Refs #21362. Leave implementation in header.

Signed-off-by: Miguel Company <[email protected]>

include/fastcdr/Cdr.h

@@ -705,9 +705,26 @@ class Cdr
      * @exception exception::NotEnoughMemoryException This exception is thrown when trying to serialize a position that exceeds the internal memory size.
      * @exception exception::BadParamException This exception is thrown when trying to serialize a string with null characters.
      */
-    TEMPLATE_SPEC Cdr_DllAPI
+    TEMPLATE_SPEC
     Cdr& serialize(
-            const std::string& string_t);
+            const std::string& string_t)
+    {
+        // An empty string is serialized as a 0 length string.
+        if (string_t.empty())
+        {
+            return serialize(static_cast<uint32_t>(0));
+        }
+
+        // Check there are no null characters in the string.
+        const char* c_str = string_t.c_str();
+        const auto str_len = strlen(c_str);
+        if (string_t.size() > str_len)
+        {
+            throw BadParamException("The string contains null characters");
+        }
+
+        return serialize_sequence(c_str, str_len + 1);
+    }
 
     /*!
      * @brief This function serializes a std::wstring.

src/cpp/Cdr.cpp

@@ -887,27 +887,6 @@ Cdr& Cdr::serialize(
     return *this;
 }
 
-TEMPLATE_SPEC
-Cdr& Cdr::serialize(
-        const std::string& string_t)
-{
-    // An empty string is serialized as a 0 length string.
-    if (string_t.empty())
-    {
-        return serialize(static_cast<uint32_t>(0));
-    }
-
-    // Check there are no null characters in the string.
-    const char* c_str = string_t.c_str();
-    const auto str_len = strlen(c_str);
-    if (string_t.size() > str_len)
-    {
-        throw BadParamException("The string contains null characters");
-    }
-
-    return serialize_sequence(c_str, str_len + 1);
-}
-
 Cdr& Cdr::serialize_array(
         const bool* bool_t,
         size_t num_elements)