Reimplement callback.h with C++11

atom/common/native_mate_converters/callback.h

@@ -2,6 +2,8 @@
 // Use of this source code is governed by the MIT license that can be
 // found in the LICENSE file.
 
+#include <vector>
+
 #include "base/bind.h"
 #include "base/callback.h"
 #include "native_mate/function_template.h"
@@ -14,407 +16,55 @@ namespace internal {
 
 typedef scoped_refptr<RefCountedPersistent<v8::Function> > SafeV8Function;
 
-// This set of templates invokes a V8::Function by converting the C++ types.
-template<typename Sig>
-struct V8FunctionInvoker;
-
-template<typename V>
-struct V8FunctionInvoker<v8::Local<V>()> {
-  static v8::Local<V> Go(v8::Isolate* isolate, SafeV8Function function) {
-    Locker locker(isolate);
-    v8::EscapableHandleScope handle_scope(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> val(holder->Call(holder, 0, NULL));
-        return handle_scope.Escape(val);
-  }
-};
-
-template<typename R>
-struct V8FunctionInvoker<R()> {
-  static R Go(v8::Isolate* isolate, SafeV8Function function) {
-    R ret;
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> val(holder->Call(holder, 0, NULL));
-    Converter<R>::FromV8(isolate, val, &ret);
-    return ret;
-  }
-};
-
-template<>
-struct V8FunctionInvoker<void()> {
-  static void Go(v8::Isolate* isolate, SafeV8Function function) {
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    holder->Call(holder, 0, NULL);
-  }
-};
-
-template<typename V, typename P1>
-struct V8FunctionInvoker<v8::Local<V>(P1)> {
-  static v8::Local<V> Go(v8::Isolate* isolate, SafeV8Function function, P1 a1) {
-    Locker locker(isolate);
-    v8::EscapableHandleScope handle_scope(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-        return handle_scope.Escape(val);
-  }
-};
-
-template<typename R, typename P1>
-struct V8FunctionInvoker<R(P1)> {
-  static R Go(v8::Isolate* isolate, SafeV8Function function, P1 a1) {
-    R ret;
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-    Converter<R>::FromV8(isolate, val, &ret);
-    return ret;
-  }
-};
-
-template<typename P1>
-struct V8FunctionInvoker<void(P1)> {
-  static void Go(v8::Isolate* isolate, SafeV8Function function, P1 a1) {
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-    };
-    holder->Call(holder, arraysize(args), args);
-  }
-};
-
-template<typename V, typename P1, typename P2>
-struct V8FunctionInvoker<v8::Local<V>(P1, P2)> {
-  static v8::Local<V> Go(v8::Isolate* isolate, SafeV8Function function, P1 a1,
-      P2 a2) {
-    Locker locker(isolate);
-    v8::EscapableHandleScope handle_scope(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-        return handle_scope.Escape(val);
-  }
-};
-
-template<typename R, typename P1, typename P2>
-struct V8FunctionInvoker<R(P1, P2)> {
-  static R Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2) {
-    R ret;
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-    Converter<R>::FromV8(isolate, val, &ret);
-    return ret;
-  }
-};
-
-template<typename P1, typename P2>
-struct V8FunctionInvoker<void(P1, P2)> {
-  static void Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2) {
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-    };
-    holder->Call(holder, arraysize(args), args);
-  }
-};
-
-template<typename V, typename P1, typename P2, typename P3>
-struct V8FunctionInvoker<v8::Local<V>(P1, P2, P3)> {
-  static v8::Local<V> Go(v8::Isolate* isolate, SafeV8Function function, P1 a1,
-      P2 a2, P3 a3) {
-    Locker locker(isolate);
-    v8::EscapableHandleScope handle_scope(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-        return handle_scope.Escape(val);
-  }
-};
-
-template<typename R, typename P1, typename P2, typename P3>
-struct V8FunctionInvoker<R(P1, P2, P3)> {
-  static R Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3) {
-    R ret;
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-    Converter<R>::FromV8(isolate, val, &ret);
-    return ret;
-  }
-};
-
-template<typename P1, typename P2, typename P3>
-struct V8FunctionInvoker<void(P1, P2, P3)> {
-  static void Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3) {
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-    };
-    holder->Call(holder, arraysize(args), args);
-  }
-};
-
-template<typename V, typename P1, typename P2, typename P3, typename P4>
-struct V8FunctionInvoker<v8::Local<V>(P1, P2, P3, P4)> {
-  static v8::Local<V> Go(v8::Isolate* isolate, SafeV8Function function, P1 a1,
-      P2 a2, P3 a3, P4 a4) {
-    Locker locker(isolate);
-    v8::EscapableHandleScope handle_scope(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-        return handle_scope.Escape(val);
-  }
-};
-
-template<typename R, typename P1, typename P2, typename P3, typename P4>
-struct V8FunctionInvoker<R(P1, P2, P3, P4)> {
-  static R Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3, P4 a4) {
-    R ret;
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-    Converter<R>::FromV8(isolate, val, &ret);
-    return ret;
-  }
-};
-
-template<typename P1, typename P2, typename P3, typename P4>
-struct V8FunctionInvoker<void(P1, P2, P3, P4)> {
-  static void Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3, P4 a4) {
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-    };
-    holder->Call(holder, arraysize(args), args);
-  }
-};
+template <typename Sig>
+struct V8FunctionInvoker {};
 
