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First part of P1024: Usability Enhancements for std::span. Remove operator() for indexing, and add 'front' and 'back' calls.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@354801 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2019-02-25 17:54:08 +00:00
parent 1c2f15d4c4
commit e5cb744bf1
4 changed files with 175 additions and 15 deletions
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28
include/span
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@@ -88,7 +88,8 @@ public:
// [span.elem], span element access
constexpr reference operator[](index_type idx) const;
constexpr reference operator()(index_type idx) const;
constexpr reference front() const;
constexpr reference back() const;
constexpr pointer data() const noexcept;
// [span.iterators], span iterator support
@@ -319,10 +320,16 @@ public:
return __data[__idx];
}
_LIBCPP_INLINE_VISIBILITY constexpr reference operator()(index_type __idx) const noexcept
_LIBCPP_INLINE_VISIBILITY constexpr reference front() const noexcept
{
_LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T,N>() index out of bounds");
return __data[__idx];
static_assert(_Extent > 0, "span<T,N>[].front() on empty span");
return __data[0];
}
_LIBCPP_INLINE_VISIBILITY constexpr reference back() const noexcept
{
static_assert(_Extent > 0, "span<T,N>[].back() on empty span");
return __data[size()-1];
}
_LIBCPP_INLINE_VISIBILITY constexpr pointer data() const noexcept { return __data; }
@@ -484,12 +491,19 @@ public:
return __data[__idx];
}
_LIBCPP_INLINE_VISIBILITY constexpr reference operator()(index_type __idx) const noexcept
_LIBCPP_INLINE_VISIBILITY constexpr reference front() const noexcept
{
_LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T>() index out of bounds");
return __data[__idx];
_LIBCPP_ASSERT(!empty(), "span<T>[].front() on empty span");
return __data[0];
}
_LIBCPP_INLINE_VISIBILITY constexpr reference back() const noexcept
{
_LIBCPP_ASSERT(!empty(), "span<T>[].back() on empty span");
return __data[size()-1];
}
_LIBCPP_INLINE_VISIBILITY constexpr pointer data() const noexcept { return __data; }
// [span.iter], span iterator support