/usr/include/mircommon/mir/module_deleter.h is in libmircommon-dev 0.26.3+16.04.20170605-0ubuntu1.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /*
* Copyright © 2015 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Andreas Pokorny <andreas.pokorny@canonical.com>
*/
#ifndef MIR_MODULE_DELETER_H_
#define MIR_MODULE_DELETER_H_
#include <memory>
namespace mir
{
class SharedLibrary;
namespace detail
{
class RefCountedLibrary
{
public:
RefCountedLibrary(void* address);
RefCountedLibrary(RefCountedLibrary const&);
~RefCountedLibrary();
RefCountedLibrary& operator=(RefCountedLibrary const&);
private:
std::shared_ptr<mir::SharedLibrary> internal_state;
};
}
template<typename T>
struct ModuleDeleter : std::default_delete<T>
{
ModuleDeleter() : library(nullptr) {}
template<typename U>
ModuleDeleter(ModuleDeleter<U> const& other)
: std::default_delete<T>{other},
library{other.get_library()}
{
}
detail::RefCountedLibrary get_library() const
{
return library;
}
protected:
ModuleDeleter(void *address_in_module)
: library{address_in_module}
{
}
private:
detail::RefCountedLibrary library;
};
/*!
* \brief Use UniqueModulePtr to ensure that your loadable libray outlives
* instances created within it.
*
* Use mir::make_module_ptr(...) or pass a function from your library to the
* constructor, to increase the lifetime of your library:
* \code
* mir::UniqueModulePtr<ExampleInterface> library_entry_point()
* {
* return mir::UniqueModulePtr<SomeInterface>(new Implementation, &library_entry_point);
* }
* \endcode
*
* The default constructor will not try to infer the dynamic library.
*/
template<typename T>
using UniqueModulePtr = std::unique_ptr<T,ModuleDeleter<T>>;
namespace
{
/*!
* \brief make_unique like creation function for UniqueModulePtr
*/
template<typename Type, typename... Args>
inline auto make_module_ptr(Args&&... args)
-> UniqueModulePtr<Type>
{
struct Deleter : ModuleDeleter<Type>
{
Deleter(void* address)
: ModuleDeleter<Type>(address) {}
} deleter(reinterpret_cast<void*>(&make_module_ptr<Type, Args...>));
return UniqueModulePtr<Type>(new Type(std::forward<Args>(args)...), std::move(deleter));
}
}
}
#endif
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