googletest/include/gmock/gmock-generated-actions.h.pump

$$ -*- mode: c++; -*-
$$ This is a Pump source file.  Please use Pump to convert it to
$$ gmock-generated-variadic-actions.h.
$$
$var n = 10  $$ The maximum arity we support.
// Copyright 2007, Google Inc.
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: wan@google.com (Zhanyong Wan)

// Google Mock - a framework for writing C++ mock classes.
//
// This file implements some commonly used variadic actions.

#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_GENERATED_ACTIONS_H_
#define GMOCK_INCLUDE_GMOCK_GMOCK_GENERATED_ACTIONS_H_

#include <gmock/gmock-actions.h>
#include <gmock/internal/gmock-port.h>

namespace testing {
namespace internal {

// InvokeHelper<F> knows how to unpack an N-tuple and invoke an N-ary
// function or method with the unpacked values, where F is a function
// type that takes N arguments.
template <typename Result, typename ArgumentTuple>
class InvokeHelper;


$range i 0..n
$for i [[
$range j 1..i
$var types = [[$for j [[, typename A$j]]]]
$var as = [[$for j, [[A$j]]]]
$var args = [[$if i==0 [[]] $else [[ args]]]]
$var import = [[$if i==0 [[]] $else [[
    using ::std::tr1::get;

]]]]
$var gets = [[$for j, [[get<$(j - 1)>(args)]]]]
template <typename R$types>
class InvokeHelper<R, ::std::tr1::tuple<$as> > {
 public:
  template <typename Function>
  static R Invoke(Function function, const ::std::tr1::tuple<$as>&$args) {
$import    return function($gets);
  }

  template <class Class, typename MethodPtr>
  static R InvokeMethod(Class* obj_ptr,
                        MethodPtr method_ptr,
                        const ::std::tr1::tuple<$as>&$args) {
$import    return (obj_ptr->*method_ptr)($gets);
  }
};


]]

// Implements the Invoke(f) action.  The template argument
// FunctionImpl is the implementation type of f, which can be either a
// function pointer or a functor.  Invoke(f) can be used as an
// Action<F> as long as f's type is compatible with F (i.e. f can be
// assigned to a tr1::function<F>).
template <typename FunctionImpl>
class InvokeAction {
 public:
  // The c'tor makes a copy of function_impl (either a function
  // pointer or a functor).
  explicit InvokeAction(FunctionImpl function_impl)
      : function_impl_(function_impl) {}

  template <typename Result, typename ArgumentTuple>
  Result Perform(const ArgumentTuple& args) {
    return InvokeHelper<Result, ArgumentTuple>::Invoke(function_impl_, args);
  }
 private:
  FunctionImpl function_impl_;
};

// Implements the Invoke(object_ptr, &Class::Method) action.
template <class Class, typename MethodPtr>
class InvokeMethodAction {
 public:
  InvokeMethodAction(Class* obj_ptr, MethodPtr method_ptr)
      : obj_ptr_(obj_ptr), method_ptr_(method_ptr) {}

  template <typename Result, typename ArgumentTuple>
  Result Perform(const ArgumentTuple& args) const {
    return InvokeHelper<Result, ArgumentTuple>::InvokeMethod(
        obj_ptr_, method_ptr_, args);
  }
 private:
  Class* const obj_ptr_;
  const MethodPtr method_ptr_;
};

// A ReferenceWrapper<T> object represents a reference to type T,
// which can be either const or not.  It can be explicitly converted
// from, and implicitly converted to, a T&.  Unlike a reference,
// ReferenceWrapper<T> can be copied and can survive template type
// inference.  This is used to support by-reference arguments in the
// InvokeArgument<N>(...) action.  The idea was from "reference
// wrappers" in tr1, which we don't have in our source tree yet.
template <typename T>
class ReferenceWrapper {
 public:
  // Constructs a ReferenceWrapper<T> object from a T&.
  explicit ReferenceWrapper(T& l_value) : pointer_(&l_value) {}  // NOLINT

  // Allows a ReferenceWrapper<T> object to be implicitly converted to
  // a T&.
  operator T&() const { return *pointer_; }
 private:
  T* pointer_;
};

// CallableHelper has static methods for invoking "callables",
// i.e. function pointers and functors.  It uses overloading to
// provide a uniform interface for invoking different kinds of
// callables.  In particular, you can use:
//
//   CallableHelper<R>::Call(callable, a1, a2, ..., an)
//
// to invoke an n-ary callable, where R is its return type.  If an
// argument, say a2, needs to be passed by reference, you should write
// ByRef(a2) instead of a2 in the above expression.
template <typename R>
class CallableHelper {
 public:
  // Calls a nullary callable.
  template <typename Function>
  static R Call(Function function) { return function(); }

  // Calls a unary callable.

