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Move memory functions into memory.lifecycle

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- move
- moveEmplace
- forward
- emplace
- swap
This commit is contained in:
Eugen Wissner
2019-03-17 10:56:44 +01:00
parent 85d7a2b9ca
commit 5ab99cf887
49 changed files with 1156 additions and 1130 deletions
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271
source/tanya/conv.d
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@ -14,15 +14,13 @@
*/
module tanya.conv;
import tanya.algorithm.mutation;
import tanya.container.string;
import tanya.format;
import tanya.memory;
import tanya.memory.op;
deprecated("Use tanya.memory.lifecycle.emplace instead")
public import tanya.memory.lifecycle : emplace;
import tanya.meta.trait;
import tanya.meta.transform;
import tanya.range.array;
import tanya.range.primitive;
import tanya.range;
version (unittest)
{
@ -30,269 +28,6 @@ version (unittest)
import tanya.test.stub;
}
/**
* Constructs a new object of type $(D_PARAM T) in $(D_PARAM memory) with the
* given arguments.
*
* If $(D_PARAM T) is a $(D_KEYWORD class), emplace returns a class reference
* of type $(D_PARAM T), otherwise a pointer to the constructed object is
* returned.
*
* If $(D_PARAM T) is a nested class inside another class, $(D_PARAM outer)
* should be an instance of the outer class.
*
* $(D_PARAM args) are arguments for the constructor of $(D_PARAM T). If
* $(D_PARAM T) isn't an aggregate type and doesn't have a constructor,
* $(D_PARAM memory) can be initialized to `args[0]` if `Args.length == 1`,
* `Args[0]` should be implicitly convertible to $(D_PARAM T) then.
*
* Params:
* T = Constructed type.
* U = Type of the outer class if $(D_PARAM T) is a nested class.
* Args = Types of the constructor arguments if $(D_PARAM T) has a constructor
* or the type of the initial value.
* outer = Outer class instance if $(D_PARAM T) is a nested class.
* args = Constructor arguments if $(D_PARAM T) has a constructor or the
* initial value.
*
* Returns: New instance of type $(D_PARAM T) constructed in $(D_PARAM memory).
*
* Precondition: `memory.length == stateSize!T`.
* Postcondition: $(D_PARAM memory) and the result point to the same memory.
*/
T emplace(T, U, Args...)(void[] memory, U outer, auto ref Args args)
if (!isAbstractClass!T && isInnerClass!T && is(typeof(T.outer) == U))
in (memory.length >= stateSize!T)
out (result; memory.ptr is (() @trusted => cast(void*) result)())
{
copy(typeid(T).initializer, memory);
auto result = (() @trusted => cast(T) memory.ptr)();
result.outer = outer;
static if (is(typeof(result.__ctor(args))))
{
result.__ctor(args);
}
return result;
}
/// ditto
T emplace(T, Args...)(void[] memory, auto ref Args args)
if (is(T == class) && !isAbstractClass!T && !isInnerClass!T)
in (memory.length == stateSize!T)
out (result; memory.ptr is (() @trusted => cast(void*) result)())
{
copy(typeid(T).initializer, memory);
auto result = (() @trusted => cast(T) memory.ptr)();
static if (is(typeof(result.__ctor(args))))
{
result.__ctor(args);
}
return result;
}
///
@nogc nothrow pure @safe unittest
{
import tanya.memory : stateSize;
class C
{
int i = 5;
class Inner
{
int i;
this(int param) pure nothrow @safe @nogc
{
this.i = param;
}
}
}
ubyte[stateSize!C] memory1;
ubyte[stateSize!(C.Inner)] memory2;
auto c = emplace!C(memory1);
assert(c.i == 5);
auto inner = emplace!(C.Inner)(memory2, c, 8);
assert(c.i == 5);
assert(inner.i == 8);
assert(inner.outer is c);
}
/// ditto
T* emplace(T, Args...)(void[] memory, auto ref Args args)
if (!isAggregateType!T && (Args.length <= 1))
in (memory.length >= T.sizeof)
out (result; memory.ptr is result)
{
auto result = (() @trusted => cast(T*) memory.ptr)();
static if (Args.length == 1)
{
*result = T(args[0]);
}
else
{
*result = T.init;
}
return result;
}
private void initializeOne(T)(ref void[] memory, ref T* result) @trusted
{
static if (!hasElaborateAssign!T && isAssignable!T)
{
*result = T.init;
}
else static if (__VERSION__ >= 2083 // __traits(isZeroInit) available.
&& __traits(isZeroInit, T))
{
memory.ptr[0 .. T.sizeof].fill!0;
}
else
{
static immutable T init = T.init;
copy((&init)[0 .. 1], memory);
}
}
/// ditto
T* emplace(T, Args...)(void[] memory, auto ref Args args)
if (!isPolymorphicType!T && isAggregateType!T)
in (memory.length >= T.sizeof)
out (result; memory.ptr is result)
{
auto result = (() @trusted => cast(T*) memory.ptr)();
static if (Args.length == 0)
{
static assert(is(typeof({ static T t; })),
"Default constructor is disabled");
initializeOne(memory, result);
}
else static if (is(typeof(result.__ctor(args))))
{
initializeOne(memory, result);
result.__ctor(args);
}
else static if (Args.length == 1 && is(typeof({ T t = args[0]; })))
{
((ref arg) @trusted =>
copy((cast(void*) &arg)[0 .. T.sizeof], memory))(args[0]);
static if (hasElaborateCopyConstructor!T)
{
result.__postblit();
}
}
else static if (is(typeof({ T t = T(args); })))
{
auto init = T(args);
(() @trusted => moveEmplace(init, *result))();
}
else
{
static assert(false,
"Unable to construct value with the given arguments");
}
return result;
}
///
@nogc nothrow pure @safe unittest
{
ubyte[4] memory;
auto i = emplace!int(memory);
static assert(is(typeof(i) == int*));
assert(*i == 0);
i = emplace!int(memory, 5);
assert(*i == 5);
static struct S
{
int i;
@disable this();
@disable this(this);
this(int i) @nogc nothrow pure @safe
{
this.i = i;
}
}
auto s = emplace!S(memory, 8);
static assert(is(typeof(s) == S*));
assert(s.i == 8);
}
// Handles "Cannot access frame pointer" error.
@nogc nothrow pure @safe unittest
{
struct F
{
~this() @nogc nothrow pure @safe
{
}
}
static assert(is(typeof(emplace!F((void[]).init))));
}
// Can emplace structs without a constructor
@nogc nothrow pure @safe unittest
{
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 SWithDtor
{
private bool canBeInvoked = false;
~this() @nogc nothrow pure @safe
{
assert(this.canBeInvoked);
}
}
void[SWithDtor.sizeof] memory = void;
auto actual = emplace!SWithDtor(memory[], SWithDtor(true));
assert(actual.canBeInvoked);
}
// Initializes structs if no arguments are given
@nogc nothrow pure @safe unittest
{
static struct SEntry
{
byte content;
}
ubyte[1] mem = [3];
assert(emplace!SEntry(cast(void[]) mem[0 .. 1]).content == 0);
}
// Postblit is called when emplacing a struct
@nogc nothrow pure @system unittest
{
static struct S
{
bool called = false;
this(this) @nogc nothrow pure @safe
{
this.called = true;
}
}
S target;
S* sp = &target;
emplace!S(sp[0 .. 1], S());
assert(target.called);
}
/**
* Thrown if a type conversion fails.
*/