[PATCH] D33340: [libcxx] [test] Add string nullptr asserts to erase functions.

[Billy Robert O'Neal III via Phabricator via cfe-commits]

BillyONeal created this revision.

In my perf overhaul for MSVC++'s basic_string I wrote the null at data[oldsize] instead of data[newsize]; adding asserts to catch that bug.


https://reviews.llvm.org/D33340

Files:
  test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
  test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
  test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
  test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp


Index: test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
===================================================================
--- test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
+++ test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
@@ -29,6 +29,7 @@
     {
         s.erase(pos, n);
         LIBCPP_ASSERT(s.__invariants());
+        assert(s[s.size()] == typename S::value_type());
         assert(s == expected);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
@@ -58,6 +59,7 @@
     {
         s.erase(pos);
         LIBCPP_ASSERT(s.__invariants());
+        assert(s[s.size()] == typename S::value_type());
         assert(s == expected);
     }
 #ifndef TEST_HAS_NO_EXCEPTIONS
@@ -83,6 +85,7 @@
 {
     s.erase();
     LIBCPP_ASSERT(s.__invariants());
+    assert(s[s.size()] == typename S::value_type());
     assert(s == expected);
 }
 
Index: test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
===================================================================
--- test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
+++ test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
@@ -23,6 +23,7 @@
 {
     s.pop_back();
     LIBCPP_ASSERT(s.__invariants());
+    assert(s[s.size()] == typename S::value_type());
     assert(s == expected);
 }
 
Index: test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
===================================================================
--- test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
+++ test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
@@ -25,6 +25,7 @@
     typename S::const_iterator last = s.cbegin() + pos + n;
     typename S::iterator i = s.erase(first, last);
     LIBCPP_ASSERT(s.__invariants());
+    assert(s[s.size()] == typename S::value_type());
     assert(s == expected);
     assert(i - s.begin() == pos);
 }
Index: test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
===================================================================
--- test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
+++ test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
@@ -24,6 +24,7 @@
     typename S::const_iterator p = s.begin() + pos;
     typename S::iterator i = s.erase(p);
     LIBCPP_ASSERT(s.__invariants());
+    assert(s[s.size()] == typename S::value_type());
     assert(s == expected);
     assert(i - s.begin() == pos);
 }


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