C++: Introduce 'getAnElementExpr' and 'getAnExpr'.

Author: MathiasVP

cpp/ql/lib/semmle/code/cpp/exprs/Literal.qll

@@ -187,8 +187,22 @@ class ClassAggregateLiteral extends AggregateLiteral {
   override string getAPrimaryQlClass() { result = "ClassAggregateLiteral" }
 
   /**
+   * Gets an expression within the aggregate literal that is used to initialize
+   * field `field`, if present.
+   *
+   * This predicate may have multiple results since a field can be initialized
+   * multiple times in the same initializer.
+   */
+  Expr getAFieldExpr(Field field) { result = this.getFieldExpr(field, _) }
+
+  /**
+   * DEPRECATED: Use `getAFieldExpr` instead.
+   *
    * Gets the expression within the aggregate literal that is used to initialize
    * field `field`, if present.
+   *
+   * This predicate may have multiple results since a field can be initialized
+   * multiple times in the same initializer.
    */
   Expr getFieldExpr(Field field) { result = this.getFieldExpr(field, _) }
 
@@ -274,8 +288,22 @@ class ArrayOrVectorAggregateLiteral extends AggregateLiteral {
   Type getElementType() { none() }
 
   /**
+   * Gets an expression within the aggregate literal that is used to initialize
+   * element `elementIndex`, if present.
+   *
+   * This predicate may have multiple results since an element can be initialized
+   * multiple times in the same initializer.
+   */
+  Expr getAnElementExpr(int elementIndex) { result = this.getElementExpr(elementIndex, _) }
+
+  /**
+   * DEPRECATED: Use `getAnElementExpr` instead.
+   *
    * Gets the expression within the aggregate literal that is used to initialize
    * element `elementIndex`, if present.
+   *
+   * This predicate may have multiple results since an element can be initialized
+   * multiple times in the same initializer.
    */
   Expr getElementExpr(int elementIndex) { result = this.getElementExpr(elementIndex, _) }