C++ (Cpp) basic_string_view::length示例

示例#1

文件： index.pass.cpp 项目： llvm-mirror/libcxx

int main(int, char**) {
    test ( "ABCDE", 5 );
    test ( "a", 1 );

    test ( L"ABCDE", 5 );
    test ( L"a", 1 );

#if TEST_STD_VER >= 11
    test ( u"ABCDE", 5 );
    test ( u"a", 1 );

    test ( U"ABCDE", 5 );
    test ( U"a", 1 );
#endif

#if TEST_STD_VER > 11
    {
    constexpr std::basic_string_view<char> sv ( "ABC", 2 );
    static_assert ( sv.length() ==  2,  "" );
    static_assert ( sv[0]  == 'A', "" );
    static_assert ( sv[1]  == 'B', "" );
    }
#endif

  return 0;
}

示例#2

文件： back.pass.cpp 项目： Aj0Ay/libcxx

int main () {
    assert ( test ( "ABCDE", 5 ));
    assert ( test ( "a", 1 ));

    assert ( test ( L"ABCDE", 5 ));
    assert ( test ( L"a", 1 ));

#if TEST_STD_VER >= 11
    assert ( test ( u"ABCDE", 5 ));
    assert ( test ( u"a", 1 ));

    assert ( test ( U"ABCDE", 5 ));
    assert ( test ( U"a", 1 ));
#endif

#if TEST_STD_VER >= 11
    {
    constexpr std::basic_string_view<char> sv ( "ABC", 2 );
    static_assert ( sv.length() ==  2,  "" );
    static_assert ( sv.back()  == 'B', "" );
    }
#endif
}

示例#3

文件： data.pass.cpp 项目： Aj0Ay/libcxx

int main () {
    test ( "ABCDE", 5 );
    test ( "a", 1 );

    test ( L"ABCDE", 5 );
    test ( L"a", 1 );

#if TEST_STD_VER >= 11
    test ( u"ABCDE", 5 );
    test ( u"a", 1 );

    test ( U"ABCDE", 5 );
    test ( U"a", 1 );
#endif

#if _LIBCPP_STD_VER > 11
    {
    constexpr const char *s = "ABC";
    constexpr std::basic_string_view<char> sv( s, 2 );
    static_assert( sv.length() ==  2,  "" );
    static_assert( sv.data() == s, "" );
    }
#endif
}