为什么会出现错误 C3851（通用字符名称不能指定基本字符集中的字符）？

Question

我一直在尝试将 an example whitespace remover 从这里翻译成 C++-cli 项目中的运行。就智能感知而言，以下内容看起来不错：

static String^ TrimAllWithInplaceCharArray(String^ str)
{
    unsigned int len = str->Length;
    array<wchar_t, 1>^ src = str->ToCharArray();
    int dstIdx = 0;
    for (unsigned int i = 0; i < len; i++) {
        wchar_t ch = src[i];
        switch (ch) {
            case L'\u0020': case L'\u00A0': case L'\u1680': case L'\u2000': case L'\u2001':
            case L'\u2002': case L'\u2003': case L'\u2004': case L'\u2005': case L'\u2006':
            case L'\u2007': case L'\u2008': case L'\u2009': case L'\u200A': case L'\u202F':
            case L'\u205F': case L'\u3000': case L'\u2028': case L'\u2029': case L'\u0009':
            case L'\u000A': case L'\u000B': case L'\u000C': case L'\u000D': case L'\u0085':
                continue;
            default:
                src[dstIdx++] = ch;
                break;
        }
    }
    return gcnew String(src, 0, dstIdx);
}

...但不编译：

error C3851 : '\u0020' : a universal - character - name cannot designate a character in the basic character set
error C3850 : '\u0009' : a universal - character - name specifies an invalid character
error C3850 : '\u000A' : a universal - character - name specifies an invalid character
error C2196 : case value '63' already used
error C3850 : '\u000B' : a universal - character - name specifies an invalid character
error C2196 : case value '63' already used
error C3850 : '\u000C' : a universal - character - name specifies an invalid character
error C2196 : case value '63' already used
error C3850 : '\u000D' : a universal - character - name specifies an invalid character
error C2196 : case value '63' already used
error C3850 : '\u0085' : a universal - character - name specifies an invalid character
error C2196 : case value '63' already used

我是否以某种方式错误地表示数据类型或文字值？

Answer 1

看看以下是否有效...

static String^ TrimAllWithInplaceCharArray(String^ str)
{
    unsigned int len = str->Length;
    array<wchar_t, 1>^ src = str->ToCharArray();
    int dstIdx = 0;
    for (unsigned int i = 0; i < len; i++) {
        wchar_t ch = src[i];
        switch (ch) {
        case L'\x20': case L'\xA0': case L'\u1680': case L'\u2000': case L'\u2001':
        case L'\u2002': case L'\u2003': case L'\u2004': case L'\u2005': case L'\u2006':
        case L'\u2007': case L'\u2008': case L'\u2009': case L'\u200A': case L'\u202F':
        case L'\u205F': case L'\u3000': case L'\u2028': case L'\u2029': case L'\x09':
        case L'\x0A': case L'\x0B': case L'\x0C': case L'\x0D': case L'\x85':
            continue;
        default:
            src[dstIdx++] = ch;
            break;
        }
    }
    return gcnew String(src, 0, dstIdx);
}

找到这个 here...

"You cannot use - u0022 because you cannot use a universal character name that designates a character in the basic character set."

为什么会出现错误 C3851（通用字符名称不能指定基本字符集中的字符）？

Why do I get error C3851 (a universal-character-name cannot designate a character in the basic character set)?

c++-cli

removing-whitespace