zstring_view: Add class
This adds a string_view variant that guarantees the nul terminating
character of the string is always present. Useful for c-style interface
interop.
Change-Id: Ic918d2f59e2a7a983354a7b0b4755cb033a1db5e
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/zstring_view.cpp b/test/zstring_view.cpp
new file mode 100644
index 0000000..45ee8d3
--- /dev/null
+++ b/test/zstring_view.cpp
@@ -0,0 +1,65 @@
+#include <gtest/gtest.h>
+#include <iostream>
+#include <set>
+#include <stdplus/zstring_view.hpp>
+#include <string>
+#include <unordered_set>
+
+namespace stdplus
+{
+
+using std::literals::string_literals::operator""s;
+using zstring_view_literals::operator""_zsv;
+
+TEST(ZstringView, Basic)
+{
+ auto s1 = zstring_view("ac");
+ auto s = "b"s;
+ auto s2 = zstring_view(s);
+ std::string_view sv = s1;
+
+ EXPECT_NE(sv, s2);
+ EXPECT_NE(s1, s2);
+
+ EXPECT_EQ("ac"_zsv, s1);
+ EXPECT_EQ("ac", s1);
+ EXPECT_EQ(s1, "ac");
+ EXPECT_EQ(s, s2);
+ EXPECT_EQ(s2, s);
+ EXPECT_EQ(s1, sv);
+ EXPECT_EQ(sv, s1);
+ EXPECT_LT("ab", s1);
+ EXPECT_GT("ad", s1);
+ EXPECT_LE(s1, "ac");
+ EXPECT_LE(s, s2);
+ EXPECT_LE(s2, s);
+ EXPECT_LE(s1, sv);
+ EXPECT_LE(sv, s1);
+
+ std::cerr << s1;
+
+ std::unordered_set<zstring_view> uset{s1, s2};
+ EXPECT_EQ(1, uset.count("ac"));
+ EXPECT_EQ(1, uset.count("b"));
+ std::set<zstring_view> set{s2, s2};
+ EXPECT_EQ(0, set.count("ac"));
+ EXPECT_EQ(1, set.count("b"));
+}
+
+TEST(ZstringView, ConstructError)
+{
+ auto s = "hi\0"s;
+ EXPECT_THROW((zstring_view(s)), std::invalid_argument);
+}
+
+TEST(ZstringView, Suffix)
+{
+ auto s1 = zstring_view("ac");
+
+ EXPECT_EQ("ac", s1.suffix(0));
+ EXPECT_EQ("c", s1.suffix(1));
+ EXPECT_EQ("", s1.suffix(2));
+ EXPECT_THROW(s1.suffix(3), std::out_of_range);
+}
+
+} // namespace stdplus