Merge pull request github#5558 from geoffw0/replace-tostring

Replace toString use

Author: MathiasVP

cpp/ql/src/experimental/Security/CWE/CWE-570/WrongInDetectingAndHandlingMemoryAllocationErrors.ql

@@ -72,9 +72,9 @@ class WrongCheckErrorOperatorNew extends FunctionCall {
   }
 
   /**
-   * Holds if `(std::nothrow)` exists in call `operator new`.
+   * Holds if `(std::nothrow)` or `(std::noexcept)` exists in call `operator new`.
    */
-  predicate isExistsNothrow() { this.getAChild().toString() = "nothrow" }
+  predicate isExistsNothrow() { getTarget().isNoExcept() or getTarget().isNoThrow() }
 }
 
 from WrongCheckErrorOperatorNew op

cpp/ql/test/experimental/query-tests/Security/CWE/CWE-570/semmle/tests/test.cpp

@@ -14,8 +14,8 @@ using namespace std;
 
 void* operator new(std::size_t _Size);
 void* operator new[](std::size_t _Size);
-void* operator new( std::size_t count, const std::nothrow_t& tag );
-void* operator new[]( std::size_t count, const std::nothrow_t& tag );
+void* operator new( std::size_t count, const std::nothrow_t& tag ) noexcept;
+void* operator new[]( std::size_t count, const std::nothrow_t& tag ) noexcept;
 
 void badNew_0_0()
 {