  // We deliberately pass a1 by value instead of const reference here
  // in case it is a C-string literal.  If we had declared the
  // parameter as 'const A1& a1' and write Call(function, "Hi"), the
  // compiler would've thought A1 is 'char[3]', which causes trouble
  // when you need to copy a value of type A1.  By declaring the
  // parameter as 'A1 a1', the compiler will correctly infer that A1
  // is 'const char*' when it sees Call(function, "Hi").
  //
  // Since this function is defined inline, the compiler can get rid
  // of the copying of the arguments.  Therefore the performance won't
  // be hurt.
  template <typename Function, typename A1>
  static R Call(Function function, A1 a1) { return function(a1); }

$range i 2..n
$for i
[[
$var arity = [[$if i==2 [[binary]] $elif i==3 [[ternary]] $else [[$i-ary]]]]

  // Calls a $arity callable.

$range j 1..i
$var typename_As = [[$for j, [[typename A$j]]]]
$var Aas = [[$for j, [[A$j a$j]]]]
$var as = [[$for j, [[a$j]]]]
$var typename_Ts = [[$for j, [[typename T$j]]]]
$var Ts = [[$for j, [[T$j]]]]
  template <typename Function, $typename_As>
  static R Call(Function function, $Aas) {
    return function($as);
  }

]]

};  // class CallableHelper

// Invokes a nullary callable argument.
template <size_t N>
class InvokeArgumentAction0 {
 public:
  template <typename Result, typename ArgumentTuple>
  static Result Perform(const ArgumentTuple& args) {
    return CallableHelper<Result>::Call(::std::tr1::get<N>(args));
  }
};

// Invokes a unary callable argument with the given argument.
template <size_t N, typename A1>
class InvokeArgumentAction1 {
 public:
  // We deliberately pass a1 by value instead of const reference here
  // in case it is a C-string literal.
  //
  // Since this function is defined inline, the compiler can get rid
  // of the copying of the arguments.  Therefore the performance won't
  // be hurt.
  explicit InvokeArgumentAction1(A1 a1) : arg1_(a1) {}

  template <typename Result, typename ArgumentTuple>
  Result Perform(const ArgumentTuple& args) {
    return CallableHelper<Result>::Call(::std::tr1::get<N>(args), arg1_);
  }
 private:
  const A1 arg1_;
};

$range i 2..n
$for i [[
$var arity = [[$if i==2 [[binary]] $elif i==3 [[ternary]] $else [[$i-ary]]]]
$range j 1..i
$var typename_As = [[$for j, [[typename A$j]]]]
$var args_ = [[$for j, [[arg$j[[]]_]]]]

// Invokes a $arity callable argument with the given arguments.
template <size_t N, $typename_As>
class InvokeArgumentAction$i {
 public:
  InvokeArgumentAction$i($for j, [[A$j a$j]]) :
      $for j, [[arg$j[[]]_(a$j)]] {}

  template <typename Result, typename ArgumentTuple>
  Result Perform(const ArgumentTuple& args) {
$if i <= 4 [[

    return CallableHelper<Result>::Call(::std::tr1::get<N>(args), $args_);

]] $else [[

    // We extract the callable to a variable before invoking it, in
    // case it is a functor passed by value and its operator() is not
    // const.
    typename ::std::tr1::tuple_element<N, ArgumentTuple>::type function =
        ::std::tr1::get<N>(args);
    return function($args_);

]]
  }
 private:
$for j [[

  const A$j arg$j[[]]_;
]]

};

]]

// An INTERNAL macro for extracting the type of a tuple field.  It's
// subject to change without notice - DO NOT USE IN USER CODE!
#define GMOCK_FIELD(Tuple, N) \
    typename ::std::tr1::tuple_element<N, Tuple>::type

$range i 1..n

// SelectArgs<Result, ArgumentTuple, k1, k2, ..., k_n>::type is the
// type of an n-ary function whose i-th (1-based) argument type is the
// k{i}-th (0-based) field of ArgumentTuple, which must be a tuple
// type, and whose return type is Result.  For example,
//   SelectArgs<int, ::std::tr1::tuple<bool, char, double, long>, 0, 3>::type
// is int(bool, long).
//
// SelectArgs<Result, ArgumentTuple, k1, k2, ..., k_n>::Select(args)
// returns the selected fields (k1, k2, ..., k_n) of args as a tuple.
// For example,
//   SelectArgs<int, ::std::tr1::tuple<bool, char, double>, 2, 0>::Select(
//       ::std::tr1::make_tuple(true, 'a', 2.5))
// returns ::std::tr1::tuple (2.5, true).
//
// The numbers in list k1, k2, ..., k_n must be >= 0, where n can be
// in the range [0, $n].  Duplicates are allowed and they don't have
// to be in an ascending or descending order.

