bitset problem

This is a discussion on bitset problem within the C++ Programming forums, part of the General Programming Boards category; HI all I need to build up a bitset object - 90-bits wide - but i can't seem to initialise ...

  1. #1
    Registered User
    Join Date
    Sep 2009
    Posts
    4

    bitset problem

    HI all
    I need to build up a bitset object - 90-bits wide - but i can't seem to initialise it. The constructor is probably limited to a 64-bit number? Can i override this (if it is the case)?

    Code:
    bitset<90> hexValLs90(0xFFFFFFFFFFFFFFFFF);
    Code:
    g++ -Wall -g -o netdriver netdriver.cpp
    netdriver.cpp:331:25: warning: integer constant is too large for its type
    netdriver.cpp: In function `int writeSimPatternHeader(std::ofstream&, long int*)':
    netdriver.cpp:331: error: integer constant is too large for "long" type
    I see from this page, that it should work perfectly well? Any ideas?

    Cheers

    S

  2. #2
    The larch
    Join Date
    May 2006
    Posts
    3,573
    The constructor takes an unsigned long (could be 64, could be 32 bits - or other).

    In any case, treating a bitset of this size as a number is going to be a problem.

    What you can do is initialize the bitset to 0 and then flip all bits:

    Code:
    bitset<90> bs;
    bs.flip();
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

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