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-rw-r--r--core/include/fxcrt/fx_basic.h16
-rw-r--r--core/include/fxcrt/fx_string.h2
2 files changed, 17 insertions, 1 deletions
diff --git a/core/include/fxcrt/fx_basic.h b/core/include/fxcrt/fx_basic.h
index 22ba611a77..98a540c455 100644
--- a/core/include/fxcrt/fx_basic.h
+++ b/core/include/fxcrt/fx_basic.h
@@ -18,6 +18,22 @@
#ifndef _FX_STREAM_H_
#include "fx_stream.h"
#endif
+
+// The FX_ArraySize(arr) macro returns the # of elements in an array arr.
+// The expression is a compile-time constant, and therefore can be
+// used in defining new arrays, for example. If you use FX_ArraySize on
+// a pointer by mistake, you will get a compile-time error.
+//
+// One caveat is that FX_ArraySize() doesn't accept any array of an
+// anonymous type or a type defined inside a function.
+#define FX_ArraySize(array) (sizeof(ArraySizeHelper(array)))
+
+// This template function declaration is used in defining FX_ArraySize.
+// Note that the function doesn't need an implementation, as we only
+// use its type.
+template <typename T, size_t N>
+char (&ArraySizeHelper(T (&array)[N]))[N];
+
class CFX_BinaryBuf : public CFX_Object
{
public:
diff --git a/core/include/fxcrt/fx_string.h b/core/include/fxcrt/fx_string.h
index 47e8ecdf1e..44c6fc53ff 100644
--- a/core/include/fxcrt/fx_string.h
+++ b/core/include/fxcrt/fx_string.h
@@ -597,7 +597,7 @@ private:
}
};
typedef const CFX_WideStringC& FX_WSTR;
-#define FX_WSTRC(wstr) CFX_WideStringC(wstr, sizeof(wstr) / sizeof(FX_WCHAR) - 1)
+#define FX_WSTRC(wstr) CFX_WideStringC(wstr, FX_ArraySize(wstr) - 1)
struct CFX_StringDataW {
long m_nRefs;