Fixes #2486. Pointer.elementAt replaced by + operator (#2488)

Fixes #2486. `Pointer.elementAt` replaced by `+` operator. Update pubspec.yaml as well.

Author: sgrekhov

LibTest/ffi/Bool/Bool_A02_t01.dart

@@ -17,7 +17,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Bool> p1 = calloc<Bool>(2);
   try {
-    Expect.equals(1, p1.elementAt(1).address - p1.address);
+    Expect.equals(1, (p1 + 1).address - p1.address);
     Expect.equals(1, sizeOf<Bool>());
   } finally {
     calloc.free(p1);

LibTest/ffi/Char/Char_A02_t01.dart

@@ -23,7 +23,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Char> p1 = calloc<Char>(2);
   try {
-    Expect.equals(1, p1.elementAt(1).address - p1.address);
+    Expect.equals(1, (p1 + 1).address - p1.address);
     Expect.equals(1, sizeOf<Char>());
   } finally {
     calloc.free(p1);

LibTest/ffi/Int/Int_A02_t01.dart

@@ -21,7 +21,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Int> p1 = calloc<Int>(2);
   try {
-    Expect.equals(4, p1.elementAt(1).address - p1.address);
+    Expect.equals(4, (p1 + 1).address - p1.address);
     Expect.equals(4, sizeOf<Int>());
   } finally {
     calloc.free(p1);

LibTest/ffi/Int16/Int16_A02_t01.dart

@@ -15,7 +15,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Int16> p1 = calloc<Int16>(2);
   try {
-    Expect.equals(2, p1.elementAt(1).address - p1.address);
+    Expect.equals(2, (p1 + 1).address - p1.address);
     Expect.equals(2, sizeOf<Int16>());
   } finally {
     calloc.free(p1);

LibTest/ffi/Int32/Int32_A02_t01.dart

@@ -15,7 +15,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Int32> p1 = calloc<Int32>(2);
   try {
-    Expect.equals(4, p1.elementAt(1).address - p1.address);
+    Expect.equals(4, (p1 + 1).address - p1.address);
     Expect.equals(4, sizeOf<Int32>());
   } finally {
     calloc.free(p1);

LibTest/ffi/Int64/Int64_A02_t01.dart

@@ -15,7 +15,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Int64> p1 = calloc<Int64>(2);
   try {
-    Expect.equals(8, p1.elementAt(1).address - p1.address);
+    Expect.equals(8, (p1 + 1).address - p1.address);
     Expect.equals(8, sizeOf<Int64>());
   } finally {
     calloc.free(p1);

LibTest/ffi/Int8/Int8_A02_t01.dart

@@ -15,7 +15,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Int8> p1 = calloc<Int8>(2);
   try {
-    Expect.equals(1, p1.elementAt(1).address - p1.address);
+    Expect.equals(1, (p1 + 1).address - p1.address);
     Expect.equals(1, sizeOf<Int8>());
   } finally {
     calloc.free(p1);

LibTest/ffi/IntPtr/IntPtr_A01_t03.dart

@@ -15,10 +15,10 @@ void main() {
   Pointer<IntPtr> p1 = calloc<IntPtr>(3);
   try {
     if (sizeOf<IntPtr>() == 4) {
-      Expect.equals(4, p1.elementAt(1).address - p1.address);
-      Expect.equals(4, p1.elementAt(2).address - p1.elementAt(1).address);
+      Expect.equals(4, (p1 + 1).address - p1.address);
+      Expect.equals(4, (p1 + 2).address - (p1 + 1).address);
     } else {
-      Expect.equals(8, p1.elementAt(1).address - p1.address);
+      Expect.equals(8, (p1 + 1).address - p1.address);
       Expect.equals(8, sizeOf<IntPtr>());
     }
   } finally {

LibTest/ffi/Long/Long_A02_t01.dart

@@ -22,8 +22,8 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<Long> p1 = calloc<Long>(2);
   try {
-    Expect.isTrue(p1.elementAt(1).address - p1.address == 4 ||
-        p1.elementAt(1).address - p1.address == 8);
+    Expect.isTrue((p1 + 1).address - p1.address == 4 ||
+        (p1 + 1).address - p1.address == 8);
     Expect.isTrue(sizeOf<Long>() == 4 || sizeOf<Long>() == 8);
   } finally {
     calloc.free(p1);

LibTest/ffi/LongLong/LongLong_A02_t01.dart

@@ -22,7 +22,7 @@ import "../../../Utils/expect.dart";
 void main() {
   Pointer<LongLong> p1 = calloc<LongLong>(2);
   try {
-    Expect.equals(8, p1.elementAt(1).address - p1.address);
+    Expect.equals(8, (p1 + 1).address - p1.address);
     Expect.equals(8, sizeOf<LongLong>());
   } finally {
     calloc.free(p1);