From 5f4ca240b4467dc9327e59fd60aa6c2a883a708f Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@bnl.gov>
Date: Tue, 7 May 2013 16:51:48 -0400
Subject: [PATCH] add ScalarTypeFunc::elementSize

---
 pvDataApp/factory/TypeFunc.cpp | 26 ++++++++++++++++++++++++--
 pvDataApp/pv/pvIntrospect.h    |  3 +++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/pvDataApp/factory/TypeFunc.cpp b/pvDataApp/factory/TypeFunc.cpp
index 2685d3c..0d38b6c 100644
--- a/pvDataApp/factory/TypeFunc.cpp
+++ b/pvDataApp/factory/TypeFunc.cpp
@@ -78,11 +78,33 @@ namespace ScalarTypeFunc {
         *buf += name(scalarType);
     }
 
+    size_t elementSize(ScalarType id)
+    {
+        switch(id) {
+#define OP(ENUM, TYPE) case ENUM: return sizeof(TYPE)
+            OP(pvBoolean, boolean);
+            OP(pvUByte, uint8);
+            OP(pvByte, int8);
+            OP(pvUShort, uint16);
+            OP(pvShort, int16);
+            OP(pvUInt, uint32);
+            OP(pvInt, int32);
+            OP(pvULong, uint64);
+            OP(pvLong, int64);
+            OP(pvFloat, float);
+            OP(pvDouble, double);
+            OP(pvString, String);
+#undef OP
+        default:
+            THROW_EXCEPTION2(std::invalid_argument, "error unknown ScalarType");
+        }
+    }
+
     shared_vector<void> allocArray(ScalarType id, size_t len)
     {
         switch(id) {
-#define OP(ENUM, TYPE) case ENUM: return static_shared_vector_cast<TYPE>(shared_vector<TYPE>(len))
-        OP(pvBoolean, uint8);
+#define OP(ENUM, TYPE) case ENUM: return static_shared_vector_cast<void>(shared_vector<TYPE>(len))
+        OP(pvBoolean, boolean);
         OP(pvUByte, uint8);
         OP(pvByte, int8);
         OP(pvUShort, uint16);
diff --git a/pvDataApp/pv/pvIntrospect.h b/pvDataApp/pv/pvIntrospect.h
index bedd97f..51d1015 100644
--- a/pvDataApp/pv/pvIntrospect.h
+++ b/pvDataApp/pv/pvIntrospect.h
@@ -192,6 +192,9 @@ namespace ScalarTypeFunc {
      * @param  scalarType    The type.
      */
     void toString(StringBuilder builder,ScalarType scalarType);
+
+    //! gives sizeof(T) where T depends on the scalar type id.
+    size_t elementSize(ScalarType id);
 };
 
 /**