Implement <span>. Reviewed as https://reviews.llvm.org/D49338

llvm-svn: 337804

1 files changed, 104 insertions, 0 deletions

diff --git a/libcxx/test/std/containers/views/span.cons/span.fail.cpp b/libcxx/test/std/containers/views/span.cons/span.fail.cpp
new file mode 100644
index 00000000000..1fa71551b49
--- /dev/null
+++ b/libcxx/test/std/containers/views/span.cons/span.fail.cpp
@@ -0,0 +1,104 @@
+// -*- C++ -*-
+//===------------------------------ span ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===---------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 
+
+// <span>
+
+// template<class OtherElementType, ptrdiff_t OtherExtent>
+//    constexpr span(const span<OtherElementType, OtherExtent>& s) noexcept;
+//
+//  Remarks: This constructor shall not participate in overload resolution unless:
+//      Extent == dynamic_extent || Extent == OtherExtent is true, and
+//      OtherElementType(*)[] is convertible to ElementType(*)[].
+
+
+#include <span>
+#include <cassert>
+#include <string>
+
+#include "test_macros.h"
+
+void checkCV ()
+{
+//  std::span<               int>   sp;
+    std::span<const          int>  csp;
+    std::span<      volatile int>  vsp;
+    std::span<const volatile int> cvsp;
+
+//  std::span<               int, 0>   sp0;
+    std::span<const          int, 0>  csp0;
+    std::span<      volatile int, 0>  vsp0;
+    std::span<const volatile int, 0> cvsp0;
+
+//  Try to remove const and/or volatile (dynamic -> dynamic)
+    {
+    std::span<               int> s1{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<               int> s2{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<               int> s3{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+
+    std::span<const          int> s4{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const          int> s5{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+
+    std::span<      volatile int> s6{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
+    std::span<      volatile int> s7{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
+    }
+
+//  Try to remove const and/or volatile (static -> static)
+    {
+    std::span<               int, 0> s1{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+    std::span<               int, 0> s2{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+    std::span<               int, 0> s3{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+
+    std::span<const          int, 0> s4{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+    std::span<const          int, 0> s5{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+
+    std::span<      volatile int, 0> s6{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
+    std::span<      volatile int, 0> s7{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
+    }
+
+//  Try to remove const and/or volatile (static -> dynamic)
+    {
+    std::span<               int> s1{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<               int> s2{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<               int> s3{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+
+    std::span<const          int> s4{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const          int> s5{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+
+    std::span<      volatile int> s6{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
+    std::span<      volatile int> s7{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
+    }
+
+//  Try to remove const and/or volatile (static -> static)
+    {
+    std::span<               int, 0> s1{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+    std::span<               int, 0> s2{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+    std::span<               int, 0> s3{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+
+    std::span<const          int, 0> s4{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+    std::span<const          int, 0> s5{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+
+    std::span<      volatile int, 0> s6{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
+    std::span<      volatile int, 0> s7{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
+    }
+}
+
+int main ()
+{
+    std::span<int>      sp;
+    std::span<int, 0>   sp0;
+
+    std::span<float> s1{sp};    // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
+    std::span<float> s2{sp0};   // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
+    std::span<float, 0> s3{sp}; // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
+    std::span<float, 0> s4{sp0};    // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
+    
+    checkCV();
+}