262 lines
12 KiB
C++
262 lines
12 KiB
C++
// This file is part of the uSTL library, an STL implementation.
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//
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// Copyright (c) 2007 by Mike Sharov <msharov@users.sourceforge.net>
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//
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// This implementation is adapted from the Loki library, distributed under
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// the MIT license with Copyright (c) 2001 by Andrei Alexandrescu.
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#pragma once
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#include "typelist.h"
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namespace ustl {
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namespace tm {
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//----------------------------------------------------------------------
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// Type classes and type modifiers
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//----------------------------------------------------------------------
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typedef tl::Seq<unsigned char, unsigned short, unsigned, unsigned long>::Type
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StdUnsignedInts;
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typedef tl::Seq<signed char, short, int, long>::Type StdSignedInts;
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typedef tl::Seq<bool, char, wchar_t>::Type StdOtherInts;
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typedef tl::Seq<float, double>::Type StdFloats;
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template <typename U> struct Identity { typedef U Result; };
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template <typename U> struct AddPointer { typedef U* Result; };
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template <typename U> struct AddPointer<U&> { typedef U* Result; };
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template <typename U> struct AddReference { typedef U& Result; };
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template <typename U> struct AddReference<U&> { typedef U& Result; };
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template <> struct AddReference<void> { typedef NullType Result; };
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template <typename U> struct AddParameterType { typedef const U& Result; };
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template <typename U> struct AddParameterType<U&> { typedef U& Result; };
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template <> struct AddParameterType<void> { typedef NullType Result; };
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template <typename U> struct RemoveReference { typedef U Result; };
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template <typename U> struct RemoveReference<U&> { typedef U Result; };
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template <bool, typename T> struct EnableIf { typedef void Result; };
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template <typename T> struct EnableIf<true, T> { typedef T Result; };
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//----------------------------------------------------------------------
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// Function pointer testers
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//----------------------------------------------------------------------
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// Macros expand to numerous parameters
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template <typename T>
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struct IsFunctionPointerRaw { enum { result = false}; };
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template <typename T>
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struct IsMemberFunctionPointerRaw { enum { result = false}; };
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#define TM_FPR_MAXN 9
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#define TM_FPR_TYPE(n) PASTE(T,n)
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#define TM_FPR_TYPENAME(n) typename TM_FPR_TYPE(n)
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// First specialize for regular functions
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template <typename T>
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struct IsFunctionPointerRaw<T(*)(void)>
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{enum {result = true};};
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#define TM_FPR_SPEC(n) \
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template <typename T, COMMA_LIST(n, TM_FPR_TYPENAME)> \
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struct IsFunctionPointerRaw<T(*)(COMMA_LIST(n, TM_FPR_TYPE))> \
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{ enum { result = true }; }
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LIST (TM_FPR_MAXN, TM_FPR_SPEC, ;);
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// Then for those with an ellipsis argument
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template <typename T>
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struct IsFunctionPointerRaw<T(*)(...)>
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{enum {result = true};};
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#define TM_FPR_SPEC_ELLIPSIS(n) \
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template <typename T, COMMA_LIST(n, TM_FPR_TYPENAME)> \
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struct IsFunctionPointerRaw<T(*)(COMMA_LIST(n, TM_FPR_TYPE), ...)> \
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{ enum { result = true }; }
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LIST (TM_FPR_MAXN, TM_FPR_SPEC_ELLIPSIS, ;);
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// Then for member function pointers
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template <typename T, typename S>
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struct IsMemberFunctionPointerRaw<T (S::*)(void)>
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{ enum { result = true }; };
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#define TM_MFPR_SPEC(n) \
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template <typename T, typename S, COMMA_LIST(n, TM_FPR_TYPENAME)> \
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struct IsMemberFunctionPointerRaw<T (S::*)(COMMA_LIST(n, TM_FPR_TYPE))> \
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{ enum { result = true };};
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LIST (TM_FPR_MAXN, TM_MFPR_SPEC, ;);
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// Then for member function pointers with an ellipsis argument
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template <typename T, typename S>
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struct IsMemberFunctionPointerRaw<T (S::*)(...)>
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{ enum { result = true }; };
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#define TM_MFPR_SPEC_ELLIPSIS(n) \
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template <typename T, typename S, COMMA_LIST(n, TM_FPR_TYPENAME)> \
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struct IsMemberFunctionPointerRaw<T (S::*)(COMMA_LIST(n, TM_FPR_TYPE), ...)> \
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{ enum { result = true }; };
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LIST (TM_FPR_MAXN, TM_MFPR_SPEC_ELLIPSIS, ;);
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// Then for const member function pointers (getting tired yet?)
