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  1. #include <vector>
  2. using std::size_t;
  3.  
  4. struct Foo {
  5.    std::vector<int> bars;
  6.    int& operator[](size_t idx) {
  7.       return bars[idx];
  8.    }
  9. };
  10.  
  11. class Bar {
  12.    Foo *foo; //some initialization
  13.  
  14.    int& helper(size_t idx) {
  15.       return (*foo)[idx];
  16.    }
  17.  
  18.    void barfoo() {
  19.       size_t baz = 1;
  20.       int qux;
  21.  
  22.       //solution 1
  23.       qux = (*foo)[baz];  //works
  24.       (*foo)[baz] = 1;    //works
  25.  
  26.       //solution 2
  27.       qux = helper(baz);  //works
  28.       helper(baz) = 1;    //does not work: "expression is not assignable"
  29.    }     
  30. };
  31.  
  32. int main() {}
  33.  
Success #stdin #stdout 0s 3292KB
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https://ideone.com/cIfszt
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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