How to declare a function using assignment operator?

Question

This is my code. Every time I try to compile it, it gives me this error 
 expected primary-expression before 'float' at line 3 
#include<iostream>
using namespace std;
auto fun = (float x){
    return 1/(1-x);
};
int main(){
    auto x=fun(0.5);
    cout<<x;
    return 0;
}

bipll · Answer

auto fun = [](float x){
    return 1/(1-x);
};

ネロク · Answer

With the assignment operator (i.e., =) I can think of a lambda instead of a function:
auto fun = [](float x){
    return 1/(1-x);
};

That is, just by adding empty square brackets (i.e., [], which corresponds to the lambda capture list) before the parameter list, turns the code following the = into a lambda expression.
Technically, the = above isn't really the assignment operator. It just belongs to the syntax of copy initialization.

How to declare a function using assignment operator?

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