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Document that matcher combinators (&&, ||, !) do not take ownership

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Closes #1781
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Martin Hořeňovský 2019-10-26 21:07:38 +02:00
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docs/matchers.md
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@ -35,6 +35,22 @@ REQUIRE_THAT( str,
(StartsWith( "Big data" ) && !Contains( "web scale" ) ) );
```
_The combining operators do not take ownership of the matcher objects.
This means that if you store the combined object, you have to ensure that
the matcher objects outlive its last use. What this means is that code
like this leads to a use-after-free and (hopefully) a crash:_
```cpp
TEST_CASE("Bugs, bugs, bugs", "[Bug]"){
std::string str = "Bugs as a service";
auto match_expression = Catch::EndsWith( "as a service" ) ||
(Catch::StartsWith( "Big data" ) && !Catch::Contains( "web scale" ) );
REQUIRE_THAT(str, match_expression);
}
```
## Built in matchers
Catch2 provides some matchers by default. They can be found in the
`Catch::Matchers::foo` namespace and are imported into the `Catch`