token的名稱和數字精度

• 名稱大寫

/** class symbol represents a token and contains precision and name. When encoded as a uint64_t, first byte represents the number of decimals, remaining bytes represent token name. Name must only include upper case alphabets. from_string constructs a symbol from an input a string of the form "4,TTT" where the integer represents number of decimals. Number of decimals must be larger than zero. */class symbol : fc::reflect_init {public:static constexpr uint8_t max_precision = 18;explicit symbol(uint8_t p, const char* s): m_value(string_to_symbol(p, s)) {xxx_ASSERT(valid(), symbol_type_exception, "invalid symbol: ${s}", ("s",s));}uint64_t value() const { return m_value; }string name() const{uint64_t v = m_value;v >>= 8;string result;while (v > 0) {char c = v & 0xFF;result += c;v >>= 8;}return result;}private:uint64_t m_value;friend struct fc::reflector<symbol>;}; // class symbolstruct extended_symbol {symbol sym;text_name contract;};

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