Add wstring_owner, replacing std::wstring.

std::basic_string is nice, but it is not very ergonomic if everything
you really need is to automatically free C strings at end of scope.

I suppose I could have used std::unique_ptr for this, but I suspect
the ergonomics would be worse.

1 files changed, 16 insertions, 1 deletions

diff --git a/c/common.h b/c/common.h
index 8b88635..7b7e996 100644
--- a/c/common.h
+++ b/c/common.h
@@ -11,7 +11,22 @@
 #define WA "A"
 #endif
 
-std::wstring WsFromSz(const char* sz, int iCp = CP_UTF8);
+struct wstring_owner
+{
+	wstring_owner();
+	wstring_owner(wchar_t* wsz);
+	wstring_owner& operator=(wchar_t* wsz);
+	wstring_owner(wstring_owner& wso) = delete;
+	wstring_owner& operator=(wstring_owner& wso) = delete;
+	wstring_owner(wstring_owner&& wso) noexcept;
+	wstring_owner& operator=(wstring_owner&& wso) noexcept;
+	wchar_t *release();
+	operator bool() const;
+	~wstring_owner();
+	wchar_t* p = nullptr;
+};
+
+wstring_owner WsoFromSz(const char* sz, int iCp = CP_UTF8);
 int EBMessageBox(const wchar_t* wszText, const wchar_t* wszCaption, unsigned uType);
 
 struct Win32Error : public std::exception