tdesktop/Telegram/SourceFiles/data/data_abstract_structure.h at dev · dmitry/tdesktop · GitHub

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This file is part of Telegram Desktop,

the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:

https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL

#pragma once

namespace Data {

// This module suggests a way to hold global data structures, that are

// created on demand and deleted at the end of the app launch.

// Usage:

// class MyData : public Data::AbstractStruct { .. data .. };

// Data::GlobalStructurePointer<MyData> myData;

// .. somewhere when needed ..

// myData.createIfNull();

class AbstractStructure {

public:

virtual ~AbstractStructure() = 0;

};

inline AbstractStructure::~AbstractStructure() = default;

namespace internal {

void registerAbstractStructure(AbstractStructure **p);

} // namespace

// Must be created in global scope!

// Structure is derived from AbstractStructure.

template <typename Structure>

class GlobalStructurePointer {

public:

GlobalStructurePointer() = default;

GlobalStructurePointer(const GlobalStructurePointer<Structure> &other) = delete;

GlobalStructurePointer &operator=(const GlobalStructurePointer<Structure> &other) = delete;

void createIfNull() {

if (!_p) {

_p = new Structure();

internal::registerAbstractStructure(&_p);

}

Structure *operator->() {

Assert(_p != nullptr);

return static_cast<Structure*>(_p);

}

const Structure *operator->() const {

Assert(_p != nullptr);

return static_cast<const Structure*>(_p);

}

explicit operator bool() const {

return _p != nullptr;

}

private:

AbstractStructure *_p;

};

// This method should be called at the end of the app launch.

// It will destroy all data structures created by Data::GlobalStructurePointer.

void clearGlobalStructures();

} // namespace Data

tdesktop/Telegram/SourceFiles/data/data_abstract_structure.h at dev · dmitry/tdesktop · GitHub

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