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template <typename T, typename S>
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struct IsMemberFunctionPointerRaw<T (S::*)(void) const>
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{ enum { result = true }; };
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#define TM_CMFPR_SPEC(n) \
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template <typename T, typename S, COMMA_LIST(n, TM_FPR_TYPENAME)> \
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struct IsMemberFunctionPointerRaw<T (S::*)(COMMA_LIST(n, TM_FPR_TYPE)) const> \
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{ enum { result = true };};
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LIST (TM_FPR_MAXN, TM_CMFPR_SPEC, ;);
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// Finally for const member function pointers with an ellipsis argument (whew!)
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template <typename T, typename S>
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struct IsMemberFunctionPointerRaw<T (S::*)(...) const>
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{ enum { result = true }; };
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#define TM_CMFPR_SPEC_ELLIPSIS(n) \
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template <typename T, typename S, COMMA_LIST(n, TM_FPR_TYPENAME)> \
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struct IsMemberFunctionPointerRaw<T (S::*)(COMMA_LIST(n, TM_FPR_TYPE), ...) const> \
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{ enum { result = true }; };
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LIST (TM_FPR_MAXN, TM_CMFPR_SPEC_ELLIPSIS, ;);
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#undef TM_FPR_SPEC
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#undef TM_FPR_SPEC_ELLIPSIS
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#undef TM_MFPR_SPEC
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#undef TM_MFPR_SPEC_ELLIPSIS
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#undef TM_CMFPR_SPEC
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#undef TM_CMFPR_SPEC_ELLIPSIS
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#undef TM_FPR_TYPENAME
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#undef TM_FPR_TYPE
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#undef TM_FPR_MAXN
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//----------------------------------------------------------------------
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// Type traits template
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//----------------------------------------------------------------------
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/// Figures out at compile time various properties of any given type
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/// Invocations (T is a type, TypeTraits<T>::Propertie):
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///
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/// - isPointer : returns true if T is a pointer type
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/// - PointeeType : returns the type to which T points if T is a pointer
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/// type, NullType otherwise
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/// - isReference : returns true if T is a reference type
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/// - isLValue : returns true if T is an lvalue
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/// - isRValue : returns true if T is an rvalue
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/// - ReferredType : returns the type to which T refers if T is a reference
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/// type, NullType otherwise
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/// - isMemberPointer : returns true if T is a pointer to member type
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/// - isStdUnsignedInt: returns true if T is a standard unsigned integral type
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/// - isStdSignedInt : returns true if T is a standard signed integral type
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/// - isStdIntegral : returns true if T is a standard integral type
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/// - isStdFloat : returns true if T is a standard floating-point type
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/// - isStdArith : returns true if T is a standard arithmetic type
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/// - isStdFundamental: returns true if T is a standard fundamental type
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/// - isUnsignedInt : returns true if T is a unsigned integral type
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/// - isSignedInt : returns true if T is a signed integral type
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/// - isIntegral : returns true if T is a integral type
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/// - isFloat : returns true if T is a floating-point type
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/// - isArith : returns true if T is a arithmetic type
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/// - isFundamental : returns true if T is a fundamental type
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/// - ParameterType : returns the optimal type to be used as a parameter for
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/// functions that take Ts
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/// - isConst : returns true if T is a const-qualified type
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/// - NonConstType : Type with removed 'const' qualifier from T, if any
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/// - isVolatile : returns true if T is a volatile-qualified type
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/// - NonVolatileType : Type with removed 'volatile' qualifier from T, if any
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/// - UnqualifiedType : Type with removed 'const' and 'volatile' qualifiers from
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/// T, if any
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/// - ConstParameterType: returns the optimal type to be used as a parameter
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/// for functions that take 'const T's
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///
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template <typename T>
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class TypeTraits {
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private:
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#define TMTT1 template <typename U> struct
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#define TMTT2 template <typename U, typename V> struct
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TMTT1 ReferenceTraits { enum { result = false, lvalue = true, rvalue = false }; typedef U ReferredType; };
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TMTT1 ReferenceTraits<U&> { enum { result = true, lvalue = true, rvalue = false }; typedef U ReferredType; };
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TMTT1 PointerTraits { enum { result = false }; typedef NullType PointeeType; };
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TMTT1 PointerTraits<U*> { enum { result = true }; typedef U PointeeType; };
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TMTT1 PointerTraits<U*&> { enum { result = true }; typedef U PointeeType; };
