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traits.d
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traits.d
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// Written in the D programming language.
/**
* Templates with which to extract information about types and symbols at
* compile time.
*
* Macros:
* WIKI = Phobos/StdTraits
*
* Copyright: Copyright Digital Mars 2005 - 2009.
* License: <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
* Authors: $(WEB digitalmars.com, Walter Bright),
* Tomasz Stachowiak ($(D isExpressionTuple)),
* $(WEB erdani.org, Andrei Alexandrescu),
* Shin Fujishiro,
* $(WEB octarineparrot.com, Robert Clipsham),
* $(WEB klickverbot.at, David Nadlinger),
* Kenji Hara,
* Shoichi Kato
* Source: $(PHOBOSSRC std/_traits.d)
*/
/* Copyright Digital Mars 2005 - 2009.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
module std.traits;
import std.algorithm;
import std.typetuple;
import std.typecons;
import core.vararg;
///////////////////////////////////////////////////////////////////////////////
// Functions
///////////////////////////////////////////////////////////////////////////////
// Petit demangler
// (this or similar thing will eventually go to std.demangle if necessary
// ctfe stuffs are available)
private
{
struct Demangle(T)
{
T value; // extracted information
string rest;
}
/* Demangles mstr as the storage class part of Argument. */
Demangle!uint demangleParameterStorageClass(string mstr)
{
uint pstc = 0; // parameter storage class
// Argument --> Argument2 | M Argument2
if (mstr.length > 0 && mstr[0] == 'M')
{
pstc |= ParameterStorageClass.scope_;
mstr = mstr[1 .. $];
}
// Argument2 --> Type | J Type | K Type | L Type
ParameterStorageClass stc2;
switch (mstr.length ? mstr[0] : char.init)
{
case 'J': stc2 = ParameterStorageClass.out_; break;
case 'K': stc2 = ParameterStorageClass.ref_; break;
case 'L': stc2 = ParameterStorageClass.lazy_; break;
default : break;
}
if (stc2 != ParameterStorageClass.init)
{
pstc |= stc2;
mstr = mstr[1 .. $];
}
return Demangle!uint(pstc, mstr);
}
/* Demangles mstr as FuncAttrs. */
Demangle!uint demangleFunctionAttributes(string mstr)
{
enum LOOKUP_ATTRIBUTE =
[
'a': FunctionAttribute.pure_,
'b': FunctionAttribute.nothrow_,
'c': FunctionAttribute.ref_,
'd': FunctionAttribute.property,
'e': FunctionAttribute.trusted,
'f': FunctionAttribute.safe
];
uint atts = 0;
// FuncAttrs --> FuncAttr | FuncAttr FuncAttrs
// FuncAttr --> empty | Na | Nb | Nc | Nd | Ne | Nf
// except 'Ng' == inout, because it is a qualifier of function type
while (mstr.length >= 2 && mstr[0] == 'N' && mstr[1] != 'g')
{
if (FunctionAttribute att = LOOKUP_ATTRIBUTE[ mstr[1] ])
{
atts |= att;
mstr = mstr[2 .. $];
}
else assert(0);
}
return Demangle!uint(atts, mstr);
}
alias TypeTuple!(byte, ubyte, short, ushort, int, uint, long, ulong) IntegralTypeList;
alias TypeTuple!(byte, short, int, long) SignedIntTypeList;
alias TypeTuple!(ubyte, ushort, uint, ulong) UnsignedIntTypeList;
alias TypeTuple!(float, double, real) FloatingPointTypeList;
alias TypeTuple!(ifloat, idouble, ireal) ImaginaryTypeList;
alias TypeTuple!(cfloat, cdouble, creal) ComplexTypeList;
alias TypeTuple!(IntegralTypeList, FloatingPointTypeList) NumericTypeList;
alias TypeTuple!(char, wchar, dchar) CharTypeList;
/* Get an expression typed as T, like T.init */
template defaultInit(T)
{
static if (!is(typeof({ T v = void; }))) // inout(U)
@property T defaultInit(T v = T.init);
else
@property T defaultInit();
}
}
version(unittest)
{
template MutableOf(T) { alias T MutableOf; }
template ConstOf(T) { alias const(T) ConstOf; }
template SharedOf(T) { alias shared(T) SharedOf; }
template SharedConstOf(T) { alias shared(const(T)) SharedConstOf; }
template ImmutableOf(T) { alias immutable(T) ImmutableOf; }
template WildOf(T) { alias inout(T) WildOf; }
template SharedWildOf(T) { alias shared(inout(T)) SharedWildOf; }
alias TypeTuple!(MutableOf, ConstOf, SharedOf, SharedConstOf, ImmutableOf) TypeQualifierList;
struct SubTypeOf(T)
{
T val;
alias val this;
}
}
/**
* Get the full package name for the given symbol.
