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range.primitive: Support non copyable elements

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... in all ranges.
This commit is contained in:
Eugen Wissner 2018-11-19 21:37:58 +01:00
parent 7585bf59e7
commit e67a05138e
7 changed files with 133 additions and 58 deletions
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8
source/tanya/algorithm/iteration.d
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@ -3,13 +3,13 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* Range adapters.
* Iteration algorithms.
*
* A range adapter wraps another range and modifies the way, how the original
* These algorithms wrap other ranges and modify the way, how the original
* range is iterated, or the order in which its elements are accessed.
*
* All adapters are lazy algorithms, they request the next element of the
* adapted range on demand.
* All algorithms in this module are lazy, they request the next element of the
* original range on demand.
*
* Copyright: Eugene Wissner 2018.
* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,

5
source/tanya/algorithm/mutation.d
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@ -19,6 +19,7 @@ static import tanya.memory.op;
import tanya.meta.trait;
import tanya.meta.transform;
import tanya.range;
version (unittest) import tanya.test.stub;
private void deinitialize(bool zero, T)(ref T value)
{
@ -554,10 +555,6 @@ if (isInputRange!Range && hasLvalueElements!Range)
@nogc nothrow pure @safe unittest
{
static struct NonCopyable
{
@disable this(this);
}
NonCopyable[] nonCopyable;
initializeAll(nonCopyable);
}

22
source/tanya/conv.d
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@ -27,6 +27,7 @@ import tanya.range.primitive;
version (unittest)
{
import tanya.test.assertion;
import tanya.test.stub;
}
/**
@ -257,32 +258,23 @@ out(result; memory.ptr is result)
// Can emplace structs without a constructor
@nogc nothrow pure @safe unittest
{
static struct SWithDtor
{
~this() @nogc nothrow pure @safe
{
}
}
static assert(is(typeof(emplace!SWithDtor(null, SWithDtor()))));
static assert(is(typeof(emplace!SWithDtor(null))));
static assert(is(typeof(emplace!WithDtor(null, WithDtor()))));
static assert(is(typeof(emplace!WithDtor(null))));
}
// Doesn't call a destructor on uninitialized elements
@nogc nothrow pure @system unittest
{
static struct WithDtor
static struct SWithDtor
{
private bool canBeInvoked = false;
~this() @nogc nothrow pure @safe
{
if (!this.canBeInvoked)
{
assert(false);
}
assert(this.canBeInvoked);
}
}
void[WithDtor.sizeof] memory = void;
auto actual = emplace!WithDtor(memory[], WithDtor(true));
void[SWithDtor.sizeof] memory = void;
auto actual = emplace!SWithDtor(memory[], SWithDtor(true));
assert(actual.canBeInvoked);
}

15
source/tanya/memory/smartref.d
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@ -30,6 +30,7 @@ import tanya.exception;
import tanya.memory;
import tanya.meta.trait;
import tanya.range.primitive;
version (unittest) import tanya.test.stub;
private template Payload(T)
{
@ -611,19 +612,11 @@ do
@nogc @system unittest
{
static bool destroyed;
static struct F
size_t destroyed;
{
~this() @nogc nothrow @safe
{
destroyed = true;
}
auto rc = defaultAllocator.refCounted!WithDtor(destroyed);
}
{
auto rc = defaultAllocator.refCounted!F();
}
assert(destroyed);
assert(destroyed == 1);
}
/**

