wilhelmtell

I don't find this "cache end()" guideline of LLVM right: http://llvm.org/docs/CodingStandards.html#don-t-evaluate-end-every-time-through-a-loop It's a case of premature optimization, and it actually leaves room for error because the new identifier is a non-const lvalue.

wilhelmtell

#include <utility>
#include <iostream>

struct exclusive {
  exclusive() : o{true} { std::cout << this << " exclusive init\n"; }
  ~exclusive() {
    if(owning())
      std::cout << this << " exclusive cleanup\n";
    else
      std::cout << this << " exclusive no cleanup\n";

wilhelmtell

#include <cmath>

int main() {
  auto const cos = [](auto const& exp) { return [&]() { return std::cos(exp()); }; };
  auto const sin = [](auto const& exp) { return [&]() { return std::sin(exp()); }; };
  auto const term = [](auto const& x) { return [&]() { return x; }; };
  auto const eval = [](auto const& exp) { return exp(); };

  std::cout << eval(cos(sin(term(0.5 * M_PI)))) << '\n';
}

wilhelmtell

Keybase proof

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• I am wilhelmtell on github.
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To claim this, I am signing this object: