libgolang: Provide func as alias for std::function

std::function is frequently too long to type while func is more native to Go.

golang/_context.pxd

@@ -41,8 +41,8 @@ from libcpp.utility cimport pair
 # XXX for std::function cython does not provide operator() and =nullptr
 #from libcpp.functional cimport function
 #ctypedef function[void()] cancelFunc
-cdef extern from "<functional>" namespace "std" nogil:
-    cppclass cancelFunc "std::function<void()>":
+cdef extern from "golang/libgolang.h" namespace "golang" nogil:
+    cppclass cancelFunc "golang::func<void()>":
         void operator() ()
         void operator= (nullptr_t)
 

golang/_sync.pxd

@@ -37,7 +37,7 @@ cdef extern from "golang/sync.h" namespace "golang::sync" nogil:
         void unlock()
 
     cppclass Once:
-        void do "do_" (...)     # ... = std::function
+        void do "do_" (...)     # ... = func<void()>
 
     cppclass WaitGroup:
         void done()

golang/_time.pxd

@@ -59,7 +59,7 @@ cdef extern from "golang/time.h" namespace "golang::time" nogil:
 
     chan[double] tick(double dt)
     chan[double] after(double dt)
-    Timer        after_func(double dt, ...)    # ... = std::function<void()>
+    Timer        after_func(double dt, ...)    # ... = func<void()>
 
     cppclass _Ticker:
         chan[double] c

golang/context.cpp

@@ -30,7 +30,6 @@
 #include <vector>
 using std::pair;
 using std::make_pair;
-using std::function;
 using std::vector;
 
 
@@ -306,7 +305,7 @@ struct _TimeoutCtx : _CancelCtx {
 };
 
 
-pair<Context, function<void()>>
+pair<Context, func<void()>>
 with_cancel(Context parent) {
     refptr<_CancelCtx> cctx = adoptref(new _CancelCtx({parent}));
     Context            ctx  = newref  (static_cast<_Context*>(cctx._ptr()));
@@ -318,7 +317,7 @@ with_value(Context parent, const void *key, interface value) {
     return adoptref(static_cast<_Context*>(new _ValueCtx(key, value, parent)));
 }
 
-pair<Context, function<void()>>
+pair<Context, func<void()>>
 with_deadline(Context parent, double deadline) {
     // parent's deadline is before deadline -> just use parent
     double pdead = parent->deadline();
@@ -329,7 +328,7 @@ with_deadline(Context parent, double deadline) {
     double timeout = deadline - time::now();
     if (timeout <= 0) {
         Context       ctx;
-        function<void()>  cancel;
+        func<void()>  cancel;
         tie(ctx, cancel) = with_cancel(parent);
         cancel();
         return make_pair(ctx, cancel);
@@ -340,12 +339,12 @@ with_deadline(Context parent, double deadline) {
     return make_pair(ctx, [tctx]() { tctx->_cancel(canceled); });
 }
 
-pair<Context, function<void()>>
+pair<Context, func<void()>>
 with_timeout(Context parent, double timeout) {
     return with_deadline(parent, time::now() + timeout);
 }
 
-pair<Context, function<void()>>
+pair<Context, func<void()>>
 merge(Context parent1, Context parent2) {
     refptr<_CancelCtx> cctx = adoptref(new _CancelCtx({parent1, parent2}));
     Context            ctx  = newref  (static_cast<_Context*>(cctx._ptr()));

golang/context.h

@@ -78,7 +78,7 @@ extern LIBGOLANG_API const error deadlineExceeded;
 //
 // The caller should explicitly call cancel to release context resources as soon
 // the context is no longer needed.
-LIBGOLANG_API std::pair<Context, std::function<void()>>
+LIBGOLANG_API std::pair<Context, func<void()>>
     with_cancel(Context parent); // -> ctx, cancel
 
 // with_value creates new context with key=value.
@@ -96,13 +96,13 @@ LIBGOLANG_API Context
 //
 // The caller should explicitly call cancel to release context resources as soon
 // the context is no longer needed.
-LIBGOLANG_API std::pair<Context, std::function<void()>>
+LIBGOLANG_API std::pair<Context, func<void()>>
     with_deadline(Context parent, double deadline); // -> ctx, cancel
 
 // with_timeout creates new context with timeout.
 //
 // it is shorthand for with_deadline(parent, now+timeout).
-LIBGOLANG_API std::pair<Context, std::function<void()>>
+LIBGOLANG_API std::pair<Context, func<void()>>
     with_timeout(Context parent, double timeout); // -> ctx, cancel
 
 // merge merges 2 contexts into 1.
@@ -118,7 +118,7 @@ LIBGOLANG_API std::pair<Context, std::function<void()>>
 //
 // Note: on Go side merge is not part of stdlib context and is provided by
 // https://godoc.org/lab.nexedi.com/kirr/go123/xcontext#hdr-Merging_contexts
-LIBGOLANG_API std::pair<Context, std::function<void()>>
+LIBGOLANG_API std::pair<Context, func<void()>>
     merge(Context parent1, Context parent2);  // -> ctx, cancel
 
