Merge commit '62e8601919faca57a0fa4be1a910458390450cc9' as 'third_party/variant'

third_party/variant/test/compilation_failure/default_constructor.cpp

@@ -0,0 +1,22 @@
+
+// @EXPECTED: First type in variant must be default constructible to allow default construction of variant
+
+#include <variant.hpp>
+
+// Checks that the first type in a variant must be default constructible to
+// make the variant default constructible.
+
+struct no_def_constructor
+{
+
+    int value;
+
+    no_def_constructor() = delete;
+
+    no_def_constructor(int v) : value(v) {}
+};
+
+int main()
+{
+    mapbox::util::variant<no_def_constructor> x;
+}

third_party/variant/test/compilation_failure/empty_typelist.cpp

@@ -0,0 +1,11 @@
+
+// @EXPECTED: Template parameter type list of variant can not be empty
+
+#include <variant.hpp>
+
+// Empty type list should not work.
+
+int main()
+{
+    mapbox::util::variant<> x;
+}

third_party/variant/test/compilation_failure/equality.cpp

@@ -0,0 +1,11 @@
+
+// @EXPECTED:
+
+#include <variant.hpp>
+
+int main()
+{
+    mapbox::util::variant<int> x;
+    mapbox::util::variant<double> y;
+    x == y;
+}

third_party/variant/test/compilation_failure/get_type.cpp

@@ -0,0 +1,10 @@
+
+// @EXPECTED: enable_if
+
+#include <variant.hpp>
+
+int main()
+{
+    mapbox::util::variant<int, double> x;
+    x.get<std::string>();
+}

third_party/variant/test/compilation_failure/is_type.cpp

@@ -0,0 +1,10 @@
+
+// @EXPECTED: invalid type in T in `is<T>()` for this variant
+
+#include <variant.hpp>
+
+int main()
+{
+    mapbox::util::variant<int, double> x;
+    x.is<std::string>();
+}

third_party/variant/test/compilation_failure/mutating_visitor_on_const.cpp

@@ -0,0 +1,24 @@
+
+// @EXPECTED: const int
+
+#include <variant.hpp>
+
+struct mutating_visitor
+{
+    mutating_visitor(int val)
+        : val_(val) {}
+
+    void operator()(int& val) const
+    {
+        val = val_;
+    }
+
+    int val_;
+};
+
+int main()
+{
+    const mapbox::util::variant<int> var(123);
+    const mutating_visitor visitor(456);
+    mapbox::util::apply_visitor(visitor, var);
+}

third_party/variant/test/compilation_failure/no-reference.cpp

@@ -0,0 +1,9 @@
+
+// @EXPECTED: Variant can not hold reference types
+
+#include <variant.hpp>
+
+int main()
+{
+    mapbox::util::variant<double, int&, long> x{mapbox::util::no_init()};
+}