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TMTT1 PToMTraits { enum { result = false }; };
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TMTT2 PToMTraits<U V::*> { enum { result = true }; };
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TMTT2 PToMTraits<U V::*&> { enum { result = true }; };
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TMTT1 FunctionPointerTraits { enum { result = IsFunctionPointerRaw<U>::result }; };
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TMTT1 PToMFunctionTraits { enum { result = IsMemberFunctionPointerRaw<U>::result }; };
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TMTT1 UnConst { typedef U Result; enum { isConst = false }; };
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TMTT1 UnConst<const U> { typedef U Result; enum { isConst = true }; };
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TMTT1 UnConst<const U&> { typedef U& Result; enum { isConst = true }; };
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TMTT1 UnVolatile { typedef U Result; enum { isVolatile = false }; };
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TMTT1 UnVolatile<volatile U>{ typedef U Result; enum { isVolatile = true }; };
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TMTT1 UnVolatile<volatile U&> {typedef U& Result;enum { isVolatile = true }; };
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#if HAVE_CPP11
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TMTT1 ReferenceTraits<U&&> { enum { result = true, lvalue = false, rvalue = true }; typedef U ReferredType; };
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TMTT1 PointerTraits<U*&&> { enum { result = true }; typedef U PointeeType; };
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TMTT2 PToMTraits<U V::*&&> { enum { result = true }; };
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TMTT1 UnConst<const U&&> { typedef U&& Result; enum { isConst = true }; };
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TMTT1 UnVolatile<volatile U&&> {typedef U&& Result;enum { isVolatile = true }; };
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#endif
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#undef TMTT2
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#undef TMTT1
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public:
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typedef typename UnConst<T>::Result
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NonConstType;
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typedef typename UnVolatile<T>::Result
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NonVolatileType;
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typedef typename UnVolatile<typename UnConst<T>::Result>::Result
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UnqualifiedType;
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typedef typename PointerTraits<UnqualifiedType>::PointeeType
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PointeeType;
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typedef typename ReferenceTraits<T>::ReferredType
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ReferredType;
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enum { isConst = UnConst<T>::isConst };
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enum { isVolatile = UnVolatile<T>::isVolatile };
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enum { isReference = ReferenceTraits<UnqualifiedType>::result };
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enum { isLValue = ReferenceTraits<UnqualifiedType>::lvalue };
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enum { isRValue = ReferenceTraits<UnqualifiedType>::rvalue };
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enum { isFunction = FunctionPointerTraits<typename AddPointer<T>::Result >::result };
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enum { isFunctionPointer = FunctionPointerTraits<
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typename ReferenceTraits<UnqualifiedType>::ReferredType >::result };
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enum { isMemberFunctionPointer= PToMFunctionTraits<
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typename ReferenceTraits<UnqualifiedType>::ReferredType >::result };
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enum { isMemberPointer = PToMTraits<
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typename ReferenceTraits<UnqualifiedType>::ReferredType >::result ||
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isMemberFunctionPointer };
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enum { isPointer = PointerTraits<
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typename ReferenceTraits<UnqualifiedType>::ReferredType >::result ||
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isFunctionPointer };
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enum { isStdUnsignedInt = tl::IndexOf<StdUnsignedInts, UnqualifiedType>::value >= 0 ||
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tl::IndexOf<StdUnsignedInts,
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typename ReferenceTraits<UnqualifiedType>::ReferredType>::value >= 0};
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enum { isStdSignedInt = tl::IndexOf<StdSignedInts, UnqualifiedType>::value >= 0 ||
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tl::IndexOf<StdSignedInts,
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typename ReferenceTraits<UnqualifiedType>::ReferredType>::value >= 0};
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enum { isStdIntegral = isStdUnsignedInt || isStdSignedInt ||
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tl::IndexOf<StdOtherInts, UnqualifiedType>::value >= 0 ||
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tl::IndexOf<StdOtherInts,
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typename ReferenceTraits<UnqualifiedType>::ReferredType>::value >= 0};
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enum { isStdFloat = tl::IndexOf<StdFloats, UnqualifiedType>::value >= 0 ||
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tl::IndexOf<StdFloats,
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typename ReferenceTraits<UnqualifiedType>::ReferredType>::value >= 0};
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enum { isStdArith = isStdIntegral || isStdFloat };
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enum { isStdFundamental = isStdArith || isStdFloat || Conversion<T, void>::sameType };
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enum { isUnsignedInt = isStdUnsignedInt };
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enum { isSignedInt = isStdSignedInt };
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enum { isIntegral = isStdIntegral || isUnsignedInt || isSignedInt };
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enum { isFloat = isStdFloat };
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enum { isArith = isIntegral || isFloat };
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enum { isFundamental = isStdFundamental || isArith };
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typedef typename Select<isStdArith || isPointer || isMemberPointer, T,
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typename AddParameterType<T>::Result>::Result
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ParameterType;
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};
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} // namespace tm
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} // namespace ustl
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