* Example:
* ---
* import std.traits;
* static assert(packageName!packageName == "std");
* ---
*/
template packageName(alias T)
{
static if (is(typeof(__traits(parent, T))))
enum parent = packageName!(__traits(parent, T));
else
enum string parent = null;
static if (T.stringof.startsWith("package "))
enum packageName = (parent ? parent ~ '.' : "") ~ T.stringof[8 .. $];
else static if (parent)
enum packageName = parent;
else
static assert(false, T.stringof ~ " has no parent");
}
unittest
{
// Commented out because of dmd @@@BUG8922@@@
// static assert(packageName!std == "std"); // this package (currently: "std.std")
static assert(packageName!(std.traits) == "std"); // this module
static assert(packageName!packageName == "std"); // symbol in this module
static assert(packageName!(std.algorithm) == "std"); // other module from same package
import core.sync.barrier; // local import
static assert(packageName!core == "core");
static assert(packageName!(core.sync) == "core.sync");
static assert(packageName!Barrier == "core.sync");
}
version(unittest)
{
import core.sync.barrier; // global import
static assert(packageName!core == "core");
static assert(packageName!(core.sync) == "core.sync");
static assert(packageName!Barrier == "core.sync");
}
/**
* Get the module name (including package) for the given symbol.
* Example:
* ---
* import std.traits;
* static assert(moduleName!moduleName == "std.traits");
* ---
*/
template moduleName(alias T)
{
static assert(!T.stringof.startsWith("package "), "cannot get the module name for a package");
static if (T.stringof.startsWith("module "))
{
static if (__traits(compiles, packageName!T))
enum packagePrefix = packageName!T ~ '.';
else
enum packagePrefix = "";
enum moduleName = packagePrefix ~ T.stringof[7..$];
}
else
alias moduleName!(__traits(parent, T)) moduleName;
}
unittest
{
static assert(!__traits(compiles, moduleName!std));
static assert(moduleName!(std.traits) == "std.traits"); // this module
static assert(moduleName!moduleName == "std.traits"); // symbol in this module
static assert(moduleName!(std.algorithm) == "std.algorithm"); // other module
static assert(moduleName!(std.algorithm.map) == "std.algorithm"); // symbol in other module
import core.sync.barrier; // local import
static assert(!__traits(compiles, moduleName!(core.sync)));
static assert(moduleName!(core.sync.barrier) == "core.sync.barrier");
static assert(moduleName!Barrier == "core.sync.barrier");
}
version(unittest)
{
import core.sync.barrier; // global import
static assert(!__traits(compiles, moduleName!(core.sync)));
static assert(moduleName!(core.sync.barrier) == "core.sync.barrier");
static assert(moduleName!Barrier == "core.sync.barrier");
}
/***
* Get the fully qualified name of a type or a symbol. Can act as an intelligent type/symbol to string converter.
* Example:
* ---
* module mymodule;
* import std.traits;
* struct MyStruct {}
* static assert(fullyQualifiedName!(const MyStruct[]) == "const(mymodule.MyStruct[])");
* static assert(fullyQualifiedName!fullyQualifiedName == "std.traits.fullyQualifiedName");
* ---
*/
template fullyQualifiedName(T...)
