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|
/++
Conversion utilities.
License: $(HTTP www.apache.org/licenses/LICENSE-2.0, Apache-2.0)
Authors: Ilia Ki
+/
module mir.conv;
import mir.exception: toMutable;
public import core.lifetime: emplace;
import std.traits;
private template isMirString(T)
{
static if (isSomeString!T)
{
enum isMirString = true;
}
else
{
static if (__traits(compiles, {import mir.small_string;}))
{
import mir.small_string;
enum isMirString = is(T : SmallString!size, size_t size);
}
else
{
enum isMirString = false;
}
}
}
/++
The `to` template converts a value from one type _to another.
The source type is deduced and the target type must be specified, for example the
expression `to!int(42.0)` converts the number 42 from
`double` _to `int`. The conversion is "unsafe", i.e.,
it does not check for overflow.
+/
template to(T)
{
///
auto ref T to(A...)(auto ref A args)
if (A.length > 0)
{
import mir.utility;
import mir.functional: forward;
static if (A.length == 1 && isImplicitlyConvertible!(A[0], T))
return args[0];
else
static if (is(T == class) && is(typeof(new T(forward!args))))
return new T(forward!args);
else
static if (is(typeof(T(args))))
return T(forward!args);
else
static if (A.length == 1)
{
alias I = A[0];
alias arg = args[0];
static if (is(typeof(cast(T) arg)) && !(isDynamicArray!T && isDynamicArray!I) && !isSomeString!T)
return cast(T) forward!arg;
else
static if (isSomeString!I && is(T == enum))
{
import mir.enums;
uint index = void;
if (getEnumIndexFromKey!T(arg, index)._expect(true))
return index.unsafeEnumFromIndex!T;
static immutable msg = "Can not convert string to the enum " ~ T.stringof;
version (D_Exceptions)
{
static immutable Exception exc = new Exception(msg);
throw exc.toMutable;
}
else
{
assert(0, msg);
}
}
else
static if (is(I == enum) && isSomeString!T)
{
import mir.enums;
uint id = void;
if (getEnumIndex(arg, id)._expect(true))
return enumStrings!I[id];
assert(0);
}
else
static if (isMirString!I && !isSomeString!T)
{
static assert (__traits(compiles, { import mir.parse: fromString; }));
import mir.parse: fromString;
return fromString!(Unqual!T)(arg[]);
}
else
static if (!isSomeString!I && isMirString!T)
{
// static if (is(Unqual!I == typeof(null)))
// {
// enum immutable(T) ret = "null";
// static if (isImplicitlyConvertible!(immutable T, T))
// return ret;
// else
// return .to!T(ret[]);
// }
// else
static if (is(Unqual!I == bool))
{
enum immutable(T) t = "true";
enum immutable(T) f = "false";
auto ret = arg ? t : f;
static if (isImplicitlyConvertible!(immutable T, T))
return ret;
else
return .to!T(ret[]);
}
else
{
static if (isImplicitlyConvertible!(T, string) && __traits(compiles, () {const(char)[] s = arg.toString; return s;}))
{
auto ret = arg.toString;
static if (is(typeof(ret) == string))
return ret;
else
return ret.idup;
}
else
{
static assert (__traits(compiles, { import mir.format: print; }));
import mir.format: print;
static if (isSomeString!T)
{
static if (isNumeric!I)
{
import mir.appender: UnsafeArrayBuffer;
alias C = Unqual!(ForeachType!T);
C[64] array = void;
auto buffer = UnsafeArrayBuffer!C(array);
}
else
{
import mir.appender: scopedBuffer;
auto buffer = scopedBuffer!(Unqual!(ForeachType!T));
}
buffer.print(arg);
static if (isMutable!(ForeachType!(T)))
return buffer.data.dup;
else
return buffer.data.idup;
}
else
{
Unqual!T buffer;
buffer.print(arg);
return buffer;
}
}
}
}
else
static if (is(I : const(C)[], C) && is(T : immutable(C)[]))
{
static if (is(I : immutable(C)[]))
return arg;
else
return idup(arg);
}
else
static if (is(I : const(D)[], D) && is(T : D[]))
{
static if (is(I : D[]))
return arg;
else
return dup(arg);
}
else
static assert(0, T.stringof);
}
else
static assert(0, T.stringof);
}
}
///
@safe pure @nogc
version(mir_core_test) unittest
{
enum E
{
A,
B,
C,
}
assert(to!E("B") == E.B);
assert(to!string(E.B) == "B");
assert(to!string(null) is null);
assert(to!string(true) == "true");
assert(to!string(false) == "false");
enum S : wstring
{
a = "A",
b = "B",
}
assert(to!wstring(S.b) == "B"w);
assert(to!S("B"w) == S.b);
}
/++
Emplace helper function.
