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fc7da4dd4f
* native InnoDB partitioning for BY SYSTEM_TIME partitions.
98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
/* Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef TEMPLATE_UTILS_INCLUDED
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#define TEMPLATE_UTILS_INCLUDED
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/**
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Clears a container, but deletes all objects that the elements point to first.
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@tparam Container of pointers.
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*/
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template<typename Container_type>
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void delete_container_pointers(Container_type &container)
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{
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typename Container_type::iterator it1= container.begin();
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typename Container_type::iterator it2= container.end();
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for (; it1 != it2; ++it1)
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{
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delete (*it1);
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}
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container.clear();
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}
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/**
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Clears a container, but frees all objects that the elements point to first.
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@tparam Container of pointers.
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*/
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template<typename Container_type>
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void my_free_container_pointers(Container_type &container)
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{
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typename Container_type::iterator it1= container.begin();
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typename Container_type::iterator it2= container.end();
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for (; it1 != it2; ++it1)
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{
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my_free(*it1);
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}
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container.clear();
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}
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/**
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Casts from one pointer type, to another, without using
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reinterpret_cast or C-style cast:
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foo *f; bar *b= pointer_cast<bar*>(f);
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This avoids having to do:
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foo *f; bar *b= static_cast<b*>(static_cast<void*>(f));
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*/
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template<typename T>
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inline T pointer_cast(void *p)
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{
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return static_cast<T>(p);
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}
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template<typename T>
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inline const T pointer_cast(const void *p)
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{
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return static_cast<const T>(p);
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}
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/**
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Casts from one pointer type to another in a type hierarchy.
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In debug mode, we verify the cast is indeed legal.
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*/
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template<typename Target, typename Source>
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inline Target down_cast(Source arg)
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{
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DBUG_ASSERT(NULL != dynamic_cast<Target>(arg));
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return static_cast<Target>(arg);
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}
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/**
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Sometimes the compiler insists that types be the same and does not do any
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implicit conversion. For example:
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Derived1 *a;
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Derived2 *b; // Derived1 and 2 are children classes of Base
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Base *x= cond ? a : b; // Error, need to force a cast.
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Use:
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Base *x= cond ? implicit_cast<Base*>(a) : implicit_cast<Base*>(b);
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static_cast would work too, but would be less safe (allows any
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pointer-to-pointer conversion, not only up-casts).
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*/
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template<typename To>
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inline To implicit_cast(To x) { return x; }
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#endif // TEMPLATE_UTILS_INCLUDED
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