1 $$ This is a pump file for generating file templates. Pump is a python 2 $$ script that is part of the Google Test suite of utilities. Description 3 $$ can be found here: 4 $$ 5 $$ http://code.google.com/p/googletest/wiki/PumpManual 6 $$ 7 8 $var MAX_ARITY = 6 9 10 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 11 // Use of this source code is governed by a BSD-style license that can be 12 // found in the LICENSE file. 13 14 #ifndef BASE_BIND_H_ 15 #define BASE_BIND_H_ 16 #pragma once 17 18 #include "base/bind_internal.h" 19 #include "base/callback_internal.h" 20 21 // See base/callback.h for how to use these functions. 22 // 23 // IMPLEMENTATION NOTE 24 // Though Bind()'s result is meant to be stored in a Callback<> type, it 25 // cannot actually return the exact type without requiring a large amount 26 // of extra template specializations. The problem is that in order to 27 // discern the correct specialization of Callback<>, Bind would need to 28 // unwrap the function signature to determine the signature's arity, and 29 // whether or not it is a method. 30 // 31 // Each unique combination of (arity, function_type, num_prebound) where 32 // function_type is one of {function, method, const_method} would require 33 // one specialization. We eventually have to do a similar number of 34 // specializations anyways in the implementation (see the FunctionTraitsN, 35 // classes). However, it is avoidable in Bind if we return the result 36 // via an indirection like we do below. 37 38 namespace base { 39 40 $range BOUND 0..MAX_ARITY 41 $for BOUND [[ 42 $range BOUND_ARG 1..BOUND 43 44 $if BOUND == 0 [[ 45 46 template <typename Sig> 47 internal::InvokerStorageHolder<internal::InvokerStorage0<Sig> > 48 Bind(Sig f) { 49 return internal::MakeInvokerStorageHolder( 50 new internal::InvokerStorage0<Sig>(f)); 51 } 52 53 ]] $else [[ 54 55 template <typename Sig, $for BOUND_ARG , [[typename P$(BOUND_ARG)]]> 56 internal::InvokerStorageHolder<internal::InvokerStorage$(BOUND)<Sig, 57 $for BOUND_ARG , [[P$(BOUND_ARG)]]> > 58 Bind(Sig f, $for BOUND_ARG , [[const P$(BOUND_ARG)& p$(BOUND_ARG)]]) { 59 return internal::MakeInvokerStorageHolder( 60 new internal::InvokerStorage$(BOUND)<Sig, [[]] 61 $for BOUND_ARG , [[P$(BOUND_ARG)]]>( 62 f, $for BOUND_ARG , [[p$(BOUND_ARG)]])); 63 } 64 65 ]] 66 67 ]] $$ for BOUND 68 69 } // namespace base 70 71 #endif // BASE_BIND_H_ 72
