Questions tagged [templates]
The templates tag is used in multiple contexts: generic programming (especially C++), and data/document generation using template engines, web template for a pre-designed webpage, or set of HTML webpages. When using this tag on implementation heavy questions - tag the code language the implementation is written in.
templates
55,314
questions
0
votes
1
answer
54
views
Unexpected 'pointer is null' warning in boost asio library?
I'm compiling a project that incorporates the asio C++ library, and I'm getting a pesky warning:
../opendnp3/_deps/asio-src/asio/include/asio/impl/connect.hpp:75:73:
warning: ‘this’ pointer is null [-...
- 669
-1
votes
0
answers
36
views
How to write C++ template SFINAE in my case [duplicate]
template<typename VertexType>
class CQuad
{
public:
VertexType tl, bl, tr, br;
void SetColor(const CColor& color)
{
//if VertexType has a member "color", then
...
- 1
-1
votes
0
answers
59
views
FSM with templates and pointers [duplicate]
Hi I'm trying to make a FSM Finite State Machine in c++ with pointers and templates. I want to simplify my code and get access to the variable of the State controller inheritted or the Game Screen ...
- 9
5
votes
1
answer
88
views
Weird behaviour with 'if constexpr' and templates in MSVC
The code below behaves incorrectly.
When f<0> or f<5> is called, it prints as if k = true, but the if statement behaves as if k = false. When f<1> is called, it does the opposite.
...
1
vote
2
answers
54
views
Return the correct type when the template passed into a function argument changes type
NOTE: Please do NOT suggest I implement overloaded functions! I know how to do that. The point of this exercise is to learn how to work with templates.
I have this function (it takes some params and ...
- 13
0
votes
1
answer
32
views
Making a tuple of references out of another tuple by condition
I have a templated structure ContainerInner that has a tuple with vectors of types from its variadic template and a structure Container that contains a tuple of ContainerInner, specified in its ...
- 71
-1
votes
0
answers
29
views
C++ calling function template of template parameter, error "invalid operands of types" [duplicate]
#include <iostream>
using namespace std;
struct X
{
template<bool S>
void foo()
{
cout << "foo, S:" << S << endl;
}
};
template<...
- 1,541
-1
votes
2
answers
17
views
TemplateDoesNotExist by inheriting LoginView
django cannot find my template but I give it correct path
I make customize view for login by inheriting LoginView and form_class of AuthenticationForm from django. I give correct template_name to view ...
4
votes
1
answer
99
views
correct syntax to access a template variable specialization
assume a template variable in data.h:
template <class T>
struct Data
{
Data() = delete;
Data(T initValue) : value(initValue){}
T value;
};
template<class T>
extern Data<T&...
- 758
-2
votes
0
answers
26
views
C++: define function template in class template, but outside the class body [duplicate]
#include <iostream>
using namespace std;
template<class T>
struct Handler
{
template<bool local>
void foo()
{
cout << "foo" << endl;
}
...
- 1,541
-2
votes
2
answers
70
views
Add a templated attribute to a class? [closed]
I want to define a class like,
template<int N> class A{
public:
template<int D> B<D>* InstanceofB;
void methodofClassA(input){
methodofClassB(input);
}
...
0
votes
0
answers
22
views
getting errors with django templates [duplicate]
I am practicing Django lately and i get this error, can someone assist
Invalid block tag on line 17: 'else', expected 'endblock'. Did you forget to register or load this tag?
The template
{% extends '...
0
votes
3
answers
88
views
nested switch statements for template arguments
We have some templated function that takes 2 compile-time arguments, e.g.
template<int a, int b>
void SomeFunc(double *x, double *y, double *z);
For performance reasons, it is better to have ...
- 27
2
votes
1
answer
66
views
Member pointer template parameter pointing into the object being templated
I would like to have a base class that I derive from that offers serialization mechanism:
template <typename Type, typename Class, Type Class::* Member>
class Serializable
{
public:
void ...
- 11.3k
-3
votes
1
answer
93
views
Getting error when trying to overload << operator in C++
I am trying to print a vector for logging purposes in C++. I have made a function but it's throwing an error. Can anyone please help me explain why and suggest a possible fix. Here's the code snippet
#...
