sc::bigunit loading from string adds leading 'F's

[Slava]

Hello,

When I try to initialize sc::bigunit from string:

sc_biguint<128> test("0X9080706050403020100");
std::string st = test.to_string(sc_dt::SC_HEX);

The string returned by test.to_string(sc_dt::SC_HEX) is:

"0x0fffffffffffff9080706050403020100".

What is the reason for  leading 'F's?

Thanks,

Slava

 

[David Black]

You specified a signed number which was converted to unsigned under rules of twos complement. Change “0x to “0xus and you will obtain desired results. See section 7.3 String literals on page 199 of IEEE-1666-2011 for more information.