Add array_init_test_cx.cpp

test/array_init_test_cx.cpp

@@ -0,0 +1,74 @@
+// Copyright 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/array.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+#include <boost/config/workaround.hpp>
+#include <cstddef>
+
+#if defined(BOOST_NO_CXX11_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE("Test skipped because BOOST_NO_CXX11_CONSTEXPR is defined")
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+template<class T> void test1()
+{
+    constexpr boost::array<T, 1> a = {{}};
+
+    STATIC_ASSERT( a[0] == 0 );
+}
+
+template<class T> void test2()
+{
+    constexpr boost::array<T, 2> a = {};
+
+    STATIC_ASSERT( a[0] == 0 );
+    STATIC_ASSERT( a[1] == 0 );
+}
+
+template<class T> void test3()
+{
+    constexpr boost::array<T, 3> a = {{ 1, 2, 3 }};
+
+    STATIC_ASSERT( a[0] == 1 );
+    STATIC_ASSERT( a[1] == 2 );
+    STATIC_ASSERT( a[2] == 3 );
+}
+
+template<class T> void test4()
+{
+    constexpr boost::array<T, 4> a = { 1, 2, 3, 4 };
+
+    STATIC_ASSERT( a[0] == 1 );
+    STATIC_ASSERT( a[1] == 2 );
+    STATIC_ASSERT( a[2] == 3 );
+    STATIC_ASSERT( a[3] == 4 );
+}
+
+template<class T> void test5()
+{
+    // constexpr boost::array<T, 0> a = {{}};
+}
+
+template<class T> void test6()
+{
+    constexpr boost::array<T, 0> a = {};
+    (void)a;
+}
+
+int main()
+{
+    test1<int>();
+    test2<int>();
+    test3<int>();
+    test4<int>();
+    test5<int>();
+    test6<int>();
+}
+
+#endif