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AK: Make the constexpr StringView methods actually constexpr
Also add some tests to ensure that they _remain_ constexpr. In general, any runtime assertions, weirdo C casts, pointer aliasing, and such shenanigans should be gated behind the (helpfully newly added) AK::is_constant_evaluated() function when the intention is to write constexpr-capable code. a.k.a. deliver promises of constexpr-ness :P
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3 changed files with 41 additions and 4 deletions
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@ -177,3 +177,28 @@ TEST_CASE(split_view)
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EXPECT_EQ(test_string_view.split_view_if(predicate), Vector<StringView>({ "a", "b", "c", "d" }));
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EXPECT_EQ(test_string_view.split_view_if(predicate, true), Vector<StringView>({ "a", "", "b", "c", "d" }));
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}
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TEST_CASE(constexpr_stuff)
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{
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#define do_test() \
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static_assert(test_constexpr.length() == 3); \
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static_assert(!test_constexpr.is_empty()); \
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static_assert(test_constexpr.is_one_of("foo", "bar", "baz")); \
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static_assert(test_constexpr.is_one_of("foo"sv, "bar"sv, "baz"sv)); \
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static_assert(test_constexpr != "fob"sv); \
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static_assert(test_constexpr != "fob"); \
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static_assert(test_constexpr.substring_view(1).is_one_of("oo"sv));
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{
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// Can initialize from ""sv.
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constexpr StringView test_constexpr { "foo"sv };
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do_test();
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}
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{
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// Can initialize from char const*.
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constexpr StringView test_constexpr { "foo" };
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do_test();
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}
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#undef do_test
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}
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