Warning C4596 can, apparently, be solicited by several configuration. I found a few that did not match my problem so this is submited:
class dialog_base : public wxFrame
{
public:
dialog_base::dialog_base( const wxString& title );
… }
1> E:\WX\wx_numbers_01\dialog_base.h(18,28): warning C4596: '{ctor}': illegal qualified name in member declaration (compiling source file wx_numbers.cpp)
So how should this constructor be declared?
Just in case, as I read the error it comes from this part of the declaration:
dialog_base::dialog_base
I realize removing the "unexpected qualification" will resolve this warning. In your case, just use
dialog_base( const wxString& title );
May I know the reason why one would want to use
dialog_base::dialog_base( const wxString& title );
Related
Probably a dumb question (WinRT noob), but, here is goes...
The code from "App.xaml.h" is:
namespace winrt::Precog::implementation
{
struct App : AppT<App>
{
App();
void OnLaunched(Microsoft::UI::Xaml::LaunchActivatedEventArgs const&);
private:
std::wstring cfgDatabase = L"";
winrt::Microsoft::UI::Xaml::Window window{ nullptr };
IAsyncAction loadSettings();
};
}
When I try to compile, Visual Studio gives me a C3646 (unknown override specifier) at the IAsyncAction declaration?
The loadSettings implementation is:
IAsyncAction App::loadSettings()
{
PHKEY regKey = NULL;
LSTATUS regResult;
regResult = RegCreateKey(HKEY_CURRENT_USER, L"Precog", regKey);
if (regResult != ERROR_SUCCESS)
{
ContentDialog errorDialog = ContentDialog();
errorDialog.Title(box_value(L"Erro"));
errorDialog.Content(box_value(L"Pateta"));
errorDialog.CloseButtonText(L"Ok");
errorDialog.XamlRoot(window.Content().XamlRoot());
auto result = co_await errorDialog.ShowAsync();
}
else
{
co_return;
}
}
EDIT: Full compiler output:
Build started...
1>------ Build started: Project: Precog, Configuration: Debug x64 ------
1>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2304,5): warning MSB3106: Assembly strong name "C:\Code\Precog\packages\Microsoft.WindowsAppSDK.1.0.0\build\native\..\..\lib\uap10.0\Microsoft.Windows.System.winmd" is either a path which could not be found or it is a full assembly name which is badly formed. If it is a full assembly name it may contain characters that need to be escaped with backslash(\). Those characters are Equals(=), Comma(,), Quote("), Apostrophe('), Backslash(\).
1>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2304,5): warning MSB3106: Assembly strong name "C:\Code\Precog\packages\Microsoft.WindowsAppSDK.1.0.0\build\native\..\..\lib\uap10.0\Microsoft.Windows.PushNotifications.winmd" is either a path which could not be found or it is a full assembly name which is badly formed. If it is a full assembly name it may contain characters that need to be escaped with backslash(\). Those characters are Equals(=), Comma(,), Quote("), Apostrophe('), Backslash(\).
1>App.xaml.cpp
1>C:\Code\Precog\Precog\Precog\App.xaml.h(17,22): error C3646: 'loadSettings': unknown override specifier
1>C:\Code\Precog\Precog\Precog\App.xaml.h(17,34): error C2059: syntax error: '('
1>C:\Code\Precog\Precog\Precog\App.xaml.h(17,36): error C2238: unexpected token(s) preceding ';'
1>C:\Code\Precog\Precog\Precog\App.xaml.cpp(35,19): error C2039: 'loadSettings': is not a member of 'winrt::Precog::implementation::App'
1>C:\Code\Precog\Precog\Precog\App.xaml.h(7): message : see declaration of 'winrt::Precog::implementation::App'
1>C:\Code\Precog\Precog\Precog\App.xaml.cpp(48,30): error C2065: 'window': undeclared identifier
1>Done building project "Precog.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Got it. It seemed to be a namespace mismatch, since changing the declaration to:
winrt::Windows::Foundation::IAsyncAction loadSettings();
Solved the problem. The interesting bit is that Intellisense does not catch the error (no red line underneath the type), only the compiler does.
I try to create a singleton object using shared_ptrs. However the code does not compile when the constructors/destructor are private for the specific object
The code is below.h
//ThreadPool.h
class ThreadPool
{
public:
static std::shared_ptr<ThreadPool> & getInstance();
inline static std::shared_ptr<ThreadPool> m_threadPoolInstance;
private:
ThreadPool() =default;
~ ThreadPool() = default;
ThreadPool(ThreadPool const &) = default;
};
//ThreadPool.cpp
#include "pch.h"
#include <ThreadPool.h>
std::shared_ptr<ThreadPool> & ThreadPool::getInstance()
{
if (! m_threadPoolInstance)
{
ThreadPool * p_ThreadPool = new ThreadPool();
m_threadPoolInstance.reset(p_ThreadPool);
}
return m_threadPoolInstance;
}
I am using VS17 compiler
The error that is created is the following
error C2440: '': cannot convert from '_Ux *' to
'std::shared_ptr'
with
[
_Ux=ThreadPool
] include\memory(1462): note: No constructor could take the source type, or constructor overload resolution was ambiguous
threadpool.cpp(9): note: see reference to function template
instantiation 'void std::shared_ptr::reset(_Ux
*)' being compiled
with
[
_Ux=ThreadPool
] threadpool.cpp(9): note: see reference to function template instantiation 'void std::shared_ptr::reset(_Ux
*)' being compiled
with
[
_Ux=ThreadPool
]
When I set the constructors/destructor in public section, the compilation is succesfull.
