General C++ Programming - April 2024

Why does s have the value false? template<typename T> char test_have_range(decltype(&T::begin), decltype(&T::end)); template<typename T> short test_hav...

[1 reply] : #ifndef DUTHOMHAS_IS_ITERABLE_HPP #define DUTHOMHAS_IS_ITERABLE_HPP ... (by Duthomhas)

by JUANDENT

How to test if a type T has a begin<T> defined

I have a SFINAE context where I have the following: struct have_sort { char c; }; struct have_range { char c ; }; struct have_none { char c ; }; ...

[no replies]

by JUANDENT

why testing for member pointer determines the template type is a class?

why does this code determine if the type is a class: template<typename T> class is_class { template<typename C> static char test(int C::*); template<typena...

[4 replies] Last: Thanks!! (by JUANDENT)

by lostwithcpp

Trouble with seeing where variable is initialized?

Hello, This question is in regards to the initialization of the variable value_type value; I can see that the struct foo is typed as the wrapper<int> b...

[4 replies] Last: [quote=lostwithcpp]this is only for structs, not classes? Technically... (by Peter87)

by Cplusc

C1090 error (1,2)

I am getting the following annoying and frustrating error which appeared suddenly out of nowhere. the code was working just fine and I don't know what happened....

[23 replies] Last: hardware that old wouldn't be able to slot enough ram to run it either... (by jonnin)

by PacR

Read nested structures from file.

Hi guyz im having trouble reading structures from text file containing: // this is example.txt structname1{ hp 50 mp 10 structname2{ ...

[19 replies] Last: As another take on this, consider: #include <iostream> #include <fs... (by seeplus)

by lostwithcpp

How to find the Type of a struct that is passed as an argument and the template arguments for a lambda function?

The question I have pertains to the type of the structs that are passed as a function argument into this function template<class Arg> Result operator()(A...

[5 replies] Last: thanks for all the help (by lostwithcpp)

by cn00by

"large" project, crashes, variable "overlap", gdb

hello, i searching for days for an Segmentation fault. What i ve done: i try: - valgrind - gdb - comment the most c++ code out my problem, if i comme...

[1 reply] : The code that you have posted does not contain any header files. If t... (by Peter87)

by JUANDENT

how can I generalize a structure using templates?

Hi, This is something I don't want to write for each table in a database and am sure templates would be excellent for this kind of work.. but how? struct Pa...

[5 replies] Last: used templates! (by JUANDENT)

by JUANDENT

What is the difference between module partitions and submodules?

I have a module called math that export imports two submodules like this: export module math; export import math.one; export import math.two; I also ha...

[4 replies] Last: I haven’t touched modules yet. I'm working through some of the bas... (by George PlusPlus)

by JUANDENT

cannot access OnEvent(Button&, int)!

class EmptyType {}; template < class TList, template <class AtomicType, class Base> class Unit, class Root = EmptyType > class Gen...

[2 replies] Last: thanks!! (by JUANDENT)

by Cplusc

Applying Boundary Condition

Firstly, I'd like to extend my apologies to anyone viewing this question, as it may not strictly pertain to programming. However, I'm posting it here in the hop...

[3 replies] Last: @Cplusc Ok, no worries. Have you made any progress using a debugger? (by TheIdeasMan)

by JUANDENT

A problem with GenLinearHierarchy from Alexandrescu's design

Hi, I am studying Andrei Alexandrescu's Modern C++ Design book and cannot access the OnEvent(Button&, int) implementation of: using linear = Loki::GenL...

[no replies]

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