Fix nullptr support again, remove custom implementation

Author: ianfixes

CHANGELOG.md

@@ -7,14 +7,18 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 ### Added
+- Proper `ostream operator <<` for `nullptr`
+- Proper comparison operations fro `nullptr`
 
 ### Changed
 
 ### Deprecated
 
 ### Removed
+- Homegrown implementation of `nullptr`
 
 ### Fixed
+- `nullptr` support (again)
 
 ### Security
 

SampleProjects/TestSomething/test-something.cpp

@@ -3,3 +3,8 @@ int testSomething(void) {
   millis();  // this line is only here to test that we're able to refer to the builtins
   return 4;
 };
+
+int* aNullPointer(void) {
+  int* ret = nullptr;
+  return ret;
+}

SampleProjects/TestSomething/test-something.h

@@ -1,3 +1,4 @@
 #pragma once
 #include <Arduino.h>
 int testSomething(void);
+int *aNullPointer(void);

SampleProjects/TestSomething/test/library.cpp

@@ -6,4 +6,9 @@ unittest(library_tests_something)
   assertEqual(4, testSomething());
 }
 
+unittest(library_returns_nullptr)
+{
+  assertEqual(nullptr, aNullPointer());
+}
+
 unittest_main()

cpp/arduino/Arduino.h

@@ -15,7 +15,6 @@ Where possible, variable names from the Arduino library are used to avoid confli
 #include "Stream.h"
 #include "HardwareSerial.h"
 #include "SPI.h"
-#include "Nullptr.h"
 
 typedef bool boolean;
 typedef uint8_t byte;

cpp/arduino/Nullptr.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "OstreamHelpers.h"
 #include "Assertion.h"
 #include <iostream>
 using namespace std;

cpp/unittest/ArduinoUnitTests.h

@@ -1,7 +1,6 @@
 #pragma once
 #include <avr/pgmspace.h>
 #include <WString.h>
-#include <Nullptr.h>
 
 template  < typename A, typename B > struct Compare
 {
@@ -899,14 +898,22 @@ template  < size_t N, size_t M > struct Compare<char [N],char [M]>
   } // moreOrEqual
 };
 
-// null pointer comparisons
-template <typename B> int  compareBetween(    const my_nullptr_t &a, const B &b) { return Compare<my_nullptr_t,B>::between(    a, b); }
-template <typename B> bool compareEqual(      const my_nullptr_t &a, const B &b) { return Compare<my_nullptr_t,B>::equal(      a, b); }
-template <typename B> bool compareNotEqual(   const my_nullptr_t &a, const B &b) { return Compare<my_nullptr_t,B>::notEqual(   a, b); }
-template <typename B> bool compareLess(       const my_nullptr_t &a, const B &b) { return Compare<my_nullptr_t,B>::less(       a, b); }
-template <typename B> bool compareMore(       const my_nullptr_t &a, const B &b) { return Compare<my_nullptr_t,B>::more(       a, b); }
-template <typename B> bool compareLessOrEqual(const my_nullptr_t &a, const B &b) { return Compare<my_nullptr_t,B>::lessOrEqual(a, b); }
-template <typename B> bool compareMoreOrEqual(const my_nullptr_t &a, const B &b) { return Compare<my_nullptr_t,B>::moreOrEqual(a, b); }
+// null pointer comparisons to other stuff
+template <typename A> int  compareBetween(    const A &a, const std::nullptr_t &b) { return a ? -1 : 0; }
+template <typename A> bool compareEqual(      const A &a, const std::nullptr_t &b) { return !a; }
+template <typename A> bool compareNotEqual(   const A &a, const std::nullptr_t &b) { return a; }
+template <typename A> bool compareLess(       const A &a, const std::nullptr_t &b) { return false; }
+template <typename A> bool compareMore(       const A &a, const std::nullptr_t &b) { return a; }
+template <typename A> bool compareLessOrEqual(const A &a, const std::nullptr_t &b) { return !a; }
+template <typename A> bool compareMoreOrEqual(const A &a, const std::nullptr_t &b) { return true; }
+
+template <typename B> int  compareBetween(    const std::nullptr_t &a, const B &b) { return b ? 1 : 0; }
+template <typename B> bool compareEqual(      const std::nullptr_t &a, const B &b) { return !b; }
+template <typename B> bool compareNotEqual(   const std::nullptr_t &a, const B &b) { return b; }
+template <typename B> bool compareLess(       const std::nullptr_t &a, const B &b) { return b; }
+template <typename B> bool compareMore(       const std::nullptr_t &a, const B &b) { return false; }
+template <typename B> bool compareLessOrEqual(const std::nullptr_t &a, const B &b) { return true; }
+template <typename B> bool compareMoreOrEqual(const std::nullptr_t &a, const B &b) { return !b; }
 
 // super general comparisons
 template <typename A, typename B> int  compareBetween(    const A &a, const B &b) { return Compare<A,B>::between(    a, b); }

cpp/unittest/Compare.h

@@ -0,0 +1,3 @@
+#pragma once
+
+inline std::ostream& operator << (std::ostream& out, const std::nullptr_t &np) { return out << "nullptr"; }