[CPP-418] Address @geoffw0's review comments.

cpp/ql/src/semmle/code/cpp/Type.qll

@@ -530,7 +530,7 @@ class IntegralType extends ArithmeticType, IntegralOrEnumType {
 
 /**
  * The C/C++ boolean type. See 4.2.  This is the C `_Bool` type
- * or the C++ `bool` type.  For example,
+ * or the C++ `bool` type.  For example:
  * ```
  * extern bool a, b;   // C++
  * _Bool c, d;         // C
@@ -545,7 +545,7 @@ class BoolType extends IntegralType {
 /**
  * The C/C++ character types. See 4.3.  This includes the `char`,
  * `signed char` and `unsigned char` types, all of which are
- * distinct from one another.  For example,
+ * distinct from one another.  For example:
  * ```
  * char a, b;
  * signed char c, d;
@@ -556,7 +556,7 @@ abstract class CharType extends IntegralType { }
 
 /**
  * The C/C++ `char` type (which is distinct from `signed char` and
- * `unsigned char`).  For example,
+ * `unsigned char`).  For example:
  * ```
  * char a, b;
  * ```
@@ -841,8 +841,10 @@ class Char32Type extends IntegralType {
 }
 
 /**
- * The (primitive) type of the C++11 `nullptr` constant. It is the
- * unspeakable type given by `decltype(nullptr)`.
+ * The (primitive) type of the C++11 `nullptr` constant.  It is a
+ * distinct type, denoted by `decltype(nullptr)`, that is not itself a pointer
+ * type or a pointer to member type.  The `<cstddef>` header usually defines
+ * the `std::nullptr_t` type as follows:
  * ```
  * typedef decltype(nullptr) nullptr_t;
  * ```
@@ -857,12 +859,11 @@ class NullPointerType extends BuiltInType {
  * A C/C++ derived type.
  *
  * These are pointer and reference types, array and GNU vector types, and `const` and `volatile` types.
- * In all cases, the type is formed from a single base type.  For example,
+ * In all cases, the type is formed from a single base type.  For example:
  * ```
  * int *pi;
  * int &ri = *pi;
  * const float fa[40];
- * decltype(pi) dpi;
  * ```
  */
 class DerivedType extends Type, @derivedtype {
@@ -908,7 +909,7 @@ class DerivedType extends Type, @derivedtype {
 }
 
 /**
- * An instance of the C++11 `decltype` operator.  For example,
+ * An instance of the C++11 `decltype` operator.  For example:
  * ```
  * int a;
  * decltype(a) b;
@@ -1165,8 +1166,8 @@ class ArrayType extends DerivedType {
  * In both Clang and GNU compilers, vector types can be introduced using the
  * `__attribute__((vector_size(byte_size)))` syntax. The Clang compiler also
  * allows vector types to be introduced using the `ext_vector_type`,
- * `neon_vector_type`, and `neon_polyvector_typ`e attributes (all of which take
- * an element type rather than a byte size).
+ * `neon_vector_type`, and `neon_polyvector_type` attributes (all of which take
+ * an element count rather than a byte size).
  * ```
  * typedef int v4si __attribute__ (( vector_size(4*sizeof(int)) ));
  * v4si v = { 1, 2, 3, 4 };

cpp/ql/src/semmle/code/cpp/exprs/BuiltInOperations.qll

@@ -610,7 +610,7 @@ class BuiltInOperationIsNothrowAssignable extends BuiltInOperation, @isnothrowas
  * The `__is_standard_layout` built-in function (used by some implementations
  * of the `<type_traits>` header).
  *
- * Returns `true` if the type is a primitive type, or a`class`, `struct` or
+ * Returns `true` if the type is a primitive type, or a `class`, `struct` or
  * `union` WITHOUT (1) virtual functions or base classes, (2) reference member
  * variable or (3) multiple occurrences of base `class` objects, among other
  * restrictions.  Please see
@@ -686,8 +686,8 @@ class BuiltInOperationHasTrivialMoveConstructor extends BuiltInOperation,
  * (i.e., can be generated by the compiler).
  * ```
  * template<typename T>
- *   struct is_trivially_assignable
- *   : public integral_constant<bool, __is_trivially_assignable(T) >
+ *   struct has_trivial_move_assign
+ *   : public integral_constant<bool, __has_trivial_move_assign(T) >
  *   { };
  * ```
  */
@@ -721,8 +721,8 @@ class BuiltInOperationHasNothrowMoveAssign extends BuiltInOperation, @hasnothrow
  * (or none).
  * ```
  * template<typename T, typename... Args>
- *   struct is_trivially_constructible
- *   : public integral_constant<bool, __is_trivially_constructible(T) >
+ *   struct is_constructible
+ *   : public integral_constant<bool, __is_constructible(T) >
  *   { };
  * ```
  */
@@ -851,7 +851,7 @@ class BuiltInOperationIsSealed extends BuiltInOperation, @issealedexpr {
  * ref class R {};             // __is_simple_value_class(R) == false
  * value struct V {};          // __is_simple_value_class(V) == true
  * value struct V2 {           // __is_simple_value_class(V2) == false
- *   R ^ r;   // not a simnple value type
+ *   R ^ r;   // not a simple value type
  * };
  * ```
  */
@@ -913,11 +913,6 @@ class BuiltInChooseExpr extends BuiltInOperation, @builtinchooseexpr {
 
 /**
  * Fill operation on a vector. This is a GNU extension.
- * ```
- * typedef float float4 __attribute__((ext_vector_type(4)));
- * float4 v4si = (float4){ 1.0, 2.0, 3.0, 4.0 };
- *
- * ```
  */
 class VectorFillOperation extends UnaryOperation, @vec_fill {
   override string getOperator() { result = "(vector fill)" }