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Give each of Naggy/Nice/StrictMock a base class whose constructor runs before
the mocked class's constructor, and a destructor that runs after the mocked
class's destructor, so that any mock methods run in either the constructor or
destructor use the same strictness as other calls.

PiperOrigin-RevId: 348511612

Add static_asserts that verify that no class hierarchy contains more than one
of {NiceMock, NaggyMock, StrictMock}. This sort of nesting has always been
disallowed, but this CL adds a compile-time check to prevent it.

PiperOrigin-RevId: 347037822

Issue 2135: Change template args in NiceMock, NaggyMock and StrictMock from A1, A2, ... to TArg1, TArg2,... to avoid clash with legacy header files

Get rid of code generation for NiceMock / StrictMock.
They got small enough that it doesn't make sense to generate them.

PiperOrigin-RevId: 226455689

Unifdef c++11-related macros from googletest now that it requires C++11.

PiperOrigin-RevId: 225905601

Applied fixes for ClangTidy modernize-use-override and modernize-use-using.

PiperOrigin-RevId: 223800219

Comments changes, no functionality changes

Formatting changes for automatic code management

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

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).