Compilation error while creating array as key of unordered map

Asked Feb 03 '16 at 17:08

Active Feb 03 '16 at 17:13

Viewed 40 times

I am compiling the below program with g++ -std=c++11 lol.cpp and getting a weird error. Please help!

#include <iostream>
#include <unordered_map>
#include <array>

int main(void)
{
  std::unordered_map <std::array<int, 2>, int> abc;
}

edited Feb 03 '16 at 17:13

asked Feb 03 '16 at 17:08

Lokesh

What are weird errors? – Evan Carslake Feb 03 '16 at 17:09
https://gist.github.com/lokeshh/f1f007bc8d3756ff2c92 – Lokesh Feb 03 '16 at 17:13
`unordered_map` doesn't know how to hash a `std::array`. – 101010 Feb 03 '16 at 17:16
@101010 Are you sure? Because [this] (http://stackoverflow.com/questions/9848868/using-unordered-map-on-array-of-doubles) answer here says it does. – Lokesh Feb 03 '16 at 17:17
1

@Lokesh Please put error messages verbatim in your question, not in a link. – πάντα ῥεῖ Feb 03 '16 at 17:20
@πάνταῥεῖ It's 130 lines long and I have no idea which portion is the relevant one. That's why I have pasted the gist link. – Lokesh Feb 03 '16 at 17:21
@Lokesh How are you sure that answer was correct? – πάντα ῥεῖ Feb 03 '16 at 17:21
@πάνταῥεῖ I don't know for sure. – Lokesh Feb 03 '16 at 17:22
@101010 Hmm... That's sad to know. Anyway, I want use two integer values as the hash key. Isn't there any easy way other than define a struct and how to hash it? – Lokesh Feb 03 '16 at 17:33

0 Answers0