How to make Vim indent C++11 lambdas correctly?

Vim seems not indent C++11 lambas very well. How to make Vim indent C++11 lambdas correctly?

For this following program, Vim indents it as

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

int main ()
{
  std::vector<std::string> strs({"one", "two"});
  std::vector<std::string> newstrs;

  std::transform(strs.begin(), strs.end(), std::back_inserter(newstrs), [](const std::string& s) -> std::string {
      if (s == "one") {
      return "1";
      } else if (s == "two") {
      return "2";
      } else {
      return s;
      }
      });

  return 0;
}

The C++ lambda is indented incorrectly by Vim. The lambda function should be indented like

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

int main ()
{
  std::vector<std::string> strs({"one", "two"});
  std::vector<std::string> newstrs;

  std::transform(strs.begin(), strs.end(), std::back_inserter(newstrs), [](const std::string& s) -> std::string {
    if (s == "one") {
      return "1";
    } else if (s == "two") {
      return "2";
    } else {
      return s;
    }
  });

  return 0;
}
asked Dec 29, 2017 by anonymous

1 Answer

You may add these lines to your vimrc for C/C++ to indent lambdas correctly as you listed above

setlocal cindent
" handle lambda correctly
setlocal cino=j1,(0,ws,Ws

The key is setting cino (cinoption) to be j1,(0,ws,Ws. jN is new in Vim 7.4 for "indent Java anonymous classes correctly" which improves C/C++ lambda indenting too.

Check my vimrc as an example.

answered Jan 2 by Eric Z Ma (44,200 points)

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