From abf7a2bee69142d4fe5272e1569dea4f70455702 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Wed, 23 Mar 2016 11:44:00 -0400
Subject: research/oop.txt: New file

---
diff --git a/research/oop.txt b/research/oop.txt
new file mode 100644
index 0000000..a23546c
--- /dev/null
+++ b/research/oop.txt
@@ -0,0 +1,135 @@
+Class member declarations
+=========================
+
+Public member declaration
+-------------------------
+
+Public static member declaration
+--------------------------------
+
+Private member declaration
+--------------------------
+
+Private static member declaration
+---------------------------------
+
+Object Member Access Operations
+===============================
+
+Lvalue Assignment
+-----------------
+
+Implementation:
+
+    # High level
+    array_set ${obj} mbr ${val}
+    # Low level
+    eval __arr_${obj}_mbr'=${val}'
+
+Syntax:
+
+    obj->mbr=${val}
+
+Explanation:
+
+`->` dereferences/expands `obj` and accesses the `mbr` lvalue, as in the
+following (unsupported) syntax: `${obj}.mbr=${val}`.
+
+Rvalue Expansion
+----------------
+
+Implementation:
+
+    # High level
+    array_get ${obj} mbr
+    val=${retval}
+    # Low level
+    eval 'val=${'__arr_${obj}_mbr'}'
+
+Syntax:
+
+    val=${obj->mbr}
+
+Explanation:
+
+`->` dereferences/expands `obj` and accesses `mbr`, then `${...}` expands its
+rvalue, as in the following (unsupported) syntax: `val=${${obj}.mbr}`.
+
+Rvalue Call
+-----------
+
+Implementation:
+
+    # High level
+    array_get ${obj} mbr
+    ${retval}
+    # Low level
+    eval "\${__arr_${obj}_mbr} ${obj}" 'arg'
+
+Syntax:
+
+    ${obj->mbr} arg
+
+Explanation:
+
+`->` dereferences/expands `obj` and accesses `mbr`, then `${...}` expands its
+rvalue, as in the following (unsupported) syntax: `${${obj}.mbr}`.
+
+Class Member Access Operations
+==============================
+
+Lvalue Assignment
+-----------------
+
+Implementation:
+
+    # High level
+    array_set Cls mbr ${val}
+    # Low level
+    eval __arr_Cls_mbr'=${val}'
+
+Syntax:
+
+    Cls::mbr=${val}
+
+Explanation:
+
+`::` accesses the `mbr` lvalue of `Cls`.
+
+Rvalue Expansion
+----------------
+
+Implementation:
+
+    # High level
+    array_get ${Cls} mbr
+    val=${retval}
+    # Low level
+    eval 'val=${'__arr_Cls_mbr'}'
+
+Syntax:
+
+    val=${Cls::mbr}
+
+Explanation:
+
+`::` accesses the `mbr` member of `Cls`, then `${...}` expands its rvalue.
+
+Rvalue Call
+-----------
+
+Implementation:
+
+    # High level
+    array_get ${Cls} mbr
+    ${retval}
+    # Low level
+    eval "\${__arr_Cls_mbr} Cls" 'arg'
+
+Syntax:
+
+    ${Cls::mbr}
+
+Explanation:
+
+`::` accesses the `mbr` member of `Cls`, then `${...}` expands its rvalue.
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