80
source/tanya/range/primitive.d
View File

@ -316,6 +316,26 @@ private template isDynamicArrayRange(R)
}
}
private struct Primitive(Candidate, string primitive)
{
auto ref returnType(Candidate candidate)
{
mixin("return candidate." ~ primitive ~ ";");
}
alias ReturnType = .ReturnType!returnType;
static assert(!is(ReturnType == void));
enum uint attributes = functionAttributes!returnType
& FunctionAttribute.ref_;
bool opEquals(That)(That) const
{
return is(ReturnType == That.ReturnType)
&& attributes == That.attributes;
}
}
/**
* Determines whether $(D_PARAM R) is an input range.
*
@ -335,11 +355,11 @@ private template isDynamicArrayRange(R)
*/
template isInputRange(R)
{
static if (is(ReturnType!((R r) => r.front()) U)
static if (is(Primitive!(R, "front()") U)
&& is(ReturnType!((R r) => r.empty) == bool)
&& is(typeof(R.popFront())))
{
enum bool isInputRange = !is(U == void);
enum bool isInputRange = true;
}
else
{
@ -415,6 +435,28 @@ template isInputRange(R)
static assert(isInputRange!Range4);
}
// Ranges with non-copyable elements can be input ranges
@nogc nothrow pure @safe unittest
{
@WithLvalueElements
static struct R
{
mixin InputRangeStub!NonCopyable;
}
static assert(isInputRange!R);
}
// Ranges with const non-copyable elements can be input ranges
@nogc nothrow pure @safe unittest
{
@WithLvalueElements
static struct R
{
mixin InputRangeStub!(const(NonCopyable));
}
static assert(isInputRange!R);
}
/**
* Determines whether $(D_PARAM R) is a forward range.
*
@ -521,11 +563,11 @@ template isForwardRange(R)
*/
template isBidirectionalRange(R)
{
static if (is(ReturnType!((R r) => r.back()) U)
static if (is(Primitive!(R, "back()") U)
&& is(typeof(R.popBack())))
{
enum bool isBidirectionalRange = isForwardRange!R
&& is(U == ReturnType!((R r) => r.front()));
&& (U() == Primitive!(R, "front()")());
}
else
{
@ -591,6 +633,17 @@ template isBidirectionalRange(R)
static assert(!isBidirectionalRange!(Range!(int, const int)));
}
// Ranges with non-copyable elements can be bidirectional ranges
@nogc nothrow pure @safe unittest
{
@WithLvalueElements
static struct R
{
mixin BidirectionalRangeStub!NonCopyable;
}
static assert(isBidirectionalRange!R);
}
/**
* Determines whether $(D_PARAM R) is a random-access range.
*
@ -616,11 +669,11 @@ template isBidirectionalRange(R)
*/
template isRandomAccessRange(R)
{
static if (is(ReturnType!((R r) => r.opIndex(size_t.init)) U))
static if (is(Primitive!(R, "opIndex(size_t.init)") U))
{
enum bool isRandomAccessRange = isInputRange!R
&& (hasLength!R || isInfinite!R)
&& is(U == ReturnType!((R r) => r.front()));
&& (U() == Primitive!(R, "front()")());
}
else
{
@ -731,6 +784,17 @@ template isRandomAccessRange(R)
static assert(!isRandomAccessRange!Range4);
}
// Ranges with non-copyable elements can be random-access ranges
@nogc nothrow pure @safe unittest
{
@WithLvalueElements @Infinite
static struct R
{
mixin RandomAccessRangeStub!NonCopyable;
}
static assert(isRandomAccessRange!R);
}
/**
* Puts $(D_PARAM e) into the $(D_PARAM range).
*
@ -1698,10 +1762,6 @@ template hasLvalueElements(R)
// Works with non-copyable elements
@nogc nothrow pure @safe unittest
{
static struct NonCopyable
{
@disable this(this);
}
static assert(hasLvalueElements!(NonCopyable[]));
}

39
source/tanya/test/stub.d
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@ -3,7 +3,7 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* Range generators.
* Range and generic type generators.
*
* Copyright: Eugene Wissner 2018.
* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
@ -248,6 +248,9 @@ mixin template BidirectionalRangeStub(E = int)
* This mixin includes input range primitives as well, but can be combined with
* $(D_PSYMBOL ForwardRangeStub) or $(D_PSYMBOL BidirectionalRangeStub).
*
* Note that a random-access range also requires $(D_PSYMBOL Length) or
* $(D_PARAM Infinite) by definition.
*
* Params:
* E = Element type.
*/
@ -273,3 +276,37 @@ mixin template RandomAccessRangeStub(E = int)
}
}
}
/**
* Struct with a disabled postblit constructor.
*/
struct NonCopyable
{
@disable this(this);
}
/**
* Struct with an elaborate destructor.
*
* The constructor of $(D_PSYMBOL WithDtor) accepts an additional `counter`
* argument, which is incremented by the destructor. $(D_PSYMBOL WithDtor)
* stores a pointer to the passed variable, so the variable can be
* investigated after the struct isn't available anymore.
*/
struct WithDtor
{
size_t* counter;
this(ref size_t counter) @nogc nothrow pure @trusted
{
this.counter = &counter;
}
~this() @nogc nothrow pure @safe
{
if (this.counter !is null)
{
++*this.counter;
}
}
}

22
source/tanya/typecons.d
View File

@ -22,6 +22,7 @@ import tanya.format;
import tanya.functional;
import tanya.meta.metafunction;
import tanya.meta.trait;
version (unittest) import tanya.test.stub;
/**
* $(D_PSYMBOL Tuple) can store two or more heterogeneous objects.
@ -454,29 +455,24 @@ struct Option(T)
// Moving
@nogc nothrow pure @safe unittest
{
static struct NotCopyable
{
@disable this(this);
}
static assert(is(typeof(Option!NotCopyable(NotCopyable()))));
static assert(is(typeof(Option!NonCopyable(NonCopyable()))));
// The value cannot be returned by reference because the default value
// isn't passed by reference
static assert(!is(typeof(Option!DisabledPostblit().or(NotCopyable()))));
static assert(!is(typeof(Option!DisabledPostblit().or(NonCopyable()))));
{
NotCopyable notCopyable;
static assert(is(typeof(Option!NotCopyable().or(notCopyable))));
NonCopyable notCopyable;
static assert(is(typeof(Option!NonCopyable().or(notCopyable))));
}
{
Option!NotCopyable option;
Option!NonCopyable option;
assert(option.isNothing);
option = NotCopyable();
option = NonCopyable();
assert(!option.isNothing);
}
{
Option!NotCopyable option;
Option!NonCopyable option;
assert(option.isNothing);
option = Option!NotCopyable(NotCopyable());
option = Option!NonCopyable(NonCopyable());
assert(!option.isNothing);
}
}