Summary: Dave Watson put this in github a few months ago.

Test Plan: None

Reviewed By: delong.j@fb.com

FB internal diff: D912681

Summary:
gcc 4.6 doesn't know of -Wmaybe-uninitialized, so it reports a warning, which
we treat as an error.

Test Plan: compiled folly/test folly/experimental/test with gcc 4.6.2, 4.7.1, 4.8.1

Reviewed By: philipp@fb.com

FB internal diff: D945766

Summary: gcc 4.8 is picky

Test Plan: folly tests, compiled unicorn with gcc 4.8

Reviewed By: andrei.alexandrescu@fb.com

FB internal diff: D945336

Summary:
This is part of what's required to make mcrouter compile warning-free
with gcc -Wshadow.  In case it's not obvious why this is worth doing,
see t2719164.

I've used two techniques:
rename one of the shadowed variables
bracket offending code with #pragma directives to disable the warning there.

* folly/Bits.h (BitIterator): Guard this function with #pragma
to avoid a warning about its member-shadowing "bitOffset" parameter.
* folly/Memory.h (StlAllocator): Rename parameter in trivial, one-line
function definition, s/alloc/a/, to avoid shadowing the member function.
Let me know if you'd prefer #pragma directives instead.
* folly/io/Cursor.h (pull,skip,clone): Rename parameter, s/length/len/,
not to shadow the member function name.

Test Plan:
build and run tests of a few tools that use these headers

Reviewed By: jon.coens@fb.com

FB internal diff: D940493

Test Plan: built producer_consumer_queue_test with gcc 4.7.1
@override-unit-failures

Reviewed By: chip@fb.com

FB internal diff: D942465

Summary: Boost's version is 4.8 safe.  std's version changes name

Test Plan: hhvm builds

Reviewed By: andrei.alexandrescu@fb.com

FB internal diff: D883508

Summary: https://github.com/facebook/folly/issues/35

@override-unit-failures
hphp tests independently broken

Test Plan: test added

Reviewed By: delong.j@fb.com

FB internal diff: D939323

Summary: Previous implementation only printed the desired state, not the actual runtime state. Fix that.

Test Plan: n/a

Reviewed By: tudorb@fb.com

FB internal diff: D936279

Test Plan:
fbconfig -r folly/test && fbmake opt -j32

Reviewed By: tjackson@fb.com

FB internal diff: D935182

Test Plan: fbconfig folly/test:file_test && fbmake runtests_opt

Reviewed By: soren@fb.com

FB internal diff: D932782

Summary: Also important spelling mistakes.
@override-unit-failures

Test Plan: string_test

Reviewed By: tjackson@fb.com

FB internal diff: D930037

Test Plan: test added

Reviewed By: alandau@fb.com

FB internal diff: D928836

Test Plan: test added

Reviewed By: alandau@fb.com

FB internal diff: D928835

Summary:
There appears to be a race here.  leizha reported issues with
a heavily recycled AtomicHashMap (ThreadCachedInt inside).  It looks
like what's happening is this:

- Thread A: ~ThreadCachedInt from an AHM
- meta lock is taken, and the ThreadElement list is iterated
- all entries are zerod, and the id is marked free
- then releases the lock
- Thread B: someone is calling get() on an unrelated id
- hit reserve: rallocm on the pointer or unsynchronized memcpy from
the element vector
- waits on the lock
- when it gets the lock, it stores back the value that it read that
was zero'd by A.

Later, someone reuses the id from the freelist, and reuses the
previously freed pointer, and eventually double-freeing it.  (nullptr
is the signifier for "this thread doesn't have an instance of the
threadlocal yet").

Test Plan:
leizha's test case doesn't segv after this diff---it was
reliably breaking with corruption in malloc before it.  I'm working on
making that test case into a unit test to add to this diff, but I'm
putting it up early in case there's something wrong with the theory
above or in case someone has an idea for a better fix.

Reviewed By: tudorb@fb.com

FB internal diff: D928534

Summary:
With gcc-4.8.[01], the argument to __attribute__((__aligned__(...)))
must be a literal;  using an enum member evokes this:

./folly/MPMCQueue.h:341:63: error: requested alignment is not an \
integer constant
size_t capacity_ FOLLY_ON_NEXT_CACHE_LINE;

Changing the enum member to this made no difference:

static constexpr size_t kFalseSharingRange = 64;

Test Plan: compile tao and run test suite

Reviewed By: andrei.alexandrescu@fb.com

FB internal diff: D926221

@override-unit-failures

Test Plan: compiled using gcc-4.8

Reviewed By: meyering@fb.com

FB internal diff: D923895

Summary:
This is required for gcc-4.8.x.
Use boost::has_trivial_destructor, not std::has_trivial_destructor.
The latter was never standard, and the now-std name (and the only one
supported in gcc-4.8.0) is std::is_trivially_destructible.

Test Plan:
fbmake runtests and then
run_unit_tests.sh with -r and again with -d

Reviewed By: njormrod@fb.com

FB internal diff: D923359

@override-unit-failures

Summary: davejwatson: you asked

Test Plan: test added

Reviewed By: davejwatson@fb.com

FB internal diff: D917336

Summary: This reverts commit 49b197dfd02443e958906bac45059cea460e4e10.

Test Plan: contbuild

Reviewed By: akhilravidas@fb.com

FB internal diff: D915386

@override-unit-failures

Summary:
Clang doesn't like the same member of a class being defined more than once,
or default argument values being defined more than once. This diff removes some
instances.

@override-unit-failures

Test Plan: Compiled the code with Clang and GCC

Reviewed By: andrewjcg@fb.com

FB internal diff: D913226

Summary:
For dealing with sequences of pointers. Works with pointer wrappers,
and filters out nullptrs, see tests.

