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https://github.com/c64scene-ar/llvm-6502.git
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81cf432569
This patch forbids implicit conversion of DenseMap::const_iterator to DenseMap::iterator which was possible because DenseMapIterator inherited (publicly) from DenseMapConstIterator. Conversion the other way around is now allowed as one may expect. The template DenseMapConstIterator is removed and the template parameter IsConst which specifies whether the iterator is constant is added to DenseMapIterator. Actually IsConst parameter is not necessary since the constness can be determined from KeyT but this is not relevant to the fix and can be addressed later. Patch by Victor Zverovich! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86636 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
3.9 KiB
C++
108 lines
3.9 KiB
C++
//===- llvm/Support/type_traits.h - Simplfied type traits -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides a template class that determines if a type is a class or
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// not. The basic mechanism, based on using the pointer to member function of
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// a zero argument to a function was "boosted" from the boost type_traits
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// library. See http://www.boost.org/ for all the gory details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_TYPE_TRAITS_H
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#define LLVM_SUPPORT_TYPE_TRAITS_H
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// This is actually the conforming implementation which works with abstract
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// classes. However, enough compilers have trouble with it that most will use
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// the one in boost/type_traits/object_traits.hpp. This implementation actually
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// works with VC7.0, but other interactions seem to fail when we use it.
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namespace llvm {
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namespace dont_use
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{
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// These two functions should never be used. They are helpers to
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// the is_class template below. They cannot be located inside
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// is_class because doing so causes at least GCC to think that
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// the value of the "value" enumerator is not constant. Placing
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// them out here (for some strange reason) allows the sizeof
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// operator against them to magically be constant. This is
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// important to make the is_class<T>::value idiom zero cost. it
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// evaluates to a constant 1 or 0 depending on whether the
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// parameter T is a class or not (respectively).
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template<typename T> char is_class_helper(void(T::*)());
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template<typename T> double is_class_helper(...);
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}
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template <typename T>
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struct is_class
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{
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// is_class<> metafunction due to Paul Mensonides (leavings@attbi.com). For
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// more details:
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// http://groups.google.com/groups?hl=en&selm=000001c1cc83%24e154d5e0%247772e50c%40c161550a&rnum=1
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public:
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enum { value = sizeof(char) == sizeof(dont_use::is_class_helper<T>(0)) };
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};
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/// \brief Metafunction that determines whether the two given types are
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/// equivalent.
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template<typename T, typename U>
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struct is_same {
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static const bool value = false;
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};
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template<typename T>
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struct is_same<T, T> {
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static const bool value = true;
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};
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// enable_if_c - Enable/disable a template based on a metafunction
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template<bool Cond, typename T = void>
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struct enable_if_c {
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typedef T type;
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};
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template<typename T> struct enable_if_c<false, T> { };
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// enable_if - Enable/disable a template based on a metafunction
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template<typename Cond, typename T = void>
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struct enable_if : public enable_if_c<Cond::value, T> { };
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namespace dont_use {
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template<typename Base> char base_of_helper(const volatile Base*);
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template<typename Base> double base_of_helper(...);
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}
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/// is_base_of - Metafunction to determine whether one type is a base class of
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/// (or identical to) another type.
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template<typename Base, typename Derived>
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struct is_base_of {
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static const bool value
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= is_class<Base>::value && is_class<Derived>::value &&
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sizeof(char) == sizeof(dont_use::base_of_helper<Base>((Derived*)0));
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};
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// remove_pointer - Metafunction to turn Foo* into Foo. Defined in
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// C++0x [meta.trans.ptr].
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template <typename T> struct remove_pointer { typedef T type; };
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template <typename T> struct remove_pointer<T*> { typedef T type; };
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template <typename T> struct remove_pointer<T*const> { typedef T type; };
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template <typename T> struct remove_pointer<T*volatile> { typedef T type; };
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template <typename T> struct remove_pointer<T*const volatile> {
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typedef T type; };
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template <bool, typename T, typename F>
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struct conditional { typedef T type; };
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template <typename T, typename F>
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struct conditional<false, T, F> { typedef F type; };
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}
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#endif
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