CWG1781 Converting from nullptr_t to bool in overload resolution

Also fixes CWG2133.

Author: Dawn Perchik

source/declarations.tex

@@ -4356,6 +4356,11 @@
 If the conversion cannot be done or is
 ambiguous, the initialization is ill-formed.
 \item
+Otherwise, if the initialization is direct-initialization,
+the source type is \tcode{std::nullptr_t}, and
+the destination type is \tcode{bool},
+the initial value of the object being initialized is \tcode{false}.
+\item
 Otherwise, the initial value of the object being initialized is
 the (possibly converted) value of the initializer expression.
 Standard conversions\iref{conv} will be used, if necessary,

source/expressions.tex

@@ -1068,10 +1068,7 @@
 A prvalue of arithmetic, unscoped enumeration, pointer, or pointer-to-member
 type can be converted to a prvalue of type \tcode{bool}. A zero value, null
 pointer value, or null member pointer value is converted to \tcode{false}; any
-other value is converted to \tcode{true}. For
-direct-initialization\iref{dcl.init}, a prvalue of type
-\tcode{std::nullptr_t} can be converted to a prvalue of type
-\tcode{bool}; the resulting value is \tcode{false}.
+other value is converted to \tcode{true}.
 
 \indextext{conversion!standard|)}
 

source/overloading.tex

@@ -2747,8 +2747,7 @@
 
 \begin{itemize}
 \item
-A conversion that does not convert a pointer,
-a pointer to member, or \tcode{std::nullptr_t}
+A conversion that does not convert a pointer or a pointer to member
 to
 \tcode{bool}
 is better than one that does.