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9.0

Convert UINT64 to double (MSVC6)

Asked by dude_1967 in C++ Programming Language

Tags: uint64, msvc6, double

Dear Experts,

MSVC6 can not internally convert unsigned __int64 to double. However, VC.NET 2003 (among others) can do the conversion. In addition GCC for Intel Architectures can internally convert unsigned long long, also 64-bit unsigned integer, to double.

Does anyone have a good work-around for MSVC6? I'm using the code snippet shown below, but I find it unsatisfactory. First of all, the code does not use the full range, since for MSVC6 there is a conversion to signed 64-bit integer, and also the snippet is ugly and disturbs the more 'normal' use of static_cast<double>(UINT64 u64). Is it possible to make a template specialization for static_cast<double>(UINT64 u64) specifically for MSVC6? Alternatively, does anyone know the compiler intrinsic mathematics for the proper conversion of UINT64 to double so that I can at least correct my code snippet?

Thanks for your help.

Sincerely, Chris.

inline double UINT64_to_double(const UINT64& u)
{
  #if defined (_MSC_VER) && (_MSC_VER <= 1200)

    return static_cast<double>(static_cast<INT64>(u));

  #else

    return static_cast<double>(u);

  #endif
}
[+][-]09/15/04 04:49 AM, ID: 12063429Assisted Solution

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[+][-]09/15/04 04:55 AM, ID: 12063464Accepted Solution

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Zone: C++ Programming Language
Tags: uint64, msvc6, double
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Solution Provided By: grg99
Participating Experts: 2
Solution Grade: A
 
[+][-]09/15/04 05:27 AM, ID: 12063710Assisted Solution

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[+][-]09/15/04 05:33 AM, ID: 12063754Assisted Solution

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[+][-]09/15/04 08:19 AM, ID: 12065751Author Comment

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[+][-]09/15/04 09:45 AM, ID: 12066912Expert Comment

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