forked from mirrors/gecko-dev
e0bdf23b2e
In order to properly disable template functions with `std::enable_if` we need to use the resulting type. This only works if we use a dependent type in the template params, hence the need to shadow the `T` param. Proper usage is now of the form: template<typename Q = T, typename EnableIfChar = CharOnlyT<Q>> Foo(); --HG-- extra : rebase_source : da7855403d9e683d06d3858e26805e9d8e338208
166 lines
5 KiB
C++
166 lines
5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// IWYU pragma: private, include "nsString.h"
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#ifndef nsTDependentSubstring_h
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#define nsTDependentSubstring_h
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#include "nsTSubstring.h"
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#include "nsTLiteralString.h"
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/**
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* nsTDependentSubstring_CharT
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*
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* A string class which wraps an external array of string characters. It
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* is the client code's responsibility to ensure that the external buffer
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* remains valid for a long as the string is alive.
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*
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* NAMES:
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* nsDependentSubstring for wide characters
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* nsDependentCSubstring for narrow characters
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*/
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template <typename T>
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class nsTDependentSubstring : public nsTSubstring<T>
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{
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public:
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typedef nsTDependentSubstring<T> self_type;
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typedef nsTSubstring<T> substring_type;
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typedef typename substring_type::fallible_t fallible_t;
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typedef typename substring_type::char_type char_type;
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typedef typename substring_type::char_traits char_traits;
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typedef typename substring_type::incompatible_char_type incompatible_char_type;
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typedef typename substring_type::substring_tuple_type substring_tuple_type;
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typedef typename substring_type::const_iterator const_iterator;
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typedef typename substring_type::iterator iterator;
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typedef typename substring_type::comparator_type comparator_type;
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typedef typename substring_type::char_iterator char_iterator;
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typedef typename substring_type::const_char_iterator const_char_iterator;
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typedef typename substring_type::index_type index_type;
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typedef typename substring_type::size_type size_type;
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// These are only for internal use within the string classes:
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typedef typename substring_type::DataFlags DataFlags;
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typedef typename substring_type::ClassFlags ClassFlags;
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public:
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void Rebind(const substring_type&, uint32_t aStartPos,
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uint32_t aLength = size_type(-1));
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void Rebind(const char_type* aData, size_type aLength);
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void Rebind(const char_type* aStart, const char_type* aEnd);
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nsTDependentSubstring(const substring_type& aStr, uint32_t aStartPos,
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uint32_t aLength = size_type(-1))
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: substring_type()
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{
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Rebind(aStr, aStartPos, aLength);
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}
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nsTDependentSubstring(const char_type* aData, size_type aLength)
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: substring_type(const_cast<char_type*>(aData), aLength,
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DataFlags(0), ClassFlags(0))
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{
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}
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nsTDependentSubstring(const char_type* aStart, const char_type* aEnd);
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#if defined(MOZ_USE_CHAR16_WRAPPER)
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template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
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nsTDependentSubstring(char16ptr_t aData, size_type aLength)
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: nsTDependentSubstring(static_cast<const char16_t*>(aData), aLength)
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{
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}
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template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
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nsTDependentSubstring(char16ptr_t aStart, char16ptr_t aEnd);
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#endif
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nsTDependentSubstring(const const_iterator& aStart,
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const const_iterator& aEnd);
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// Create a nsTDependentSubstring to be bound later
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nsTDependentSubstring()
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: substring_type()
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{
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}
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// auto-generated copy-constructor OK (XXX really?? what about base class copy-ctor?)
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private:
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// NOT USED
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void operator=(const self_type&); // we're immutable, you can't assign into a substring
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};
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extern template class nsTDependentSubstring<char>;
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extern template class nsTDependentSubstring<char16_t>;
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template <typename T>
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inline const nsTDependentSubstring<T>
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Substring(const nsTSubstring<T>& aStr, uint32_t aStartPos,
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uint32_t aLength = uint32_t(-1))
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{
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return nsTDependentSubstring<T>(aStr, aStartPos, aLength);
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}
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template <typename T>
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inline const nsTDependentSubstring<T>
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Substring(const nsTLiteralString<T>& aStr, uint32_t aStartPos,
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uint32_t aLength = uint32_t(-1))
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{
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return nsTDependentSubstring<T>(aStr, aStartPos, aLength);
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}
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template <typename T>
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inline const nsTDependentSubstring<T>
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Substring(const nsReadingIterator<T>& aStart,
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const nsReadingIterator<T>& aEnd)
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{
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return nsTDependentSubstring<T>(aStart.get(), aEnd.get());
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}
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template <typename T>
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inline const nsTDependentSubstring<T>
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Substring(const T* aData, uint32_t aLength)
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{
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return nsTDependentSubstring<T>(aData, aLength);
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}
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template <typename T>
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const nsTDependentSubstring<T>
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Substring(const T* aStart, const T* aEnd);
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#if defined(MOZ_USE_CHAR16_WRAPPER)
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inline const nsTDependentSubstring<char16_t>
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Substring(char16ptr_t aData, uint32_t aLength);
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const nsTDependentSubstring<char16_t>
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Substring(char16ptr_t aStart, char16ptr_t aEnd);
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#endif
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template <typename T>
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inline const nsTDependentSubstring<T>
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StringHead(const nsTSubstring<T>& aStr, uint32_t aCount)
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{
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return nsTDependentSubstring<T>(aStr, 0, aCount);
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}
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template <typename T>
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inline const nsTDependentSubstring<T>
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StringTail(const nsTSubstring<T>& aStr, uint32_t aCount)
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{
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return nsTDependentSubstring<T>(aStr, aStr.Length() - aCount, aCount);
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}
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#endif
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