Add array_size_test_cx.cpp

test/Jamfile.v2

@@ -50,6 +50,7 @@ run array_get_test.cpp ;
 #
 
 compile array_init_test_cx.cpp ;
+compile array_size_test_cx.cpp ;
 
 #
 

test/array_size_test_cx.cpp

@@ -0,0 +1,64 @@
+// 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, std::size_t N> void test1()
+{
+    constexpr boost::array<T, N> a = {};
+
+    STATIC_ASSERT( a.size() == N );
+    STATIC_ASSERT( a.empty() == (N == 0) );
+    STATIC_ASSERT( a.max_size() == N );
+}
+
+template<class T, std::size_t N> void test2()
+{
+    typedef boost::array<T, N> A;
+
+    STATIC_ASSERT( A().size() == N );
+    STATIC_ASSERT( A().empty() == (N == 0) );
+    STATIC_ASSERT( A().max_size() == N );
+}
+
+// the functions are static, which deviates from the standard
+template<class T, std::size_t N> void test3()
+{
+    typedef boost::array<T, N> A;
+
+    STATIC_ASSERT( A::size() == N );
+    STATIC_ASSERT( A::empty() == (N == 0) );
+    STATIC_ASSERT( A::max_size() == N );
+
+    STATIC_ASSERT( A::static_size == N );
+}
+
+int main()
+{
+    test1<int, 0>();
+    test1<int, 1>();
+    test1<int, 7>();
+
+    test2<int, 0>();
+    test2<int, 1>();
+    test2<int, 7>();
+
+    test3<int, 0>();
+    test3<int, 1>();
+    test3<int, 7>();
+}
+
+#endif