具有char [5]键的std :: map可能包含空字节

std::string

//must use this as:
std::string key1(\"ab\\0a\",4); 
std::string key2(\"ab\\0b\",4); 
std::string key3(\"a\\0b\\0b\",5); 
std::string key4(\"a\\0\\0b\\0b\",6); 

string ( const char * s, size_t n );

std::array<char,5>

std::bitset

char[5]

map

map

Compare

less<Key>

map

class MyKeyComp
{
  public:
  operator()(char* lhs, char* rhs)
  {
    return lhs[0] == rhs[0] ? 
       (lhs[1] == rhs[1] ? 
       (lhs[2] == rhs[2] ? 
       (lhs[3] == rhs[3] ? lhs[4] < rhs[4]) 
       : lhs[3] < rhs[3]) 
       : lhs[2] < rhs[2]) 
       : lhs[1] < rhs[1]) 
       : lhs[0] < rhs[0];
  }
};