind shows me 4 errors like that:

==20943== Invalid read of size 1
==20943== at 0x402C658: strlen (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==20943== by 0x41554DD: std::basic_ostream<wchar_t, std::char_traits<wchar_t> >& std::operator<< <wchar_t, std::char_traits<wchar_t> >(std::basic_ostream<wchar_t, std::char_traits<wchar_t> >&, char const*) (in /usr/lib/i386-linux-gnu/libstdc++.so.6.0.16)

[Code] .....

Generally I dislike invalid read in my code, even if they are harmless like in that case.

If I don't pass a reference, but a copy of the exception, I don't get this invalid reads, but also loose all information, because of the implicit upcasting.

Why I get the illegal read, resp. why std::wstring is deleting it on the way to the <<-operator?

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Oct 25, 2014

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Class X
{
public:
X();
//Pre-condition: example can't be 3.
void number(int example);

[code]......

If I know that the exception can only happen at the beginning of the function, is it okay to catch it right away?

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Jul 18, 2014

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vector<float> operator+(const vector<float>& a, const vector<float>& b){
unsigned long size;
vector<float> temp;
if(a.size() >= b.size())
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[Code] .....

and then I would do something like this in the main:

vector<float> v, v1, v2;

v1.push_back(9.1);
...
v2.push_back(8);
...
v = v1 + v2;

but when I try to output the vector v I just get a vector out of range exception.

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Sep 21, 2013

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I don't know what is the exactly problem. So I just copy everything and paste here. Please don't fear of these codes, I have 2 files only, but I will paste 3 files here, the one is prototypes.h, then the main.cpp, the last one is part of my function that can working well alone, but when I put them into main.cpp I will get the error message like I mentioned before.

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int main(){
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If a class A contains an array of objects of another class B.. And in the constructor of A, while constructing objects of B, any one object throws an exception, then how can we guarantee to release all the memory acquired.. so that there is no memory leak..

class B{};
class A{
public:
  B Array[100];
  ...
};  

In the above code, if in constructor of A, suppose 99 objects of B are constructed successfully, but 100th object throws exception, then how can we guarantee to release all the memory acquired by the other 99 objects?

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bool delete_file(const string &path) {
boost::filesystem::path bpath(path);
try {
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[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.
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This my code below.

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Jun 9, 2012

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How should I change the code below .

Code:
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Code:
void operator >> (istream &is, clsDate &date) {
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