fix #564: Do not use utf8cpp functions in value.h

Author: adazem009

include/scratchcpp/value.h

@@ -8,7 +8,6 @@
 #include <ctgmath>
 #include <cassert>
 #include <iomanip>
-#include <utf8.h>
 #include <iostream>
 #include <clocale>
 
@@ -370,7 +369,7 @@ class LIBSCRATCHCPP_EXPORT Value
         };
 
         /*! Returns the UTF-16 representation of the value. */
-        std::u16string toUtf16() const { return utf8::utf8to16(toString()); };
+        std::u16string toUtf16() const;
 
         /*! Adds the given value to the value. */
         void add(const Value &v)

src/engine/virtualmachine_p.cpp

@@ -6,6 +6,7 @@
 #include <scratchcpp/list.h>
 #include <iostream>
 #include <cassert>
+#include <utf8.h>
 
 #include "virtualmachine_p.h"
 #include "internal/randomgenerator.h"

src/scratch/CMakeLists.txt

@@ -1,5 +1,6 @@
 target_sources(scratchcpp
   PRIVATE
+    value.cpp
     target.cpp
     target_p.cpp
     target_p.h

src/scratch/value.cpp

@@ -0,0 +1,9 @@
+#include <scratchcpp/value.h>
+#include <utf8.h>
+
+using namespace libscratchcpp;
+
+std::u16string Value::toUtf16() const
+{
+    return utf8::utf8to16(toString());
+}

test/scratch_classes/value_test.cpp

@@ -1,4 +1,5 @@
 #include <scratchcpp/value.h>
+#include <utf8.h>
 
 #include "../common.h"