if (T.length == 1)
{
static if (is(T))
enum fullyQualifiedName = fullyQualifiedNameImplForTypes!(T[0], false, false, false, false);
else
enum fullyQualifiedName = fullyQualifiedNameImplForSymbols!(T[0]);
}
version(unittest)
{
// Used for both fullyQualifiedNameImplForTypes and fullyQualifiedNameImplForSymbols unittests
private struct QualifiedNameTests
{
struct Inner
{
}
ref const(Inner[string]) func( ref Inner var1, lazy scope string var2 );
inout Inner inoutFunc(inout Inner);
shared(const(Inner[string])[]) data;
const Inner delegate(double, string) @safe nothrow deleg;
inout int delegate(inout int) inout inoutDeleg;
Inner function(out double, string) funcPtr;
extern(C) Inner function(double, string) cFuncPtr;
extern(C) void cVarArg(int, ...);
void dVarArg(...);
void dVarArg2(int, ...);
void typesafeVarArg(int[] ...);
Inner[] array;
Inner[16] sarray;
Inner[Inner] aarray;
const(Inner[const(Inner)]) qualAarray;
shared(immutable(Inner) delegate(ref double, scope string) const shared @trusted nothrow) attrDeleg;
}
}
private template fullyQualifiedNameImplForSymbols(alias T)
{
static if (__traits(compiles, __traits(parent, T)))
enum parentPrefix = fullyQualifiedNameImplForSymbols!(__traits(parent, T)) ~ '.';
else
enum parentPrefix = null;
enum fullyQualifiedNameImplForSymbols = parentPrefix ~ (s)
{
if(s.skipOver("package ") || s.skipOver("module "))
return s;
return s.findSplit("(")[0];
}(T.stringof);
}
unittest
{
// Make sure those 2 are the same
static assert(fullyQualifiedNameImplForSymbols!fullyQualifiedName
== fullyQualifiedName!fullyQualifiedName);
// Main tests
alias fqn = fullyQualifiedName;
static assert(fqn!fqn == "std.traits.fullyQualifiedName");
static assert(fqn!(QualifiedNameTests.Inner) == "std.traits.QualifiedNameTests.Inner");
import core.sync.barrier;
static assert(fullyQualifiedName!Barrier == "core.sync.barrier.Barrier");
}
private template fullyQualifiedNameImplForTypes(T,
bool alreadyConst, bool alreadyImmutable, bool alreadyShared, bool alreadyInout)
{
import std.string;
// Convenience tags
enum {
_const = 0,
_immutable = 1,
_shared = 2,
_inout = 3
}
alias TypeTuple!(is(T == const), is(T == immutable), is(T == shared), is(T == inout)) qualifiers;
alias TypeTuple!(false, false, false, false) noQualifiers;
string storageClassesString(uint psc)() @property
{
alias ParameterStorageClass PSC;
return format("%s%s%s%s",
psc & PSC.scope_ ? "scope " : "",
psc & PSC.out_ ? "out " : "",
psc & PSC.ref_ ? "ref " : "",
psc & PSC.lazy_ ? "lazy " : ""
);
}
string parametersTypeString(T)() @property
{
import std.array, std.algorithm, std.range;
alias ParameterTypeTuple!(T) parameters;
alias ParameterStorageClassTuple!(T) parameterStC;
enum variadic = variadicFunctionStyle!T;
static if (variadic == Variadic.no)
enum variadicStr = "";
else static if (variadic == Variadic.c)
enum variadicStr = ", ...";
else static if (variadic == Variadic.d)
enum variadicStr = parameters.length ? ", ..." : "...";
else static if (variadic == Variadic.typesafe)
enum variadicStr = " ...";
else
static assert(0, "New variadic style has been added, please update fullyQualifiedName implementation");
static if (parameters.length)
{
string result = join(
map!(a => format("%s%s", a[0], a[1]))(
zip([staticMap!(storageClassesString, parameterStC)],
[staticMap!(fullyQualifiedName, parameters)])
),
", "
);
return result ~= variadicStr;
}
else
return variadicStr;
}
string linkageString(T)() @property
{
enum linkage = functionLinkage!T;
if (linkage != "D")
return format("extern(%s) ", linkage);
else
return "";
}
string functionAttributeString(T)() @property
{
alias FunctionAttribute FA;
enum attrs = functionAttributes!T;
static if (attrs == FA.none)
return "";
else
return format("%s%s%s%s%s%s",
attrs & FA.pure_ ? " pure" : "",
attrs & FA.nothrow_ ? " nothrow" : "",
attrs & FA.ref_ ? " ref" : "",
attrs & FA.property ? " @property" : "",