+/
void emplaceInitializer(T)(scope ref T chunk) @trusted pure nothrow
{
// Emplace T.init.
// Previously, an immutable static and memcpy were used to hold an initializer.
// With improved unions, this is no longer needed.
union UntypedInit
{
T dummy;
}
static struct UntypedStorage
{
align(T.alignof) void[T.sizeof] dummy;
}
() @trusted {
*cast(UntypedStorage*) &chunk = cast(UntypedStorage) UntypedInit.init;
} ();
}
/++
+/
T[] uninitializedFillDefault(T)(return scope T[] array) nothrow @nogc
{
static if (__VERSION__ < 2083)
{
static if (__traits(isIntegral, T) && 0 == cast(T) (T.init + 1))
{
import core.stdc.string : memset;
memset(array.ptr, 0xff, T.sizeof * array.length);
return array;
}
else
{
pragma(inline, false);
foreach(ref e; array)
emplaceInitializer(e);
return array;
}
}
else
{
static if (__traits(isZeroInit, T))
{
import core.stdc.string : memset;
memset(array.ptr, 0, T.sizeof * array.length);
return array;
}
else static if (__traits(isIntegral, T) && 0 == cast(T) (T.init + 1))
{
import core.stdc.string : memset;
memset(array.ptr, 0xff, T.sizeof * array.length);
return array;
}
else
{
pragma(inline, false);
foreach(ref e; array)
emplaceInitializer(e);
return array;
}
}
}
///
pure nothrow @nogc @system
version(mir_core_test) unittest
{
static struct S { int x = 42; @disable this(this); }
int[5] expected = [42, 42, 42, 42, 42];
S[5] arr = void;
uninitializedFillDefault(arr);
assert((cast(int*) arr.ptr)[0 .. arr.length] == expected);
}
///
@system
version(mir_core_test) unittest
{
int[] a = [1, 2, 4];
uninitializedFillDefault(a);
assert(a == [0, 0, 0]);
}
/++
Destroy structs and unions usnig `__xdtor` member if any.
Do nothing for other types.
+/
void xdestroy(T)(scope T[] ar)
{
static if ((is(T == struct) || is(T == union)) && __traits(hasMember, T, "__xdtor"))
{
static if (__traits(isSame, T, __traits(parent, ar[0].__xdtor)))
{
pragma(inline, false);
foreach_reverse (ref e; ar)
e.__xdtor();
}
}
}
///
nothrow @nogc version(mir_core_test) unittest
{
__gshared int d;
__gshared int c;
struct D { ~this() nothrow @nogc {d++;} }
extern(C++)
struct C { ~this() nothrow @nogc {c++;} }
C[2] carray;
D[2] darray;
carray.xdestroy;
darray.xdestroy;
assert(c == 2);
assert(d == 2);
c = 0;
d = 0;
}
template emplaceRef(T)
{
void emplaceRef(UT, Args...)(ref UT chunk, auto ref Args args)
{
import core.lifetime: forward;
import core.internal.lifetime: emplaceRef;
return emplaceRef!T(chunk, forward!args);
}
}
void emplaceRef(UT, Args...)(ref UT chunk, auto ref Args args)
if (is(UT == Unqual!UT))
{
import core.lifetime: forward;
emplaceRef!UT(chunk, forward!args);
}
|