However running the same code using gcc compiler , compiles succesfully
The conversion fails because your ThreadPool class has a private destructor.
Calling .reset(ptr) will use the delete expression (delete ptr;) as the deleter, which requires that the destructor be public.
Refer to overload (2) here: https://en.cppreference.com/w/cpp/memory/shared_ptr/reset
2-4) Replaces the managed object with an object pointed to by ptr. Y must be a complete type and implicitly convertible to T. Additionally:
2) Uses the delete expression as the deleter. A valid delete expression must be available, i.e. delete ptr must be well formed, have well-defined behavior and not throw any exceptions. Equivalent to shared_ptr(ptr).swap(*this);.
You either need to make the destructor public or provide a custom deleter.
I'm trying to define Callbackdefinitions to make it easier to work with many callbacks in my Node.js project.
My database.ts file looks like that:
export default class Database {
//Export the enums
public static LoadObjectResponse = LoadObjectResponse;
//Export Callback definitions
public static loadObjectCallback: (resultCode: Database.LoadObjectResponse) => void;//ERROR
...
}
enum LoadObjectResponse {
ERROR_ON_LOADING, //"Error on Loading Object.",
OBJECT_NOT_FOUND //"Object not found."
}
So I want a loadObjectCallback defined, that says that the parameter has to be of the enum Type LoadObjectResponse. But when I try to do it like that, the compiler always gives the error
Cannot find namespace "Database"
I don't understand why it gives me the error, the variable itself is in the definition of Database, why doesn't it work?
It gives me the same error when I try to use it in Classfunction definitions:
public static loadObject(MongoModel, searchObject, callback: Database.LoadObjectResponse) {//ERROR namespace Database not found
Again Error:
Cannot find namespace "Database"
Inside of functions in the Database class calling
Database.LoadObjectResponse
works flawlessly, why doesn't it work in variable definitions?
Cannot find namespace "Database"
This is a common learning curve issue. You need to understand and be comfortable with the intutive concept of declaration spaces : https://basarat.gitbook.io/typescript/project/declarationspaces
Things are distinct in the type declaration space or in the variable declaration space.
In your case public static LoadObjectResponse is a variable hence cannot be used as a type (error on annotation usage : Database.LoadObjectResponse).
Fix
Please don't treat a class as a namespace. The file is a module.
export class Database {
//Export Callback definitions
public static loadObjectCallback: (resultCode: LoadObjectResponse) => void;//ERROR
}
export enum LoadObjectResponse {
ERROR_ON_LOADING, //"Error on Loading Object.",
OBJECT_NOT_FOUND //"Object not found."
}
Also beware of export default : https://basarat.gitbook.io/typescript/main-1/defaultisbad
It's because Database.LoadObjectResponse is a property and not a type. You can't use properties as types.
To make this work, change it to use the type of the property:
static loadObjectCallback: (resultCode: typeof Database.LoadObjectResponse) => void;
Or refer directly to the enum type of LoadObjectResponse:
static loadObjectCallback: (resultCode: LoadObjectResponse) => void
``I am learning how to loadImage in cinder.
I used loadImage function defined in ImageIo.h file,
but When I build my code it gives the following error
c:\users\user\particle\src\particleapp.cpp(30): error C2440: 'initializing' : cannot convert from 'ParticleApp *' to 'cinder::app::AppBasic *'
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
How to resolve it ?
Trying to guess without seeing your code.
But have you added the parent class type to your ParticleApp class?
Where you declare
class ParticleApp { ... }
you should do:
class ParticleApp : public cinder::app::AppBasic { ... }
I've been using Crypto++ with VS2005 and VS2010 for a while now. But recently I needed to use it with and application directly. The same code compiles fine when I'm compiling as a DLL and does not compile when compiling as an application.
This is the smallest sample that reproduces the error is this (based on cryptopp561\algparam.h:301 CryptoPP::AlgorithmParametersTemplate
class Base
{
protected:
virtual void MoveInto(void *p) const = 0;
};
template<class T>
class Test: public Base
{
public:
void MoveInto(void * buffer) const
{
Test<T> *x = new(buffer) Test<T>(*this);
}
};
extern template class Test<bool>;
The compilation parameters are the same, only difference that I saw was the configuration type in the project ("Application (.exe)" generates the error and "Dynamic Library (.dll)" does not).
This is the compiler error:
main.h(15): error C2061: syntax error : identifier 'buffer'
main.h(14) : while compiling class template member function 'void Test<T>::MoveInto(void *) const'
with
[
T=bool
]
main.h(20) : see reference to class template instantiation 'Test<T>' being compiled
with
[
T=bool
]
It seems to occur only when theres inheritance. Ommiting : public Base in the class Test declaration makes the error go away.
EDIT:
The problem was in a header included somewhere that defined a a debug version for operator new but didn't declared the placement new version.
Did you #include <new>, the header file that declares placement-new?
Funnily, extern templates are to tell the compiler to not instantiante at some point, so the second error does not make sense to me. Are you certain your compiler has support for extern templates? What if you do the opposite, explicit instantiation:
template class Test<bool>;