attrs & FA.trusted ? " @trusted" : "",
attrs & FA.safe ? " @safe" : ""
);
}
string addQualifiers(string typeString,
bool addConst, bool addImmutable, bool addShared, bool addInout)
{
auto result = typeString;
if (addShared)
{
result = format("shared(%s)", result);
}
if (addConst || addImmutable || addInout)
{
result = format("%s(%s)",
addConst ? "const" :
addImmutable ? "immutable" : "inout",
result
);
}
return result;
}
// Convenience template to avoid copy-paste
template chain(string current)
{
enum chain = addQualifiers(current,
qualifiers[_const] && !alreadyConst,
qualifiers[_immutable] && !alreadyImmutable,
qualifiers[_shared] && !alreadyShared,
qualifiers[_inout] && !alreadyInout);
}
static if (is(T == string))
{
enum fullyQualifiedNameImplForTypes = "string";
}
else static if (is(T == wstring))
{
enum fullyQualifiedNameImplForTypes = "wstring";
}
else static if (is(T == dstring))
{
enum fullyQualifiedNameImplForTypes = "dstring";
}
else static if (isBasicType!T || is(T == enum))
{
enum fullyQualifiedNameImplForTypes = chain!((Unqual!T).stringof);
}
else static if (isAggregateType!T)
{
enum fullyQualifiedNameImplForTypes = chain!(fullyQualifiedNameImplForSymbols!T);
}
else static if (isStaticArray!T)
{
import std.conv;
enum fullyQualifiedNameImplForTypes = chain!(
format("%s[%s]", fullyQualifiedNameImplForTypes!(typeof(T.init[0]), qualifiers), T.length)
);
}
else static if (isArray!T)
{
enum fullyQualifiedNameImplForTypes = chain!(
format("%s[]", fullyQualifiedNameImplForTypes!(typeof(T.init[0]), qualifiers))
);
}
else static if (isAssociativeArray!T)
{
enum fullyQualifiedNameImplForTypes = chain!(
format("%s[%s]", fullyQualifiedNameImplForTypes!(ValueType!T, qualifiers), fullyQualifiedNameImplForTypes!(KeyType!T, noQualifiers))
);
}
else static if (isSomeFunction!T)
{
static if (is(T F == delegate))
{
enum qualifierString = format("%s%s",
is(F == shared) ? " shared" : "",
is(F == inout) ? " inout" :
is(F == immutable) ? " immutable" :
is(F == const) ? " const" : ""
);
enum formatStr = "%s%s delegate(%s)%s%s";
enum fullyQualifiedNameImplForTypes = chain!(
format(formatStr, linkageString!T, fullyQualifiedNameImplForTypes!(ReturnType!T, noQualifiers),
parametersTypeString!(T), functionAttributeString!T, qualifierString)
);
}
else
{
static if (isFunctionPointer!T)
enum formatStr = "%s%s function(%s)%s";
else
enum formatStr = "%s%s(%s)%s";
enum fullyQualifiedNameImplForTypes = chain!(
format(formatStr, linkageString!T, fullyQualifiedNameImplForTypes!(ReturnType!T, noQualifiers),
parametersTypeString!(T), functionAttributeString!T)
);
}
}
else static if (isPointer!T)
{
enum fullyQualifiedNameImplForTypes = chain!(
format("%s*", fullyQualifiedNameImplForTypes!(PointerTarget!T, qualifiers))
);
}
else
// In case something is forgotten
static assert(0, "Unrecognized type " ~ T.stringof ~ ", can't convert to fully qualified string");
}
unittest
{
import std.string;
// Verify those 2 are the same for simple case
alias Ambiguous = const(QualifiedNameTests.Inner);
static assert(fullyQualifiedName!Ambiguous == fullyQualifiedNameImplForTypes!(Ambiguous, false, false, false, false));
// Main tests
alias fullyQualifiedName fqn;
enum inner_name = "std.traits.QualifiedNameTests.Inner";
with (QualifiedNameTests)
{
// Special cases
static assert(fqn!(string) == "string");
static assert(fqn!(wstring) == "wstring");
static assert(fqn!(dstring) == "dstring");
// Basic qualified name
static assert(fqn!(Inner) == inner_name);
// Array types
static assert(fqn!(typeof(array)) == format("%s[]", inner_name));
static assert(fqn!(typeof(sarray)) == format("%s[16]", inner_name));
static assert(fqn!(typeof(aarray)) == format("%s[%s]", inner_name, inner_name));
// qualified key for AA
static assert(fqn!(typeof(qualAarray)) == format("const(%s[const(%s)])", inner_name, inner_name));
// Qualified composed data types
