Questions tagged [template-classes]
184 questions
3
votes
2 answers
How to use lambda as STL Compare method in a template class?
I'm trying to implement a priority_queue which holds A objects and use a custom Compare method/type. According to the reference example, this is my code:
template
class A{
T value;
A(T _value):value(_value){}
};
template
Emadpres
- 3,466
- 2
- 29
- 44
3
votes
2 answers
Overridden << operator not recognized
I'm trying to override the << operator but it seems that the compiler doesn't recognize my implementation and instead tries to interpret it as a bit shift.
I've already tried to play around with the parameter types (const T&, T&, T, const T) to no…
Anna P.
- 33
- 3
3
votes
1 answer
function as template parameter : if(T receive 2 param)T(a,b); else T(a);
How to make template class Collection receive a function T - that can either has signature T(K) or T(K,int) - as template argument, then conditionally compile base on the signature of the function?
Here is the existing code that can receive 1…
javaLover
- 6,347
- 2
- 22
- 67
3
votes
2 answers
conversion between 2 types with different const qualifiers
This is a short example of the code I want to use:
template
class B
{
public :
bool func1(const T& t)
{
// do something
}
};
class A
{
B b;
public:
void func2(const int* a)
{
b.func1(a);
…
Adam
- 464
- 6
- 16
3
votes
3 answers
Definition of different States of Streams (C++)
I know that ios_base has a declaration of states for streams like
ios_base::goodbit(error state)
ios_base::ate(file open mode state)
and many more.
What I'm interested in knowing is the definition of these member functions of ios_base
Are they a…
Fiju
- 416
- 1
- 5
- 11
3
votes
1 answer
C++ Errors trying to overload the / operator in a templated class
I'm trying to overload the '+', '-', and '/' operators for a templated class i created.
the + and - operators work perfectly, but the / operator overload is giving me errors.
I'm using Visual Studio 2013
//Set.h
#pragma once
#include…
uktuk
- 33
- 2
3
votes
2 answers
Disable a function by throwing error at compile-time with template class using traits
I have a class, let's call it Foo with several methods:
template
class Foo {
public:
Foo() { /* ... */ }
bool do_something() { /* ... */ }
// This method should be callable only if:
//…
Maxime Lorant
- 34,607
- 19
- 87
- 97
3
votes
3 answers
Template class and possible performance issues
If I use a template class to create 30 different definitions. My question is that will it compile into 30 actual classes in binary (binary size = sizeof(template_class) x 30), although their actual code are very similar or even exactly the same ? …
Bryan Fok
- 3,277
- 2
- 31
- 59
3
votes
3 answers
Making this template class into a generic class
So I am a college student just looking for a little help and understanding, I have a professor that does not allow us to use java pre-written classes such as ArrayList, so I am trying to figure out how to modify my current encapsulated array class…
user1789066
- 31
- 1
2
votes
1 answer
Member method calls virtual method with same name but different signature
I have the following Header/Source files:
// foo.h
#ifndef __FOO_H
#define __FOO_H
#include
flonk
- 3,726
- 3
- 24
- 37
2
votes
1 answer
syntax for starting a thread in a template class
I create an object of type T in a template class.
template
class worker
{
public:
worker() { obj = new T(app_cfg);}
~worker() { if (obj) { delete obj; obj = nullptr; }}
void start();
private:
T * obj = nullptr;
…
pipetka
- 43
- 3
2
votes
1 answer
Class Template non-type member access in sub-class
I have a Matrix class template which looks like this:
using matrix_size_t = unsigned int;
using matrix_data_t = double;
template
class Matrix
{
protected:
matrix_data_t m_matrix[row][col];
//more code…
Abhishek A Udupa
- 401
- 6
- 13
2
votes
3 answers
How can I handle circular #include calls in a template class header?
Related to Error "Unterminated conditional directive" in cross-referencing headers
I have a Serializable template class:
serializable.h
#pragma once
#ifndef SERIALIZABLE_H
#define SERIALIZABLE_H
#include "Logger.h"
#include
#include…
Kevin Rak
- 336
- 2
- 14
2
votes
4 answers
Simplify large number of template specializations
So I have a tremendous number of template specializations of this template:
template // Same
struct foo { // Same
using type_name = T; // Same
foo(const int base) : _base(base) {} // May take other parameters
void func(const…
Jonathan Mee
- 37,899
- 23
- 129
- 288
2
votes
1 answer
How to avoid include files spreading due to template classes
Due to the implementation of a template class in a header file, I have to include the other includes used in the implementation of the class in the header file.
Because of that, each time I include my template class that bring all other the…
Moia
- 2,216
- 1
- 12
- 34