 // for testing

golang/libgolang.h

@@ -299,10 +299,14 @@ LIBGOLANG_API extern void (*_tblockforever)(void);
 
 namespace golang {
 
+// func is alias for std::function.
+template<typename F>
+using func = std::function<F>;
+
 // go provides type-safe wrapper over _taskgo.
-template<typename F, typename... Argv>  // F = std::function<void(Argv...)>
-static inline void go(F /*std::function<void(Argv...)>*/ f, Argv... argv) {
-    typedef std::function<void(void)> Frun;
+template<typename F, typename... Argv>  // F = func<void(Argv...)>
+static inline void go(F /*func<void(Argv...)>*/ f, Argv... argv) {
+    typedef func<void()> Frun;
     Frun *frun = new Frun (std::bind(f, argv...));
     _taskgo([](void *_frun) {
         std::unique_ptr<Frun> frun (reinterpret_cast<Frun*>(_frun));
@@ -452,7 +456,7 @@ int select(const std::vector<_selcase> &casev) {
 // NOTE contrary to Go f is called at end of current scope, not function.
 #define defer(f) golang::_deferred _defer_ ## __COUNTER__ (f)
 struct _deferred {
-    typedef std::function<void(void)> F;
+    typedef func<void()> F;
     F f;
 
     _deferred(F f) : f(f) {}

golang/runtime/libgolang_test.cpp

@@ -28,7 +28,6 @@
 #include <utility>
 #include <string.h>
 using namespace golang;
-using std::function;
 using std::move;
 using std::tie;
 
@@ -186,7 +185,7 @@ template<typename T> void waitBlocked_TX(chan<T> ch) {
 //    .
 //
 //    f    ->  heap
-static void usestack_and_call(function<void()> f, int nframes=128) {
+static void usestack_and_call(func<void()> f, int nframes=128) {
     if (nframes == 0) {
         f();
         return;

golang/sync.cpp

@@ -34,7 +34,7 @@ Once::Once() {
 
 Once::~Once() {}
 
-void Once::do_(const std::function<void(void)> &f) {
+void Once::do_(const func<void()> &f) {
     Once *once = this;
     once->_mu.lock();
     defer([&]() {

golang/sync.h

@@ -110,7 +110,7 @@ class Once {
 public:
     LIBGOLANG_API Once();
     LIBGOLANG_API ~Once();
-    LIBGOLANG_API void do_(const std::function<void(void)> &f);
+    LIBGOLANG_API void do_(const func<void()> &f);
 
 private:
     Once(const Once&);      // don't copy

golang/time.cpp

@@ -24,8 +24,6 @@
 
 #include <math.h>
 
-using std::function;
-
 
 // golang::time:: (except sleep and now)
 namespace golang {
@@ -36,7 +34,7 @@ namespace time {
 
 Ticker new_ticker(double dt);
 Timer  new_timer (double dt);
-Timer  _new_timer(double dt, function<void()>);
+Timer  _new_timer(double dt, func<void()>);
 
 
 chan<double> tick(double dt) {
@@ -49,7 +47,7 @@ chan<double> after(double dt) {
     return new_timer(dt)->c;
 }
 
-Timer after_func(double dt, function<void()> f) {
+Timer after_func(double dt, func<void()> f) {
     return _new_timer(dt, f);
 }
 
@@ -120,7 +118,7 @@ void _Timer::decref() {
         delete this;
 }
 
-Timer _new_timer(double dt, function<void()> f) {
+Timer _new_timer(double dt, func<void()> f) {
     Timer t = adoptref(new _Timer());
     t->c    = (f == NULL ? makechan<double>(1) : NULL);
     t->_f   = f;

golang/time.h

@@ -94,7 +94,7 @@ LIBGOLANG_API chan<double> after(double dt);
 //
 // The function will be called in its own goroutine.
 // Returned timer can be used to cancel the call.
-LIBGOLANG_API Timer after_func(double dt, std::function<void()> f);
+LIBGOLANG_API Timer after_func(double dt, func<void()> f);
 
 
 // new_ticker creates new Ticker that will be firing at dt intervals.
@@ -141,7 +141,7 @@ struct _Timer : object {
     chan<double> c;
 
 private:
-    std::function<void()>  _f;
+    func<void()> _f;
 
     sync::Mutex  _mu;
     double       _dt;  // +inf - stopped, otherwise - armed
@@ -151,7 +151,7 @@ private:
 private:
     _Timer();
     ~_Timer();
-    friend Timer _new_timer(double dt, std::function<void()> f);
+    friend Timer _new_timer(double dt, func<void()> f);
 public:
     LIBGOLANG_API void decref();