static assert(fqn!(typeof(data)) == format("shared(const(%s[string])[])", inner_name));
// Function types + function attributes
static assert(fqn!(typeof(func)) == format("const(%s[string])(ref %s, scope lazy string) ref", inner_name, inner_name));
static assert(fqn!(typeof(inoutFunc)) == format("inout(%s(inout(%s)))", inner_name, inner_name));
static assert(fqn!(typeof(deleg)) == format("const(%s delegate(double, string) nothrow @safe)", inner_name));
static assert(fqn!(typeof(inoutDeleg)) == "inout(int delegate(inout(int)) inout)");
static assert(fqn!(typeof(funcPtr)) == format("%s function(out double, string)", inner_name));
static assert(fqn!(typeof(cFuncPtr)) == format("extern(C) %s function(double, string)", inner_name));
// Delegate type with qualified function type
static assert(fqn!(typeof(attrDeleg)) == format("shared(immutable(%s) "
"delegate(ref double, scope string) nothrow @trusted shared const)", inner_name));
// Variable argument function types
static assert(fqn!(typeof(cVarArg)) == "extern(C) void(int, ...)");
static assert(fqn!(typeof(dVarArg)) == "void(...)");
static assert(fqn!(typeof(dVarArg2)) == "void(int, ...)");
static assert(fqn!(typeof(typesafeVarArg)) == "void(int[] ...)");
}
}
/***
* Get the type of the return value from a function,
* a pointer to function, a delegate, a struct
* with an opCall, a pointer to a struct with an opCall,
* or a class with an $(D opCall). Please note that $(D_KEYWORD ref)
* is not part of a type, but the attribute of the function
* (see template $(LREF functionAttributes)).
* Example:
* ---
* import std.traits;
* int foo();
* ReturnType!foo x; // x is declared as int
* ---
*/
template ReturnType(func...)
if (func.length == 1 && isCallable!func)
{
static if (is(FunctionTypeOf!func R == return))
alias R ReturnType;
else
static assert(0, "argument has no return type");
}
unittest
{
struct G
{
int opCall (int i) { return 1;}
}
alias ReturnType!G ShouldBeInt;
static assert(is(ShouldBeInt == int));
G g;
static assert(is(ReturnType!g == int));
G* p;
alias ReturnType!p pg;
static assert(is(pg == int));
class C
{
int opCall (int i) { return 1;}
}
static assert(is(ReturnType!C == int));
C c;
static assert(is(ReturnType!c == int));
class Test
{
int prop() @property { return 0; }
}
alias ReturnType!(Test.prop) R_Test_prop;
static assert(is(R_Test_prop == int));
alias ReturnType!((int a) { return a; }) R_dglit;
static assert(is(R_dglit == int));
}
/***
Get, as a tuple, the types of the parameters to a function, a pointer
to function, a delegate, a struct with an $(D opCall), a pointer to a
struct with an $(D opCall), or a class with an $(D opCall).
Example:
---
import std.traits;
int foo(int, long);
void bar(ParameterTypeTuple!foo); // declares void bar(int, long);
void abc(ParameterTypeTuple!foo[1]); // declares void abc(long);
---
*/
template ParameterTypeTuple(func...)
if (func.length == 1 && isCallable!func)
{
static if (is(FunctionTypeOf!func P == function))
alias P ParameterTypeTuple;
else
static assert(0, "argument has no parameters");
}
unittest
{
int foo(int i, bool b) { return 0; }
static assert(is(ParameterTypeTuple!foo == TypeTuple!(int, bool)));
static assert(is(ParameterTypeTuple!(typeof(&foo)) == TypeTuple!(int, bool)));
struct S { real opCall(real r, int i) { return 0.0; } }
S s;
static assert(is(ParameterTypeTuple!S == TypeTuple!(real, int)));
static assert(is(ParameterTypeTuple!(S*) == TypeTuple!(real, int)));
static assert(is(ParameterTypeTuple!s == TypeTuple!(real, int)));
class Test
{
int prop() @property { return 0; }
}
alias ParameterTypeTuple!(Test.prop) P_Test_prop;
static assert(P_Test_prop.length == 0);
alias ParameterTypeTuple!((int a){}) P_dglit;
static assert(P_dglit.length == 1);
static assert(is(P_dglit[0] == int));
}
/**
Returns the number of arguments of function $(D func).
arity is undefined for variadic functions.
