variant is not assigning the float

Question

#include <iostream>
#include <variant>
using namespace std;
 
int main()
{
    variant<int, float> var{0.23};
    if(holds_alternative<float>(var)){
        if(var.index() == 1){
            cout << get<float>(var) << endl;
        }
    }
    
    return 0;
}

The initialization should work but instead it gives the following error:

main.cpp: In function 'int main()': main.cpp:7:33: error: no matching function for call to 'std::variant<int, float>::variant()'

I'm not sure if I made a mistake in the code.

MikeCAT · Accepted Answer · 2021-02-21 06:49:22Z

2

0.23 is double. You should use 0.23f, which is float, instead.

answered Feb 21, 2021 at 6:49

MikeCAT

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Comments

asmmo · Accepted Answer · 2021-02-21 08:07:05Z

1

The initialization failed because of the narrowing conversion inside the curly braces. so use

   variant<int, float> var{0.23f};

instead.

Note that 0.23 is a double literal, not a float one.

See demo

edited Feb 21, 2021 at 8:07

answered Feb 21, 2021 at 6:50

asmmo

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