🏁 try using shared pointers to fix windows compile error

Signed-off-by: burgholzer <[email protected]>

include/mqt-core/parsers/qasm3_parser/Parser.hpp

@@ -29,13 +29,13 @@ namespace qasm3 {
 class MQT_CORE_EXPORT Parser {
   struct ScannerState {
   private:
-    std::unique_ptr<std::istream> is;
+    std::shared_ptr<std::istream> is;
 
   public:
     Token last{0, 0};
     Token t{0, 0};
     Token next{0, 0};
-    std::unique_ptr<Scanner> scanner;
+    std::shared_ptr<Scanner> scanner;
     std::optional<std::string> filename;
     bool isImplicitInclude;
 
@@ -51,17 +51,17 @@ class MQT_CORE_EXPORT Parser {
         std::istream* in,
         std::optional<std::string> debugFilename = std::nullopt,
         const bool implicitInclude = false)
-        : scanner(std::make_unique<Scanner>(in)),
+        : scanner(std::make_shared<Scanner>(in)),
           filename(std::move(debugFilename)),
           isImplicitInclude(implicitInclude) {
       scan();
     }
 
     explicit ScannerState(
-        std::unique_ptr<std::istream> in,
+        std::shared_ptr<std::istream> in,
         std::optional<std::string> debugFilename = std::nullopt,
         const bool implicitInclude = false)
-        : is(std::move(in)), scanner(std::make_unique<Scanner>(is.get())),
+        : is(std::move(in)), scanner(std::make_shared<Scanner>(is.get())),
           filename(std::move(debugFilename)),
           isImplicitInclude(implicitInclude) {
       scan();
@@ -120,7 +120,7 @@ class MQT_CORE_EXPORT Parser {
     scanner.emplace(is);
     scan();
     if (implicitlyIncludeStdgates) {
-      scanner.emplace(std::make_unique<std::istringstream>(STDGATES),
+      scanner.emplace(std::make_shared<std::istringstream>(STDGATES),
                       "stdgates.inc", true);
       scan();
     }