memory/deleter: add deferred_delete and deferred_unique
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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* Copyright 2015-2021 Danny Robson <danny@nerdcruft.net>
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*/
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*/
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#ifndef __UTIL_MEMORY_DELETER_HPP
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#pragma once
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#define __UTIL_MEMORY_DELETER_HPP
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#include <functional>
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#include <functional>
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#include <memory>
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namespace cruft::memory {
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namespace cruft::memory {
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///////////////////////////////////////////////////////////////////////////
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/// A deleter object that is deliberately left undefined.
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///
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/// This allows it to be used in places where the definition of `ValueT`
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/// would otherwise be required (eg, std::unique_ptr). This requires that
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/// the body be explicitly defined by the user; see `DEFERRED_DELETE`.
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template <typename ValueT>
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struct deferred_delete {
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void operator() (ValueT*) const;
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};
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///------------------------------------------------------------------------
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/// An implementation of deferred delete that just calls `delete` directly.
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#define DEFERRED_DELETE(KLASS) \
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template <> \
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void \
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::cruft::memory::deferred_delete<KLASS>::operator() (KLASS *ptr) const \
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{ delete ptr; }
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///////////////////////////////////////////////////////////////////////////
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/// A convenience typedef for a unique_ptr that uses a deferred_delete
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/// deleter object.
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template <typename ValueT>
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using deferred_unique = std::unique_ptr<ValueT, deferred_delete<ValueT>>;
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///------------------------------------------------------------------------
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/// A convenience function for creation of deferred_unique objects
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/// analogous to std::make_unique
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template <typename ValueT, typename ...ArgsT>
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deferred_unique<ValueT>
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make_deferred_unique (ArgsT &&...args)
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{
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return deferred_unique<ValueT> (
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new ValueT (
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std::forward<ArgsT> (args)...
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)
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);
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename T>
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template <typename T>
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class func_deleter {
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class func_deleter {
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public:
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public:
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@ -53,6 +97,4 @@ namespace cruft::memory {
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private:
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private:
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OwnerT& m_owner;
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OwnerT& m_owner;
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};
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};
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}
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}
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#endif
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