Refinement

Issue cplusplus#40

functions/defaulted_parameters.md

@@ -12,7 +12,7 @@ Functions in C++ may be overloaded with different numbers and types of parameter
   </thead>
   <tr>
     <td>Foundational knowledge</td>
-    <td>can make calls to functions with defaulted parameters, with or without defaulted parameters</td>
+    <td>can make calls to functions with or without defaulted parameters</td>
   </tr>
   <tr>
     <td>Advanced</td>
@@ -26,19 +26,19 @@ Functions in C++ may be overloaded with different numbers and types of parameter
 
 ## Motivation
 
-Default parameters allow the omission of explicitly stating commonly defined parameters, using sensible defaults. Also allows expansion of function signature without forcing existing consumers to modify their calls.
+Default parameters allow the omission of parameters with obvious or common values. Also may be utilized to extend an existing function signature without forcing changes to existing calling code.
 
 ## Topic introduction
 
-Explains how default parameters work and how to define them.
+Explain how default parameters work and how to define them.
 
 ## Foundational knowledge: Using *
 
 ### Background/Required Knowledge
 
 A student is able to:
 
-* Make calls existing functions using parameters
+* Make calls to existing functions, passing parameters
 * Declare member and non-member functions, separate from definitions
 * Define member and non-member functions
 * Explain what a default constructor is and does
@@ -49,23 +49,19 @@ A student should be able to:
 
 1. Call to a function with a default parameter with or without that parameter specified
 2. Explain what the requirements are for a type to be usable with a default parameter
+3. Explain when the lifetime of a defaulted parameter begins and ends
 
-### Caveats
 
-_This section mentions subtle points to understand, like anything resulting in
-implementation-defined, unspecified, or undefined behavior._
+### Caveats
 
 * When no forward-declaration exists, the definition serves as the declaration
 * When multiple declarations exist, only one may specify the default for any particular parameter, but multiple declarations may specify the defaults for different parameters.
-* Default values may be specified for new parameters in new declarations
+* Additional default values may be specified for other parameters in repeat declarations
 * Calling an overloaded function with fewer parameters may be ambiguous with regard to an overload with defaulted parameters
 
 ### Points to cover
 
-_This section lists important details for each point._
-
-* Default value may only be specified once for each parameter
-* Default values must start from the right
+* Default value may only be specified once for each parameter among all declarations
 
 ## Advanced: implementing *
 
@@ -81,9 +77,11 @@ A student should be able to:
 
 ### Caveats
 
+* Default values must start from the right-most parameter and continue left-ward without gaps
+
 ### Points to cover
 
 ## Further studies
 
-_These are important topics that are not expected to be covered but provide
-guidance where one can continue to investigate this topic in more depth._
+Learning the extent to which you may further specify new default values and rules related to what is necessary for a consumer to take advantage of additionally defaulted values.
+