Example:
---
void foo(){}
static assert(arity!foo==0);
void bar(uint){}
static assert(arity!bar==1);
---
*/
template arity(alias func)
if ( isCallable!func && variadicFunctionStyle!func == Variadic.no )
{
enum size_t arity = ParameterTypeTuple!func.length;
}
unittest {
void foo(){}
static assert(arity!foo==0);
void bar(uint){}
static assert(arity!bar==1);
void variadicFoo(uint...){}
static assert(__traits(compiles,arity!variadicFoo)==false);
}
/**
Returns a tuple consisting of the storage classes of the parameters of a
function $(D func).
Example:
--------------------
alias ParameterStorageClass STC; // shorten the enum name
void func(ref int ctx, out real result, real param)
{
}
alias ParameterStorageClassTuple!func pstc;
static assert(pstc.length == 3); // three parameters
static assert(pstc[0] == STC.ref_);
static assert(pstc[1] == STC.out_);
static assert(pstc[2] == STC.none);
--------------------
*/
enum ParameterStorageClass : uint
{
/**
* These flags can be bitwise OR-ed together to represent complex storage
* class.
*/
none = 0, /// ditto
scope_ = 0b000_1, /// ditto
out_ = 0b001_0, /// ditto
ref_ = 0b010_0, /// ditto
lazy_ = 0b100_0, /// ditto
}
/// ditto
template ParameterStorageClassTuple(func...)
if (func.length == 1 && isCallable!func)
{
alias Unqual!(FunctionTypeOf!func) Func;
/*
* TypeFuncion:
* CallConvention FuncAttrs Arguments ArgClose Type
*/
alias ParameterTypeTuple!Func Params;
// chop off CallConvention and FuncAttrs
enum margs = demangleFunctionAttributes(mangledName!Func[1 .. $]).rest;
// demangle Arguments and store parameter storage classes in a tuple
template demangleNextParameter(string margs, size_t i = 0)
{
static if (i < Params.length)
{
enum demang = demangleParameterStorageClass(margs);
enum skip = mangledName!(Params[i]).length; // for bypassing Type
enum rest = demang.rest;
alias TypeTuple!(
demang.value + 0, // workaround: "not evaluatable at ..."
demangleNextParameter!(rest[skip .. $], i + 1)
) demangleNextParameter;
}
else // went thru all the parameters
{
alias TypeTuple!() demangleNextParameter;
}
}
alias demangleNextParameter!margs ParameterStorageClassTuple;
}
unittest
{
alias ParameterStorageClass STC;
void noparam() {}
static assert(ParameterStorageClassTuple!noparam.length == 0);
void test(scope int, ref int, out int, lazy int, int) { }
alias ParameterStorageClassTuple!test test_pstc;
static assert(test_pstc.length == 5);
static assert(test_pstc[0] == STC.scope_);
static assert(test_pstc[1] == STC.ref_);
static assert(test_pstc[2] == STC.out_);
static assert(test_pstc[3] == STC.lazy_);
static assert(test_pstc[4] == STC.none);
interface Test
{
void test_const(int) const;
void test_sharedconst(int) shared const;
}
Test testi;
alias ParameterStorageClassTuple!(Test.test_const) test_const_pstc;
static assert(test_const_pstc.length == 1);
static assert(test_const_pstc[0] == STC.none);
alias ParameterStorageClassTuple!(testi.test_sharedconst) test_sharedconst_pstc;
static assert(test_sharedconst_pstc.length == 1);
static assert(test_sharedconst_pstc[0] == STC.none);
alias ParameterStorageClassTuple!((ref int a) {}) dglit_pstc;
static assert(dglit_pstc.length == 1);
static assert(dglit_pstc[0] == STC.ref_);
// Bugzilla 9317
static inout(int) func(inout int param) { return param; }
static assert(ParameterStorageClassTuple!(typeof(func))[0] == STC.none);
}
/**
Get, as a tuple, the identifiers of the parameters to a function symbol.