-template<typename V, typename P1, typename P2, typename P3, typename P4,
-    typename P5>
-struct V8FunctionInvoker<v8::Local<V>(P1, P2, P3, P4, P5)> {
-  static v8::Local<V> Go(v8::Isolate* isolate, SafeV8Function function, P1 a1,
-      P2 a2, P3 a3, P4 a4, P5 a5) {
+template <typename... ArgTypes>
+struct V8FunctionInvoker<v8::Local<v8::Value>(ArgTypes...)> {
+  static v8::Local<v8::Value> Go(v8::Isolate* isolate, SafeV8Function function,
+                                 ArgTypes... raw) {
     Locker locker(isolate);
     v8::EscapableHandleScope handle_scope(isolate);
     v8::Local<v8::Function> holder = function->NewHandle();
     v8::Local<v8::Context> context = holder->CreationContext();
     v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-        ConvertToV8(isolate, a5),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-        return handle_scope.Escape(val);
+    std::vector<v8::Local<v8::Value>> args = { ConvertToV8(isolate, raw)... };
+    v8::Local<v8::Value> ret(holder->Call(holder, args.size(), &args.front()));
+    return handle_scope.Escape(ret);
   }
 };
 
-template<typename R, typename P1, typename P2, typename P3, typename P4,
-    typename P5>
-struct V8FunctionInvoker<R(P1, P2, P3, P4, P5)> {
-  static R Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3, P4 a4, P5 a5) {
-    R ret;
+template <typename... ArgTypes>
+struct V8FunctionInvoker<void(ArgTypes...)> {
+  static void Go(v8::Isolate* isolate, SafeV8Function function,
+                 ArgTypes... raw) {
     Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
+    v8::HandleScope handle_scope(isolate);
     v8::Local<v8::Function> holder = function->NewHandle();
     v8::Local<v8::Context> context = holder->CreationContext();
     v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-        ConvertToV8(isolate, a5),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-    Converter<R>::FromV8(isolate, val, &ret);
-    return ret;
+    std::vector<v8::Local<v8::Value>> args = { ConvertToV8(isolate, raw)... };
+    holder->Call(holder, args.size(), &args.front());
   }
 };
 
-template<typename P1, typename P2, typename P3, typename P4, typename P5>
-struct V8FunctionInvoker<void(P1, P2, P3, P4, P5)> {
-  static void Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3, P4 a4, P5 a5) {
+template <typename ReturnType, typename... ArgTypes>
+struct V8FunctionInvoker<ReturnType(ArgTypes...)> {
+  static ReturnType Go(v8::Isolate* isolate, SafeV8Function function,
+                       ArgTypes... raw) {
     Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
+    v8::HandleScope handle_scope(isolate);
     v8::Local<v8::Function> holder = function->NewHandle();
     v8::Local<v8::Context> context = holder->CreationContext();
     v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-        ConvertToV8(isolate, a5),
-    };
-    holder->Call(holder, arraysize(args), args);
-  }
-};
-
-template<typename V, typename P1, typename P2, typename P3, typename P4,
-    typename P5, typename P6>
-struct V8FunctionInvoker<v8::Local<V>(P1, P2, P3, P4, P5, P6)> {
-  static v8::Local<V> Go(v8::Isolate* isolate, SafeV8Function function, P1 a1,
-      P2 a2, P3 a3, P4 a4, P5 a5, P6 a6) {
-    Locker locker(isolate);
-    v8::EscapableHandleScope handle_scope(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-        ConvertToV8(isolate, a5),
-        ConvertToV8(isolate, a6),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-        return handle_scope.Escape(val);
-  }
-};
-
-template<typename R, typename P1, typename P2, typename P3, typename P4,
-    typename P5, typename P6>
-struct V8FunctionInvoker<R(P1, P2, P3, P4, P5, P6)> {
-  static R Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3, P4 a4, P5 a5, P6 a6) {
-    R ret;
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-        ConvertToV8(isolate, a5),
-        ConvertToV8(isolate, a6),
-    };
-    v8::Local<v8::Value> val(holder->Call(holder, arraysize(args), args));
-    Converter<R>::FromV8(isolate, val, &ret);
+    ReturnType ret;
+    std::vector<v8::Local<v8::Value>> args = { ConvertToV8(isolate, raw)... };
+    v8::Local<v8::Value> val(holder->Call(holder, args.size(), &args.front()));
+    Converter<ReturnType>::FromV8(isolate, val, &ret);
     return ret;
   }
 };
 
-template<typename P1, typename P2, typename P3, typename P4, typename P5,
-    typename P6>
-struct V8FunctionInvoker<void(P1, P2, P3, P4, P5, P6)> {
-  static void Go(v8::Isolate* isolate, SafeV8Function function, P1 a1, P2 a2,
-      P3 a3, P4 a4, P5 a5, P6 a6) {
-    Locker locker(isolate);
-    MATE_HANDLE_SCOPE(isolate);
-    v8::Local<v8::Function> holder = function->NewHandle();
-    v8::Local<v8::Context> context = holder->CreationContext();
-    v8::Context::Scope context_scope(context);
-    v8::Local<v8::Value> args[] = {
-        ConvertToV8(isolate, a1),
-        ConvertToV8(isolate, a2),
-        ConvertToV8(isolate, a3),
-        ConvertToV8(isolate, a4),
-        ConvertToV8(isolate, a5),
-        ConvertToV8(isolate, a6),
-    };
-    holder->Call(holder, arraysize(args), args);
-  }
-};
-
 }  // namespace internal
 
 template<typename Sig>