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Modernize example of combining matchers.

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As of C++14 an ordinary function can have an `auto` return type.

PiperOrigin-RevId: 826617761
Change-Id: I2ceecc8430643c0ac7843fb216b5a117cfe10ab3
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Abseil Team
2025-10-31 13:55:24 -07:00
committed by Copybara-Service
parent 17d335d7c7
commit 6ec14dfd8c
1 changed files with 5 additions and 4 deletions
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9
docs/gmock_cook_book.md
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@@ -900,15 +900,16 @@ using ::testing::Not;
Matchers are function objects, and parametrized matchers can be composed just Matchers are function objects, and parametrized matchers can be composed just
like any other function. However because their types can be long and rarely like any other function. However because their types can be long and rarely
provide meaningful information, it can be easier to express them with C++14 provide meaningful information, it can be easier to express them with template
generic lambdas to avoid specifying types. For example, parameters and `auto`. For example,
```cpp ```cpp
using ::testing::Contains; using ::testing::Contains;
using ::testing::Property; using ::testing::Property;
inline constexpr auto HasFoo = [](const auto& f) { template <typename SubMatcher>
return Property("foo", &MyClass::foo, Contains(f)); inline constexpr auto HasFoo(const SubMatcher& sub_matcher) {
return Property("foo", &MyClass::foo, Contains(sub_matcher));
}; };
... ...
EXPECT_THAT(x, HasFoo("blah")); EXPECT_THAT(x, HasFoo("blah"));