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我這個普通的字符串數轉換:如何把性病:: DEC /六角/月到查找陣列
enum STRING_BASE : signed int {
BINARY = -1,
OCTAL = 0,
DECIMAL = 1,
HEX = 2,
};
template <class Class>
static bool fromString(Class& t, const std::string& str, STRING_BASE base = DECIMAL) {
if (base == BINARY) {
t = (std::bitset<(sizeof(unsigned long)*8)>(str)).to_ulong();
return true;
}
std::istringstream iss(str);
std::ios_base& (*f)(std::ios_base&); /// have no idea how to turn this into a look-up array
switch (base) {
case OCTAL: f = std::oct; break;
case DECIMAL: f = std::dec; break;
case HEX: f = std::hex; break;
}
return !(iss >> f >> t).fail();
};
我想打開開關情況下,成精的樣子-up陣列,沿着這些路線的東西:
std::ios_base arr[2] = {std::oct, std::dec, std::hex};
return !(iss >> arr[(int)base] >> t).fail();
這產生:*錯誤C2440:初始化:不能從轉換 '的std ::的ios_base &(__cdecl )(標準::的ios_base &)' 到' std :: ios_base'
這也不行:
std::ios_base& arr[2] = {std::oct, std::dec, std::hex};
我得到:錯誤C2234: '常用3':引用數組是非法
那麼,有沒有辦法解決這個問題?