C++: Make function models private (except ones we anticipate users accessing).

Author: geoffw0

cpp/ql/src/semmle/code/cpp/models/implementations/StdPair.qll

@@ -7,7 +7,7 @@ import semmle.code.cpp.models.interfaces.Taint
 /**
  * Additional model for `std::pair` constructors.
  */
-class StdPairConstructor extends Constructor, TaintFunction {
+private class StdPairConstructor extends Constructor, TaintFunction {
   StdPairConstructor() { this.hasQualifiedName("std", "pair", "pair") }
 
   /**
@@ -34,7 +34,7 @@ class StdPairConstructor extends Constructor, TaintFunction {
 /**
  * The standard pair `swap` function.
  */
-class StdPairSwap extends TaintFunction {
+private class StdPairSwap extends TaintFunction {
   StdPairSwap() { this.hasQualifiedName("std", "pair", "swap") }
 
   override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {