Added StringView<>

inc/hgl/type/StringView.h

@@ -0,0 +1,67 @@
+#pragma once
+
+#include<hgl/type/StrChar.h>
+#include<hgl/Comparator.h>
+
+namespace hgl
+{
+    template<typename T> class StringInstance;
+    template<typename T> class String;
+
+    template<typename T> class StringView:public Comparator<StringView<T>>
+    {
+        T *str_data;
+        int str_length;
+
+    public:
+
+        StringView()
+        {
+            str_data=nullptr;
+            str_length=0;
+        }
+
+        StringView(const T *str,const int len)
+        {
+            str_data=(T *)str;
+            str_length=len;
+        }
+
+        StringView(const T *str)
+        {
+            str_data=(T *)str;
+            str_length=0;
+            if(str_data)
+                str_length=hgl::strlen(str_data);
+        }
+
+        StringView(const StringView<T> &str)
+        {
+            str_data=str.str_data;
+            str_length=str.str_length;
+        }
+
+        StringView(const StringInstance<T> &si)=delete;
+        StringView(const String<T> &s)=delete;
+
+        ~StringView()=default;
+
+        const char *c_str()const{return str_data;}
+        const int length()const{return str_length;}
+        const int GetLength()const{return str_length;}
+
+        const bool IsEmpty()const{return str_data&&str_length>0;}
+        
+        const int compare(const StringView<T> &other)const override
+        {
+            return hgl::strcmp(str_data,str_length,other.str_data,other.str_length);
+        }
+    };//class StringView
+
+    using UTF8StringView=StringView<u8char>;
+    using UTF16StringView=StringView<u16char>;
+    using UTF32StringView=StringView<u32char>;
+
+    using AnsiStringView=StringView<char>;
+    using WideStringView=StringView<wchar_t>;
+}//namespace hgl