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C++11 code cleanup.

PiperOrigin-RevId: 217364243

Now that googletest has moved to C++11, it should no longer
use NULL or 0 for the null pointer. This patch converts all
such usages to nullptr using clang-tidy.

This prevents LLVM from issuing -Wzero-as-null-pointer-constant
warnings.

PiperOrigin-RevId: 215814400

  - 209457654 Import of OSS PR, https://github.com/google/googletest/pu... by misterg <misterg@google.com>

PiperOrigin-RevId: 209457654

Comments changes, no functionality changes. 

Comments changes, no functionality changes

Formatting changes for automatic code management

Fix warning C4819: The file contains a character that cannot be represented in the current code page (936). Save the file in Unicode format to prevent data loss

merging, 

Internal CL 156157936, which was published in commit
fe402c27, introduced undefined behavior
by casting a base class (internal::{Naggy,Nice,Strict}Base<MockClass>,
using the curiously recurring template pattern) pointer to a derived
class ({Naggy,Nice,Strict}Mock<MockClass>), in the base class'
constructor. At that point, the object isn't guaranteed to have taken on
the shape of the derived class, and casting is undefined behavior.

The undefined behavior was caught by Chrome's CFI build bot [1], and
prevents rolling googletest past that commit / CL.

This commit simplifies the {Naggy,Nice,Strict}Mock class hierarchy in
a way that removes the undefined behavior.

[1] https://www.chromium.org/developers/testing/control-flow-integrity

This merges a Google-internal change (117235625).

Original CL description:
This CL was created manually in about an hour with sed, a Python script
to find all the places unqualified 'string' was mentioned, and some help
from Emacs to add the "std::" qualifications, plus a few manual tweaks.

Pull in gtest 696.

method with no default value is invoked (if exceptions are enabled).

Renames internal enums to the kFoo naming style.

Fixes gmock doctor to work with newer versions of Clang.

Reduced template instantiation depth for the AllOf and AnyOf matchers. Also some formatting changes.

Fixes a lock reentrancy when destroying a mock causes destruction of another mock (issue 79) (by Aaron Jacobs).

Expressed the thread-safety annotations in code, replacing the existing comment-based system (by Aaron Jacobs).

Makes Google Mock compile much faster and use much less memory; reviewed by Nico Weber.  This fixes issue 68.

Picks up gtest r536; renames implicit_cast and down_cast to reduce the chance of clash (by Roman Perepelitsa); enables gmock_gen.py to handle storage specifiers (by Steve Fox).