Example:
---
import std.traits;
int foo(int num, string name);
static assert([ParameterIdentifierTuple!foo] == ["num", "name"]);
---
*/
template ParameterIdentifierTuple(func...)
if (func.length == 1 && isCallable!func)
{
static if (is(typeof(func[0]) PT == __parameters))
{
template Get(size_t i)
{
enum Get = __traits(identifier, PT[i..i+1]);
}
}
else static if (is(FunctionTypeOf!func PT == __parameters))
{
template Get(size_t i)
{
enum Get = "";
}
}
else
{
static assert(0, func[0].stringof ~ "is not a function");
// Define dummy entities to avoid pointless errors
template Get(size_t i) { enum Get = ""; }
alias TypeTuple!() PT;
}
template Impl(size_t i = 0)
{
static if (i == PT.length)
alias TypeTuple!() Impl;
else
alias TypeTuple!(Get!i, Impl!(i+1)) Impl;
}
alias Impl!() ParameterIdentifierTuple;
}
unittest
{
// Test for ddoc example
import std.traits;
int foo(int num, string name);
static assert([ParameterIdentifierTuple!foo] == ["num", "name"]);
}
unittest
{
alias ParameterIdentifierTuple PIT;
void bar(int num, string name, int[] array){}
static assert([PIT!bar] == ["num", "name", "array"]);
// might be changed in the future?
void function(int num, string name) fp;
static assert([PIT!fp] == ["", ""]);
// might be changed in the future?
void delegate(int num, string name, int[long] aa) dg;
static assert([PIT!dg] == ["", "", ""]);
/+
// depends on internal
void baw(int, string, int[]){}
static assert([PIT!baw] == ["_param_0", "_param_1", "_param_2"]);
// depends on internal
void baz(TypeTuple!(int, string, int[]) args){}
static assert([PIT!baz] == ["_param_0", "_param_1", "_param_2"]);
+/
}
/**
Get, as a tuple, the default value of the parameters to a function symbol.
If a parameter doesn't have the default value, $(D void) is returned instead.
Example:
---
import std.traits;
int foo(int num, string name = "hello", int[] arr = [1,2,3]);
static assert(is(ParameterDefaultValueTuple!foo[0] == void));
static assert( ParameterDefaultValueTuple!foo[1] == "hello");
static assert( ParameterDefaultValueTuple!foo[2] == [1,2,3]);
---
*/
template ParameterDefaultValueTuple(func...)
if (func.length == 1 && isCallable!func)
{
static if (is(typeof(func[0]) PT == __parameters))
{
template Get(size_t i)
{
enum get = (PT[i..i+1] args) => args[0];
static if (is(typeof(get())))
enum Get = get();
else
alias void Get;
// If default arg doesn't exist, returns void instead.
}
}
else static if (is(FunctionTypeOf!func PT == __parameters))
{
template Get(size_t i)
{
enum Get = "";
}
}
else
{
static assert(0, func[0].stringof ~ "is not a function");
// Define dummy entities to avoid pointless errors
template Get(size_t i) { enum Get = ""; }
alias TypeTuple!() PT;
}
template Impl(size_t i = 0)
{
static if (i == PT.length)
alias TypeTuple!() Impl;
else
alias TypeTuple!(Get!i, Impl!(i+1)) Impl;
}
alias Impl!() ParameterDefaultValueTuple;
}
unittest
{
// Test for ddoc example
int foo(int num, string name = "hello", int[] arr = [1,2,3]);
static assert(is(ParameterDefaultValueTuple!foo[0] == void));
static assert( ParameterDefaultValueTuple!foo[1] == "hello");
static assert( ParameterDefaultValueTuple!foo[2] == [1,2,3]);
}
unittest
{
alias ParameterDefaultValueTuple PDVT;
void bar(int n = 1, string s = "hello"){}
static assert(PDVT!bar.length == 2);
static assert(PDVT!bar[0] == 1);
static assert(PDVT!bar[1] == "hello");
static assert(is(typeof(PDVT!bar) == typeof(TypeTuple!(1, "hello"))));
void baz(int x, int n = 1, string s = "hello"){}
static assert(PDVT!baz.length == 3);
static assert(is(PDVT!baz[0] == void));
static assert( PDVT!baz[1] == 1);
static assert( PDVT!baz[2] == "hello");
static assert(is(typeof(PDVT!baz) == typeof(TypeTuple!(void, 1, "hello"))));
struct Colour
{
ubyte a,r,g,b;
static immutable Colour white = Colour(255,255,255,255);
}
void bug8106(Colour c = Colour.white){}
//pragma(msg, PDVT!bug8106);
static assert(PDVT!bug8106[0] == Colour.white);
}
/**
Returns the attributes attached to a function $(D func).
Example:
--------------------
alias FunctionAttribute FA; // shorten the enum name
real func(real x) pure nothrow @safe
{
return x;
}
static assert(functionAttributes!func & FA.pure_);
static assert(functionAttributes!func & FA.safe);