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/**
This module contains some common utilities used by containers.
This module is a submodule of $(MREF std, container).
Source: $(PHOBOSSRC std/container/util.d)
Copyright: 2010- Andrei Alexandrescu. All rights reserved by the respective holders.
License: Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at $(HTTP
boost.org/LICENSE_1_0.txt)).
Authors: $(HTTP erdani.com, Andrei Alexandrescu)
$(SCRIPT inhibitQuickIndex = 1;)
*/
module std.container.util;
/**
Returns an initialized object. This function is mainly for eliminating
construction differences between structs and classes. It allows code to not
worry about whether the type it's constructing is a struct or a class.
*/
template make(T)
if (is(T == struct) || is(T == class))
{
T make(Args...)(Args arguments)
if (is(T == struct) && __traits(compiles, T(arguments)))
{
// constructing an std.container.Array without arguments,
// does not initialize its payload and is equivalent
// to a null reference. We therefore construct an empty container
// by passing an empty array to its constructor.
// https://issues.dlang.org/show_bug.cgi?id=13872.
static if (arguments.length == 0)
{
import std.range.primitives : ElementType;
alias ET = ElementType!(T.Range);
return T(ET[].init);
}
else
return T(arguments);
}
T make(Args...)(Args arguments)
if (is(T == class) && __traits(compiles, new T(arguments)))
{
return new T(arguments);
}
}
///
@system unittest
{
import std.algorithm.comparison : equal;
import std.container;
auto arr = make!(Array!int)([4, 2, 3, 1]);
assert(equal(arr[], [4, 2, 3, 1]));
auto rbt = make!(RedBlackTree!(int, "a > b"))([4, 2, 3, 1]);
assert(equal(rbt[], [4, 3, 2, 1]));
alias makeList = make!(SList!int);
auto slist = makeList(1, 2, 3);
assert(equal(slist[], [1, 2, 3]));
}
@system unittest
{
import std.algorithm.comparison : equal;
import std.container;
auto arr1 = make!(Array!dchar)();
assert(arr1.empty);
auto arr2 = make!(Array!dchar)("hello"d);
assert(equal(arr2[], "hello"d));
auto rtb1 = make!(RedBlackTree!dchar)();
assert(rtb1.empty);
auto rtb2 = make!(RedBlackTree!dchar)('h', 'e', 'l', 'l', 'o');
assert(equal(rtb2[], "ehlo"d));
}
// https://issues.dlang.org/show_bug.cgi?id=8895
@safe unittest
{
import std.algorithm.comparison : equal;
import std.container;
auto a = make!(DList!int)(1,2,3,4);
auto b = make!(DList!int)(1,2,3,4);
auto c = make!(DList!int)(1,2,3,5);
auto d = make!(DList!int)(1,2,3,4,5);
assert(a == b); // this better terminate!
assert(a != c);
assert(a != d);
}
/**
* Convenience function for constructing a generic container.
*/
template make(alias Container, Args...)
if (!is(Container))
{
import std.range : isInputRange, isInfinite;
import std.traits : isDynamicArray;
auto make(Range)(Range range)
if (!isDynamicArray!Range && isInputRange!Range && !isInfinite!Range)
{
import std.range : ElementType;
return .make!(Container!(ElementType!Range, Args))(range);
}
auto make(T)(T[] items...)
if (!isInfinite!T)
{
return .make!(Container!(T, Args))(items);
}
}
/// forbid construction from infinite range
@safe unittest
{
import std.container.array : Array;
import std.range : only, repeat;
import std.range.primitives : isInfinite;
static assert(__traits(compiles, { auto arr = make!Array(only(5)); }));
static assert(!__traits(compiles, { auto arr = make!Array(repeat(5)); }));
}
///
@system unittest
{
import std.algorithm.comparison : equal;
import std.container.array, std.container.rbtree, std.container.slist;
import std.range : iota;
auto arr = make!Array(iota(5));
assert(equal(arr[], [0, 1, 2, 3, 4]));
auto rbtmax = make!(RedBlackTree, "a > b")(iota(5));
assert(equal(rbtmax[], [4, 3, 2, 1, 0]));
auto rbtmin = make!RedBlackTree(4, 1, 3, 2);
assert(equal(rbtmin[], [1, 2, 3, 4]));
alias makeList = make!SList;
auto list = makeList(1, 7, 42);
assert(equal(list[], [1, 7, 42]));
}
@safe unittest
{
import std.algorithm.comparison : equal;
import std.container.rbtree;
auto rbtmin = make!(RedBlackTree, "a < b", false)(3, 2, 2, 1);
assert(equal(rbtmin[], [1, 2, 3]));
}
// https://issues.dlang.org/show_bug.cgi?id=13872
@system unittest
{
import std.container;
auto tree1 = make!(RedBlackTree!int)();
auto refToTree1 = tree1;
refToTree1.insert(1);
assert(1 in tree1);
auto array1 = make!(Array!int)();
auto refToArray1 = array1;
refToArray1.insertBack(1);
assert(!array1.empty);
auto slist = make!(SList!int)();
auto refToSlist = slist;
refToSlist.insert(1);
assert(!slist.empty);
auto dlist = make!(DList!int)();
auto refToDList = dlist;
refToDList.insert(1);
assert(!dlist.empty);
}
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