modify has function from string parameter to templates...

This is a discussion on modify has function from string parameter to templates... within the C++ Programming forums, part of the General Programming Boards category; hello, I have this function: template <class T> unsigned int HashTable<T>::hash( const string & key ) const { unsigned int ...

  1. #1
    Registered User
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    Jan 2003
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    9

    Question modify has function from string parameter to templates...

    hello, I have this function:

    template <class T> unsigned int HashTable<T>::hash( const string & key ) const
    {
    unsigned int hashVal = 0;
    // cout << key << "%";
    for( size_t i = 0; i < key.size(); i++ )
    hashVal = ( hashVal << 5 ) ^ key[ i ] ^ hashVal;
    return hashVal;
    }

    how to I convert it so it works with all data types?

  2. #2
    Super Moderator
    Join Date
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    4,913
    To format your code properly for the board, put a [/code] tag at the end of your source code, and a [code] at the beginning. Edit your post and add those (with indentation) - you're much more likely to get help if your source code is easier to read.

  3. #3
    Guest Sebastiani's Avatar
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    Waterloo, Texas
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    5,708
    you can pass the hash function as a template parameter instead.

    Code:
     template <class T, class hash = some_sensible_default>
    class HashTable {
     //...
     };
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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