Test Plan: Unit tests

Reviewed By: tulloch@fb.com

FB internal diff: D914069

Summary:
`apply()` returns false if and only if the handler it was //directly//
passed returned false. `Take` didn't do this right, and `Until` was just broken.

Test Plan: More thorough unit tests.

Reviewed By: kittipat@fb.com

FB internal diff: D913185

Summary: In clang (as of 3.2) intrinsics aren't `constexpr`.

Test Plan:
fbconfig folly/test:bits_test && fbmake opt -j32
fbconfig --clang folly/test:bits_test && fbmake opt -j32

Reviewed By: lucian@fb.com

FB internal diff: D910310

Summary: Convert stream of elements to stream of fixed-sized vectors.

Test Plan: unit tests

Reviewed By: tjackson@fb.com

FB internal diff: D912290

Summary: Dave Watson put this in github a few months ago.

Test Plan: None

Reviewed By: delong.j@fb.com

FB internal diff: D912681

Summary:
Threads and fork still don't mix, but we shouldn't help you shoot yourself in
the foot if you decide to do it.

Test Plan: test added

Reviewed By: mshneer@fb.com

FB internal diff: D911224

Summary: For repeating a generator's values endlessly.

Test Plan: Unit tests

Reviewed By: kittipat@fb.com

FB internal diff: D911178

Summary:
Complains about

```
In file included from crypto/lib/cpp/CryptoException.cpp:1:
In file included from crypto/lib/cpp/CryptoException.h:5:
In file included from ./folly/Conv.h:30:
./folly/Range.h:573:19: error: redefinition of default argument
Comp eq = Comp()) {
^    ~~~~~~
./folly/Range.h:55:26: note: previous definition is here
Comp eq = Comp());
^    ~~~~~~
```

Redefinition of default arguments is not allowed in C++.

Test Plan:
```
fbconfig --clang admarket/adpublisher && fbmake dbg
```

contbuild, etc.

Reviewed By: lucian@fb.com

FB internal diff: D910800

Summary:
qfind(haystack, needle) is templated, but used a non-templated
default comparator that cast everything to char.  This works find for
8-bit types, but not for others such as the uint32_t Ranges we are
using.  Replace the default comparator with std::equal<> to use a
working comparator for whatever type is being searched.

Test Plan:
Compiles, unit tests (including a new one that fails with the
old code) pass.  Not sure how to test other users of this, or measure
performance impact. :(

Reviewed By: andrei.alexandrescu@fb.com

FB internal diff: D906311

Summary: - memrchr is GNU + Linux specific, it turns out

Test Plan: - compiled on FreeBSD, contbuild

Reviewed By: delong.j@fb.com

FB internal diff: D900935

Summary:
- fix folly compilation on FreeBSD

Github Author: Martin Matuska <martin@matuska.org>

Test Plan: - compiled

Reviewed By: tudorb@fb.com

FB internal diff: D896747

Summary:
A bunch of MPMCQueues linked together. Stage i produces exactly Ki (default 1)
outputs for each input. Ordering is preserved, even though stages might
produce (intermediate or final) results in parallel and in any order; we do
this by abusing the enqueueing mechanism in MPMCQueue. (Read the code for
details)

Test Plan: test added, more tests to be written before commit

Reviewed By: ngbronson@fb.com

FB internal diff: D892388

Summary:
Like size(), sizeGuess() is allowed to return a negative value,
so it should be ssize_t instead of uint64_t.

Test Plan: fbmake, wait for contbuild

Reviewed By: tudorb@fb.com

FB internal diff: D893075

Summary:
"Wouldn't this test case still pass if the hash function didn't depend on the value?

It would be nice to verify that different tuple values produce different hash values (or maybe there's another test that verifies that), especially since this is a tricky thing to get right."

I think there's not much chance of this failing since it's just leveraging hash_combine and that's already tested. But it's easy to add another sanity check, so here we are.

Test Plan: runtests

Reviewed By: tulloch@fb.com

FB internal diff: D890448

Blame Revision: D888796

Summary:
Add hash support for std::tuple.
See also D490478 (where a first attempt was made) and D543586 (where that attempt was deemed broken and removed).

Test Plan: unit test

Reviewed By: chip@fb.com

FB internal diff: D888796

Summary:
fix OSX compat issues

Github Author: Daniel Sloof <goapsychadelic@gmail.com>

Test Plan: - compiled

Reviewed By: pt@fb.com

FB internal diff: D877309

Summary:
Apparently the templates don't like to match the initlializer
list, so this needed to be added.  This allows for things like:

auto s = join(":", {val1, val2, val3, val4, val4});

Test Plan: run tests

Reviewed By: andrei.alexandrescu@fb.com

FB internal diff: D878032

Summary:
For handling exceptions from downstream operations.

Now with cleaner build.

Test Plan: Unit tests, including those outside `folly`.

Reviewed By: marcelo.juchem@fb.com

FB internal diff: D877795

Blame Revision: https://phabricator.fb.com/D872581

Summary:
Looks like D880140 left off this part when it was committed.

This fixes the build.

Test Plan: runtests

Reviewed By: vini@fb.com

FB internal diff: D881445

Summary:
This should fix the build breakage in hphp caused by the latest fbstring changes (after being ported to engshare). Note that I'm flying blind here; I couldn't test with the hphp build because I don't have write access to engshare. @agallagher could you please make sure that this works after the fix?

fbconfig -r hphp && fbmake dbg

Test Plan: tested on folly

Reviewed By: tudorb@fb.com

FB internal diff: D880140