85 lines
2.0 KiB
D
85 lines
2.0 KiB
D
/* This Source Code Form is subject to the terms of the Mozilla Public
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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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/**
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* Copyright: Eugene Wissner 2016.
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* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
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* Mozilla Public License, v. 2.0).
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* Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
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*/
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module tanya.memory;
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import std.algorithm.mutation;
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public import std.experimental.allocator;
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public import tanya.memory.allocator;
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public import tanya.memory.types;
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shared Allocator allocator;
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shared static this() nothrow @safe @nogc
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{
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import tanya.memory.mmappool;
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allocator = MmapPool.instance;
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}
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@property ref shared(Allocator) defaultAllocator() nothrow @safe @nogc
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{
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return allocator;
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}
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@property void defaultAllocator(shared(Allocator) allocator) nothrow @safe @nogc
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{
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.allocator = allocator;
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}
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/**
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* Params:
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* T = Element type of the array being created.
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* allocator = The allocator used for getting memory.
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* array = A reference to the array being changed.
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* length = New array length.
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* init = The value to fill the new part of the array with if it becomes
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* larger.
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*
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* Returns: $(D_KEYWORD true) upon success, $(D_KEYWORD false) if memory could
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* not be reallocated. In the latter
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*/
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bool resizeArray(T)(shared Allocator allocator,
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ref T[] array,
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in size_t length,
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T init = T.init)
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{
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void[] buf = array;
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immutable oldLength = array.length;
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if (!allocator.reallocate(buf, length * T.sizeof))
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{
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return false;
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}
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array = cast(T[]) buf;
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if (oldLength < length)
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{
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array[oldLength .. $].uninitializedFill(init);
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}
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return true;
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}
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///
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unittest
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{
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int[] p;
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defaultAllocator.resizeArray(p, 20);
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assert(p.length == 20);
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defaultAllocator.resizeArray(p, 30);
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assert(p.length == 30);
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defaultAllocator.resizeArray(p, 10);
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assert(p.length == 10);
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defaultAllocator.resizeArray(p, 0);
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assert(p is null);
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}
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