CODEWITHSUNDEEP
c++
Hani Goc
Hani Goc

Reputation: 2441

Why am I getting Invalid initialization of reference of type ‘const vec&'

Introduction

I am using the itpp library version 4.3.1 in order to compute the skewness of a vector. The library can be downloaded from here.

The library can be install as follows:

mkdir build;
cd build;
cmake ..
make
sudo make install

Source code

I am using the following source code to compute the skewness.

#include <itpp/stat/misc_stat.h>

using namespace itpp;

int main(int argc, char* argv[])
{
   vector<double> x{2,3,4,5,6};
   double skew = skewness (x);
   return 0;
}

Skewness function in the library

double  itpp::skewness (const vec &x)
    Calculate the skewness excess of the input vector x.

error

error: invalid initialization of reference of type ‘const vec& {aka const itpp::Vec<double>&}’ from expression of type ‘std::vector<double>’
    double skew = skewness (x);
                             ^
In file included from  main.cpp:3:0:
/usr/local/include/itpp/stat/misc_stat.h:336:20: note: in passing argument 1 of ‘double itpp::skewness(const vec&)’
 ITPP_EXPORT double skewness(const vec &x);

I don't understand why am I getting this error.

Thank you.

Upvotes: 0

Views: 1134

Answers (2)

mindriot
mindriot

Reputation: 5678

skewness() appears to take a parameter of type const itpp::Vec<double>&, but you are giving it a std::vector<double>, which cannot implicitly be converted into the former type. You need to declare x to be of type itpp::Vec<double> instead, or maybe you can explicitly convert x to an object of that type, provided itpp lets you do that (I don't know the library).

Upvotes: 3

P45 Imminent
P45 Imminent

Reputation: 8601

A const vec& is not a const std::vector&, so the argument does not match.

Upvotes: 3

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