Merge "[String8] Add string_view ctor" into main

    EXPECT_TRUE(pair1 < pair2);

    EXPECT_FALSE(pair1 > pair2);

}

TEST_F(String8Test, SvCtor) {

    const char* expected = "abc";

    std::string s{expected};

    EXPECT_STREQ(String8{s}.c_str(), expected);

    EXPECT_STREQ(String8{std::string_view{s}}.c_str(), expected);

    EXPECT_STREQ(String8{expected}.c_str(), expected);

}

                                String8(const String8& o);

    explicit                    String8(const char* o);

    explicit                    String8(const char* o, size_t numChars);

#ifdef HAS_STRING_VIEW

    explicit                    String8(std::string_view o);

#endif

    explicit                    String8(const String16& o);

    explicit                    String8(const char16_t* o);

}

#ifdef HAS_STRING_VIEW

inline String8::String8(std::string_view o) : String8(o.data(), o.length()) { }

inline String8::operator std::string_view() const

{

    return {mString, length()};