Add array_fill_test.cpp

test/Jamfile.v2

@@ -39,6 +39,7 @@ run array_reverse_test.cpp ;
 run array_size_test.cpp ;
 run array_access_test.cpp ;
 run array_c_array_test.cpp ;
+run array_fill_test.cpp ;
 
 #
 

test/array_fill_test.cpp

@@ -0,0 +1,57 @@
+// 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/core/lightweight_test.hpp>
+#include <cstddef>
+
+template<class T, std::size_t N> void test()
+{
+    boost::array<T, N> a = {};
+
+    a.fill( 1 );
+
+    for( std::size_t i = 0; i < N; ++i )
+    {
+        BOOST_TEST_EQ( a[i], 1 );
+    }
+}
+
+template<class T> void test2()
+{
+    boost::array<T, 4> a = {{ 1, 2, 3, 4 }};
+
+    a.fill( 5 );
+
+    for( std::size_t i = 0; i < 4; ++i )
+    {
+        BOOST_TEST_EQ( a[i], 5 );
+    }
+}
+
+template<class T> void test3()
+{
+    boost::array<T, 4> a = {{ 1, 2, 3, 4 }};
+
+    // aliasing
+    a.fill( a[ 1 ] );
+
+    for( std::size_t i = 0; i < 4; ++i )
+    {
+        BOOST_TEST_EQ( a[i], 2 );
+    }
+}
+
+int main()
+{
+    test<int, 0>();
+    test<int, 1>();
+    test<int, 7>();
+
+    test2<int>();
+
+    test3<int>();
+
+    return boost::report_errors();
+}