feat add string_view

CMakeLists.txt

@@ -191,6 +191,8 @@ if(SLED_BUILD_TESTS)
                 src/sled/debugging/symbolize_test.cc NO_MAIN)
   sled_add_test(NAME sled_sigslot_test SRCS src/sled/sigslot_test.cc)
   sled_add_test(NAME sled_rpc_test SRCS src/sled/network/rpc_test.cc)
+  sled_add_test(NAME sled_string_view_test SRCS
+                src/sled/nonstd/string_view_test.cc)
 endif(SLED_BUILD_TESTS)
 
 if(SLED_BUILD_FUZZ)

src/sled/nonstd/string_view_test.cc

@@ -0,0 +1,59 @@
+#include <sled/nonstd/string_view.h>
+
+using namespace sled;
+using size_type = size_t;
+
+TEST_SUITE("string_view")
+{
+    TEST_CASE("string_view: Allows to default construct an empty string_view")
+    {
+        string_view sv;
+
+        // use parenthesis with data() to prevent lest from using sv.data() as C-string:
+
+        CHECK(sv.size() == size_type(0));
+        CHECK((sv.data() == nssv_nullptr));
+    }
+
+    TEST_CASE("string_view: Allows to construct from pointer and size")
+    {
+        string_view sv("hello world", 5);
+
+        CHECK(sv.size() == size_type(5));
+        CHECK(*(sv.data() + 0) == 'h');
+        CHECK(*(sv.data() + 4) == 'o');
+    }
+
+    TEST_CASE("string_view: Allows to construct from C-string")
+    {
+        string_view sv("hello world");
+
+        CHECK(sv.size() == size_type(11));
+        CHECK(*(sv.data() + 0) == 'h');
+        CHECK(*(sv.data() + 10) == 'd');
+    }
+
+    TEST_CASE("string_view: Allows to copy-construct from empty string_view")
+    {
+        string_view sv1;
+
+        string_view sv2(sv1);
+
+        // use parenthesis with data() to prevent lest from using sv.data() as C-string:
+
+        CHECK(sv2.size() == size_type(0));
+        CHECK((sv2.data() == nssv_nullptr));
+    }
+
+    TEST_CASE("string_view: Allows to copy-construct from non-empty string_view")
+    {
+        string_view sv1("hello world", 5);
+
+        string_view sv2(sv1);
+
+        CHECK(sv2.size() == sv1.size());
+        CHECK((sv2.data() == sv1.data()));
+        CHECK(*(sv2.data() + 0) == 'h');
+        CHECK(*(sv2.data() + 4) == 'o');
+    }
+}

src/sled/sled.h

@@ -3,9 +3,10 @@
 #define SLED_SLED_H
 
 // thrid_party
-#include "async/async.h"
 #include "inja.hpp"
 #include "rx.h"
+#include "sled/async/async.h"
+#include "sled/nonstd/string_view.h"
 #include "toml.hpp"
 
 // experimental
@@ -22,7 +23,7 @@
 // #include "sled/futures/promise.h"
 
 // lang
-#include "lang/attributes.h"
+#include "sled/lang/attributes.h"
 
 // log
 #include "sled/log/log.h"