[llvm-bugs] [Bug 39606] New: std::function does not have deduction guides

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39606

            Bug ID: 39606
           Summary: std::function does not have deduction guides
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ldionne at apple.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

We're missing deduction guides for std::function. The following code does not
compile with libc++ trunk:

--------------------------------------
#include <functional>

int func(double) { return 0; }
int main() {
  std::function f{func}; // guide #1 deduces function<int(double)>
  int i = 5;
  std::function g = [&](double) { return i; }; // guide #2 deduces
function<int(double)>
}
--------------------------------------

Taken from SO question: https://stackoverflow.com/q/53217511/1708801

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