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More P0202 constexpr work. This commit adds fill/fill_n/generate/generate_n/unique/unique_copy. I removed a specialization of fill_n that recognized when we were dealing with raw pointers and 1 byte trivially-assignable types and did a memset, because the compiler will do that optimization for us.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@323050 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-01-20 20:14:32 +00:00
parent a75d61347e
commit 48a4655868
9 changed files with 173 additions and 44 deletions
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52
include/algorithm
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@@ -219,19 +219,19 @@ template <class InputIterator, class OutputIterator, class Predicate, class T>
replace_copy_if(InputIterator first, InputIterator last, OutputIterator result, Predicate pred, const T& new_value);
template <class ForwardIterator, class T>
void
constexpr void // constexpr in C++20
fill(ForwardIterator first, ForwardIterator last, const T& value);
template <class OutputIterator, class Size, class T>
OutputIterator
constexpr OutputIterator // constexpr in C++20
fill_n(OutputIterator first, Size n, const T& value);
template <class ForwardIterator, class Generator>
void
constexpr void // constexpr in C++20
generate(ForwardIterator first, ForwardIterator last, Generator gen);
template <class OutputIterator, class Size, class Generator>
OutputIterator
constexpr OutputIterator // constexpr in C++20
generate_n(OutputIterator first, Size n, Generator gen);
template <class ForwardIterator, class T>
@@ -2025,7 +2025,7 @@ replace_copy_if(_InputIterator __first, _InputIterator __last, _OutputIterator _
// fill_n
template <class _OutputIterator, class _Size, class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_OutputIterator
__fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_)
{
@@ -2034,24 +2034,8 @@ __fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_)
return __first;
}
template <class _Tp, class _Size, class _Up>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
is_integral<_Tp>::value && sizeof(_Tp) == 1 &&
!is_same<_Tp, bool>::value &&
is_integral<_Up>::value && sizeof(_Up) == 1,
_Tp*
>::type
__fill_n(_Tp* __first, _Size __n,_Up __value_)
{
if (__n > 0)
_VSTD::memset(__first, (unsigned char)__value_, (size_t)(__n));
return __first + __n;
}
template <class _OutputIterator, class _Size, class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_OutputIterator
fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_)
{
@@ -2061,7 +2045,7 @@ fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_)
// fill
template <class _ForwardIterator, class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
void
__fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, forward_iterator_tag)
{
@@ -2070,7 +2054,7 @@ __fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, f
}
template <class _RandomAccessIterator, class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
void
__fill(_RandomAccessIterator __first, _RandomAccessIterator __last, const _Tp& __value_, random_access_iterator_tag)
{
@@ -2078,7 +2062,7 @@ __fill(_RandomAccessIterator __first, _RandomAccessIterator __last, const _Tp& _
}
template <class _ForwardIterator, class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
void
fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_)
{
@@ -2088,7 +2072,7 @@ fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_)
// generate
template <class _ForwardIterator, class _Generator>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
void
generate(_ForwardIterator __first, _ForwardIterator __last, _Generator __gen)
{
@@ -2099,7 +2083,7 @@ generate(_ForwardIterator __first, _ForwardIterator __last, _Generator __gen)
// generate_n
template <class _OutputIterator, class _Size, class _Generator>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_OutputIterator
generate_n(_OutputIterator __first, _Size __orig_n, _Generator __gen)
{
@@ -2194,7 +2178,7 @@ remove_copy_if(_InputIterator __first, _InputIterator __last, _OutputIterator __
// unique
template <class _ForwardIterator, class _BinaryPredicate>
_ForwardIterator
_LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred)
{
__first = _VSTD::adjacent_find<_ForwardIterator, typename add_lvalue_reference<_BinaryPredicate>::type>
@@ -2213,7 +2197,7 @@ unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pre
}
template <class _ForwardIterator>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_ForwardIterator
unique(_ForwardIterator __first, _ForwardIterator __last)
{
@@ -2224,7 +2208,7 @@ unique(_ForwardIterator __first, _ForwardIterator __last)
// unique_copy
template <class _BinaryPredicate, class _InputIterator, class _OutputIterator>
_OutputIterator
_LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
__unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred,
input_iterator_tag, output_iterator_tag)
{
@@ -2247,7 +2231,7 @@ __unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __r
}
template <class _BinaryPredicate, class _ForwardIterator, class _OutputIterator>
_OutputIterator
_LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
__unique_copy(_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __result, _BinaryPredicate __pred,
forward_iterator_tag, output_iterator_tag)
{
@@ -2270,7 +2254,7 @@ __unique_copy(_ForwardIterator __first, _ForwardIterator __last, _OutputIterator
}
template <class _BinaryPredicate, class _InputIterator, class _ForwardIterator>
_ForwardIterator
_LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
__unique_copy(_InputIterator __first, _InputIterator __last, _ForwardIterator __result, _BinaryPredicate __pred,
input_iterator_tag, forward_iterator_tag)
{
@@ -2286,7 +2270,7 @@ __unique_copy(_InputIterator __first, _InputIterator __last, _ForwardIterator __
}
template <class _InputIterator, class _OutputIterator, class _BinaryPredicate>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_OutputIterator
unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred)
{
@@ -2297,7 +2281,7 @@ unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __res
}
template <class _InputIterator, class _OutputIterator>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_OutputIterator
unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result)
{