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Given that in the 2 or so years that matchers are thing nobody complained, it seems that people do not actually write this sort of code, and the possibility will be removed in v3. However, to avoid correctness bugs, we will have to support this weird code in v2.
138 lines
4.4 KiB
Markdown
138 lines
4.4 KiB
Markdown
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# Deprecations and incoming changes
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This page documents current deprecations and upcoming planned changes
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inside Catch2. The difference between these is that a deprecated feature
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will be removed, while a planned change to a feature means that the
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feature will behave differently, but will still be present. Obviously,
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either of these is a breaking change, and thus will not happen until
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at least the next major release.
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## Deprecations
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### `--list-*` return values
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The return codes of the `--list-*` family of command line arguments
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will no longer be equal to the number of tests/tags/etc found, instead
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it will be 0 for success and non-zero for failure.
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### `--list-test-names-only`
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`--list-test-names-only` command line argument will be removed.
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### `ANON_TEST_CASE`
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`ANON_TEST_CASE` is scheduled for removal, as it can be fully replaced
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by a `TEST_CASE` with no arguments.
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### Secondary description amongst tags
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Currently, the tags part of `TEST_CASE` (and others) macro can also
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contain text that is not part of tags. This text is then separated into
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a "description" of the test case, but the description is then never used
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apart from writing it out for `--list-tests -v high`.
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Because it isn't actually used nor documented, and brings complications
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to Catch2's internals, description support will be removed.
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### SourceLineInfo::empty()
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There should be no reason to ever have an empty `SourceLineInfo`, so the
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method will be removed.
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### Composing lvalues of already composed matchers
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Because a significant bug in this use case has persisted for 2+ years
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without a bug report, and to simplify the implementation, code that
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composes lvalues of composed matchers will not compile. That is,
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this code will no longer work:
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```cpp
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auto m1 = Contains("string");
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auto m2 = Contains("random");
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auto composed1 = m1 || m2;
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auto m3 = Contains("different");
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auto composed2 = composed1 || m3;
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REQUIRE_THAT(foo(), !composed1);
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REQUIRE_THAT(foo(), composed2);
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```
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Instead you will have to write this:
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```cpp
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auto m1 = Contains("string");
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auto m2 = Contains("random");
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auto m3 = Contains("different");
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REQUIRE_THAT(foo(), !(m1 || m2));
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REQUIRE_THAT(foo(), m1 || m2 || m3);
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```
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## Planned changes
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### Reporter verbosities
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The current implementation of verbosities, where the reporter is checked
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up-front whether it supports the requested verbosity, is fundamentally
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misguided and will be changed. The new implementation will no longer check
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whether the specified reporter supports the requested verbosity, instead
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it will be up to the reporters to deal with verbosities as they see fit
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(with an expectation that unsupported verbosities will be, at most,
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warnings, but not errors).
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### Output format of `--list-*` command line parameters
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The various list operations will be piped through reporters. This means
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that e.g. XML reporter will write the output as machine-parseable XML,
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while the Console reporter will keep the current, human-oriented output.
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### `CHECKED_IF` and `CHECKED_ELSE`
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To make the `CHECKED_IF` and `CHECKED_ELSE` macros more useful, they will
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be marked as "OK to fail" (`Catch::ResultDisposition::SuppressFail` flag
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will be added), which means that their failure will not fail the test,
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making the `else` actually useful.
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### Change semantics of `[.]` and tag exclusion
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Currently, given these 2 tests
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```cpp
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TEST_CASE("A", "[.][foo]") {}
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TEST_CASE("B", "[.][bar]") {}
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```
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specifying `[foo]` as the testspec will run test "A" and specifying
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`~[foo]` will run test "B", even though it is hidden. Also, specifying
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`~[baz]` will run both tests. This behaviour is often surprising and will
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be changed so that hidden tests are included in a run only if they
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positively match a testspec.
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### Console Colour API
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The API for Catch2's console colour will be changed to take an extra
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argument, the stream to which the colour code should be applied.
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### Type erasure in the `PredicateMatcher`
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Currently, the `PredicateMatcher` uses `std::function` for type erasure,
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so that type of the matcher is always `PredicateMatcher<T>`, regardless
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of the type of the predicate. Because of the high compilation overhead
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of `std::function`, and the fact that the type erasure is used only rarely,
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`PredicateMatcher` will no longer be type erased in the future. Instead,
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the predicate type will be made part of the PredicateMatcher's type.
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---
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[Home](Readme.md#top)
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