Small overhaul using string_view

luprex/core/cpp/streambuffer.hpp

@@ -269,6 +269,9 @@ public:
     // Get a pointer to the data.
     const char *data() const;
     
+    // Get entire contents as a string_view
+    std::string_view view() const;
+
     // Discard all data.  Reset total read and write counts.
     // Frees up as much space as possible.
     void clear();
@@ -284,7 +287,7 @@ public:
     // It just writes the bytes.
     //
     void write_bytes(const char *bytes, int64_t len);
-    void write_bytes(const eng::string &bytes);
+    void write_bytes(std::string_view bytes);
     
     // Read a block of bytes from the buffer.
     //
@@ -333,7 +336,7 @@ public:
     //
     void write_bool(bool b) { write_int8(b ? 1 : 0); }
     void write_hashvalue(const util::HashValue &hv);
-    void write_string(const eng::string &s);
+    void write_string(std::string_view s);
 
     // Read other types from the buffer.
     //