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Add PredicateMatcher that takes an arbitrary predicate functions

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Also adds `Predicate` helper function to create `PredicateMatcher`.
Because of limitations in type inference it needs to be explicitly
typed, like so
`Predicate<std::string>([](std::string const& str) { ... })`.
It also takes an optional second argument for description of the
predicate.

It is possible to infer the argument with sufficient TMP, see
https://stackoverflow.com/questions/43560492/how-to-extract-lambdas-return-type-and-variadic-parameters-pack-back-from-gener/43561563#43561563
but I don't think that the magic is worth introducing ATM.

Closes #1236
This commit is contained in:
Martin Hořeňovský
2018-04-03 23:28:14 +02:00
parent dfb83f20e9
commit 1ca8f43b01
11 changed files with 204 additions and 7 deletions
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projects/SelfTest/Baselines/compact.sw.approved.txt
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@@ -97,6 +97,10 @@ Approx.tests.cpp:<line number>: passed: 0 == Approx( dZero) for: 0 == Approx( 0.
Approx.tests.cpp:<line number>: passed: 0 == Approx( dSmall ).margin( 0.001 ) for: 0 == Approx( 0.00001 )
Approx.tests.cpp:<line number>: passed: 1.234f == Approx( dMedium ) for: 1.234f == Approx( 1.234 )
Approx.tests.cpp:<line number>: passed: dMedium == Approx( 1.234f ) for: 1.234 == Approx( 1.2339999676 )
Matchers.tests.cpp:<line number>: passed: 1, Predicate<int>(alwaysTrue, "always true") for: 1 matches predicate: "always true"
Matchers.tests.cpp:<line number>: passed: 1, !Predicate<int>(alwaysFalse, "always false") for: 1 not matches predicate: "always false"
Matchers.tests.cpp:<line number>: passed: "Hello olleH", Predicate<std::string>( [] (std::string const& str) -> bool { return str.front() == str.back(); }, "First and last character should be equal") for: "Hello olleH" matches predicate: "First and last character should be equal"
Matchers.tests.cpp:<line number>: passed: "This wouldn't pass", !Predicate<std::string>( [] (std::string const& str) -> bool { return str.front() == str.back(); } ) for: "This wouldn't pass" not matches undescribed predicate
Tricky.tests.cpp:<line number>: passed: true
Tricky.tests.cpp:<line number>: passed: true
Tricky.tests.cpp:<line number>: passed: true