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xo-object: + DString.compare() + utest

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This commit is contained in:
Roland Conybeare 2026-01-15 17:21:37 -05:00
commit 3052ecdbcf
3 changed files with 30 additions and 1 deletions
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6
include/xo/object2/DString.hpp
View file

@ -164,6 +164,11 @@ namespace xo {
return size_;
}
/** lexicographically compare two strings.
* @return <0 if lhs < rhs, 0 if equal, >0 if lhs > rhs
**/
static int compare(const DString & lhs, const DString & rhs) noexcept;
// TODO - behave like std::string, to the extent feasible
// insert
// insert_range
@ -181,7 +186,6 @@ namespace xo {
// find_first_not_of
// find_last_of
// find_last_not_of
// compare
// starts_with
// end_with
// contains

6
src/object2/DString.cpp
View file

@ -84,6 +84,12 @@ namespace xo {
return *this;
}
int
DString::compare(const DString & lhs, const DString & rhs) noexcept
{
return ::strcmp(lhs.chars_, rhs.chars_);
}
auto
DString::fixup_size() noexcept -> size_type
{

19
utest/DString.test.cpp
View file

@ -292,6 +292,25 @@ namespace xo {
REQUIRE(s->size() == 7);
REQUIRE(std::strcmp(s->chars(), "hello w") == 0);
}
TEST_CASE("DString-compare", "[object2][DString]")
{
ArenaConfig cfg { .name_ = "testarena",
.size_ = 4*1024 };
DArena arena = DArena::map(cfg);
auto alloc = with_facet<AAllocator>::mkobj(&arena);
DString * s1 = DString::from_cstr(alloc, "apple");
DString * s2 = DString::from_cstr(alloc, "apple");
DString * s3 = DString::from_cstr(alloc, "banana");
DString * s4 = DString::from_cstr(alloc, "aardvark");
REQUIRE(DString::compare(*s1, *s2) == 0);
REQUIRE(DString::compare(*s1, *s3) < 0);
REQUIRE(DString::compare(*s3, *s1) > 0);
REQUIRE(DString::compare(*s1, *s4) > 0);
REQUIRE(DString::compare(*s4, *s1) < 0);
}
} /*namespace ut*/
} /*namespace xo*/