boost::variant - How to assign values

Question

I have a boost variant and I want to assign values to it. The code looks like..

boost::variant <int, std::vector<int>,std::vector<float> > MyVariant;

How can I assign values to, int, vector of ints and vector of floats. Simple assignment is not working.

Please edit your question to show what you've tried so far. The [documentation](https://www.boost.org/doc/libs/1_68_0/doc/html/variant/tutorial.html) seems fairly clear. — G.M., Sep 17 '18 at 11:18
what is the meaning of "not working" ? Please include the code and the error messages in the question. — 463035818_is_not_an_ai, Sep 17 '18 at 11:43

score 2 · Answer 1 · edited Sep 17 '18 at 11:58

2

It seems pretty straightforward:

#include <boost/variant.hpp>
#include <vector>

int main()
{
    using MyVariant = boost::variant<int, std::vector<int>, std::vector<float>>;
    MyVariant m;
    m = 1;
    m = std::vector<int>{1, 2, 3};
    m = std::vector<float>{1.f, 2.f, 3.f};
    return 0;
}

With a C++17 compiler you can use std::variant instead of boost::variant.

edited Sep 17 '18 at 11:58

Tas

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answered Sep 17 '18 at 11:23

Max

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boost::variant - How to assign values

1 Answers1