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Apply constexpr to initializer_list for c++1y.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189271 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2013-08-26 20:11:32 +00:00
parent bce2a4752a
commit e1c5f9ec1b
4 changed files with 66 additions and 10 deletions
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33
include/initializer_list
View File

@ -29,15 +29,15 @@ public:
typedef const E* iterator;
typedef const E* const_iterator;
initializer_list() noexcept;
initializer_list() noexcept; // constexpr in C++14
size_t size() const noexcept;
const E* begin() const noexcept;
const E* end() const noexcept;
size_t size() const noexcept; // constexpr in C++14
const E* begin() const noexcept; // constexpr in C++14
const E* end() const noexcept; // constexpr in C++14
};
template<class E> const E* begin(initializer_list<E> il) noexcept;
template<class E> const E* end(initializer_list<E> il) noexcept;
template<class E> const E* begin(initializer_list<E> il) noexcept; // constexpr in C++14
template<class E> const E* end(initializer_list<E> il) noexcept; // constexpr in C++14
} // std
@ -62,6 +62,7 @@ class _LIBCPP_TYPE_VIS_ONLY initializer_list
size_t __size_;
_LIBCPP_ALWAYS_INLINE
_LIBCPP_CONSTEXPR_AFTER_CXX11
initializer_list(const _Ep* __b, size_t __s) _NOEXCEPT
: __begin_(__b),
__size_(__s)
@ -75,15 +76,26 @@ public:
typedef const _Ep* iterator;
typedef const _Ep* const_iterator;
_LIBCPP_ALWAYS_INLINE initializer_list() _NOEXCEPT : __begin_(nullptr), __size_(0) {}
_LIBCPP_ALWAYS_INLINE
_LIBCPP_CONSTEXPR_AFTER_CXX11
initializer_list() _NOEXCEPT : __begin_(nullptr), __size_(0) {}
_LIBCPP_ALWAYS_INLINE size_t size() const _NOEXCEPT {return __size_;}
_LIBCPP_ALWAYS_INLINE const _Ep* begin() const _NOEXCEPT {return __begin_;}
_LIBCPP_ALWAYS_INLINE const _Ep* end() const _NOEXCEPT {return __begin_ + __size_;}
_LIBCPP_ALWAYS_INLINE
_LIBCPP_CONSTEXPR_AFTER_CXX11
size_t size() const _NOEXCEPT {return __size_;}
_LIBCPP_ALWAYS_INLINE
_LIBCPP_CONSTEXPR_AFTER_CXX11
const _Ep* begin() const _NOEXCEPT {return __begin_;}
_LIBCPP_ALWAYS_INLINE
_LIBCPP_CONSTEXPR_AFTER_CXX11
const _Ep* end() const _NOEXCEPT {return __begin_ + __size_;}
};
template<class _Ep>
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR_AFTER_CXX11
const _Ep*
begin(initializer_list<_Ep> __il) _NOEXCEPT
{
@ -92,6 +104,7 @@ begin(initializer_list<_Ep> __il) _NOEXCEPT
template<class _Ep>
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR_AFTER_CXX11
const _Ep*
end(initializer_list<_Ep> __il) _NOEXCEPT
{

20
test/language.support/support.initlist/support.initlist.access/access.pass.cpp
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@ -32,6 +32,23 @@ struct A
}
};
#if _LIBCPP_STD_VER > 11
struct B
{
constexpr B(std::initializer_list<int> il)
{
const int* b = il.begin();
const int* e = il.end();
assert(il.size() == 3);
assert(e - b == il.size());
assert(*b++ == 3);
assert(*b++ == 2);
assert(*b++ == 1);
}
};
#endif // _LIBCPP_STD_VER > 11
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
int main()
@ -39,4 +56,7 @@ int main()
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
A test1 = {3, 2, 1};
#endif
#if _LIBCPP_STD_VER > 11
constexpr B test2 = {3, 2, 1};
#endif // _LIBCPP_STD_VER > 11
}

4
test/language.support/support.initlist/support.initlist.cons/default.pass.cpp
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@ -22,4 +22,8 @@ int main()
std::initializer_list<A> il;
assert(il.size() == 0);
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
#if _LIBCPP_STD_VER > 11
constexpr std::initializer_list<A> il2;
static_assert(il2.size() == 0, "");
#endif // _LIBCPP_STD_VER > 11
}

19
test/language.support/support.initlist/support.initlist.range/begin_end.pass.cpp
View File

@ -30,6 +30,22 @@ struct A
}
};
#if _LIBCPP_STD_VER > 11
struct B
{
constexpr B(std::initializer_list<int> il)
{
const int* b = begin(il);
const int* e = end(il);
assert(il.size() == 3);
assert(e - b == il.size());
assert(*b++ == 3);
assert(*b++ == 2);
assert(*b++ == 1);
}
};
#endif // _LIBCPP_STD_VER > 11
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
int main()
@ -37,4 +53,7 @@ int main()
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
A test1 = {3, 2, 1};
#endif
#if _LIBCPP_STD_VER > 11
constexpr B test2 = {3, 2, 1};
#endif // _LIBCPP_STD_VER > 11
}