update examples to use new ctor style

examples/format.cc

@@ -72,12 +72,12 @@ int main() {
     writefln("[ %#(<%d|%f|%s>%|, %) ]", xt);
 
     /* custom format */
-    writefln("%s", Foo());
-    writefln("%i", Foo());
+    writefln("%s", Foo{});
+    writefln("%i", Foo{});
 
     /* custom format via method */
-    writefln("%s", Bar());
-    writefln("%i", Bar());
+    writefln("%s", Bar{});
+    writefln("%i", Bar{});
 
     /* format into string */
     auto s = appender<String>();

examples/listdir.cc

@@ -4,7 +4,7 @@
 using namespace ostd;
 
 void list_dirs(ConstCharRange path, int off = 0) {
-    DirectoryStream ds(path);
+    DirectoryStream ds{path};
     /* iterate all items in directory */
     for (auto v: ds.iter()) {
         if (v.type() != FileType::directory)

examples/stream1.cc

@@ -8,11 +8,11 @@ void print_result(Uint32 x) {
 }
 
 int main() {
-    FileStream wtest("test.bin", StreamMode::write);
+    FileStream wtest{"test.bin", StreamMode::write};
     copy(iter({ 0xABCD1214, 0xBADC3264, 0xDEADBEEF, 0xBEEFDEAD }), wtest.iter<Uint32>());
     wtest.close();
 
-    FileStream rtest("test.bin");
+    FileStream rtest{"test.bin"};
     writefln("stream size: %d", rtest.size());
 
     for (Uint32 x: map(rtest.iter<Uint32>(), FromBigEndian<Uint32>()))

examples/stream2.cc

@@ -7,7 +7,7 @@ using namespace ostd;
 int main() {
     writeln("writing sample file...");
 
-    FileStream wtest("test.txt", StreamMode::write);
+    FileStream wtest{"test.txt", StreamMode::write};
 
     String smpl = "This is a test file for later read.\n"
                   "It contains some sample text in order to see whether "
@@ -19,18 +19,18 @@ int main() {
     copy(smpl.iter(), wtest.iter());
     wtest.close();
 
-    FileStream test("test.txt");
+    FileStream test{"test.txt"};
 
     writeln("## WHOLE FILE READ ##\n");
 
-    String ts1(test.iter());
+    String ts1{test.iter()};
     writefln("-- str beg --\n%s-- str end --", ts1);
 
     test.seek(0);
 
     writeln("\n## PART FILE READ ##\n");
 
-    String ts2(test.iter().take(25));
+    String ts2{test.iter().take(25)};
     writefln("-- str beg --\n%s\n-- str end --", ts2);
 
     return 0;