EOS 智能合约源代码解读 （4）symbol.hpp

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token的名称和数字精度

• 名称大写

 /**
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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