template <typename Result, typename ArgumentTuple, $for i, [[int k$i]]>
class SelectArgs {
 public:
  typedef Result type($for i, [[GMOCK_FIELD(ArgumentTuple, k$i)]]);
  typedef typename Function<type>::ArgumentTuple SelectedArgs;
  static SelectedArgs Select(const ArgumentTuple& args) {
    using ::std::tr1::get;
    return SelectedArgs($for i, [[get<k$i>(args)]]);
  }
};


$for i [[
$range j 1..n
$range j1 1..i-1
template <typename Result, typename ArgumentTuple$for j1[[, int k$j1]]>
class SelectArgs<Result, ArgumentTuple,
                 $for j, [[$if j <= i-1 [[k$j]] $else [[-1]]]]> {
 public:
  typedef Result type($for j1, [[GMOCK_FIELD(ArgumentTuple, k$j1)]]);
  typedef typename Function<type>::ArgumentTuple SelectedArgs;
  static SelectedArgs Select(const ArgumentTuple& args) {
    using ::std::tr1::get;
    return SelectedArgs($for j1, [[get<k$j1>(args)]]);
  }
};


]]
#undef GMOCK_FIELD

$var ks = [[$for i, [[k$i]]]]

// Implements the WithArgs action.
template <typename InnerAction, $for i, [[int k$i = -1]]>
class WithArgsAction {
 public:
  explicit WithArgsAction(const InnerAction& action) : action_(action) {}

  template <typename F>
  operator Action<F>() const {
    typedef typename Function<F>::Result Result;
    typedef typename Function<F>::ArgumentTuple ArgumentTuple;
    typedef typename SelectArgs<Result, ArgumentTuple,
        $ks>::type
            InnerFunctionType;

    class Impl : public ActionInterface<F> {
     public:
      explicit Impl(const InnerAction& action) : action_(action) {}

      virtual Result Perform(const ArgumentTuple& args) {
        return action_.Perform(SelectArgs<Result, ArgumentTuple, $ks>::Select(args));
      }
     private:
      Action<InnerFunctionType> action_;
    };

    return MakeAction(new Impl(action_));
  }
 private:
  const InnerAction action_;
};

// Does two actions sequentially.  Used for implementing the DoAll(a1,
// a2, ...) action.
template <typename Action1, typename Action2>
class DoBothAction {
 public:
  DoBothAction(Action1 action1, Action2 action2)
      : action1_(action1), action2_(action2) {}

  // This template type conversion operator allows DoAll(a1, ..., a_n)
  // to be used in ANY function of compatible type.
  template <typename F>
  operator Action<F>() const {
    typedef typename Function<F>::Result Result;
    typedef typename Function<F>::ArgumentTuple ArgumentTuple;
    typedef typename Function<F>::MakeResultVoid VoidResult;

    // Implements the DoAll(...) action for a particular function type F.
    class Impl : public ActionInterface<F> {
     public:
      Impl(const Action<VoidResult>& action1, const Action<F>& action2)
          : action1_(action1), action2_(action2) {}

      virtual Result Perform(const ArgumentTuple& args) {
        action1_.Perform(args);
        return action2_.Perform(args);
      }
     private:
      const Action<VoidResult> action1_;
      const Action<F> action2_;
    };

    return Action<F>(new Impl(action1_, action2_));
  }
 private:
  Action1 action1_;
  Action2 action2_;
};

}  // namespace internal

// Various overloads for Invoke().

// Creates an action that invokes 'function_impl' with the mock
// function's arguments.
template <typename FunctionImpl>
PolymorphicAction<internal::InvokeAction<FunctionImpl> > Invoke(
    FunctionImpl function_impl) {
  return MakePolymorphicAction(
      internal::InvokeAction<FunctionImpl>(function_impl));
}

// Creates an action that invokes the given method on the given object
// with the mock function's arguments.
template <class Class, typename MethodPtr>
PolymorphicAction<internal::InvokeMethodAction<Class, MethodPtr> > Invoke(
    Class* obj_ptr, MethodPtr method_ptr) {
  return MakePolymorphicAction(
      internal::InvokeMethodAction<Class, MethodPtr>(obj_ptr, method_ptr));
}

// Creates a reference wrapper for the given L-value.  If necessary,
// you can explicitly specify the type of the reference.  For example,
// suppose 'derived' is an object of type Derived, ByRef(derived)
// would wrap a Derived&.  If you want to wrap a const Base& instead,
// where Base is a base class of Derived, just write:
//
//   ByRef<const Base>(derived)
template <typename T>
inline internal::ReferenceWrapper<T> ByRef(T& l_value) {  // NOLINT
  return internal::ReferenceWrapper<T>(l_value);
}

// Various overloads for InvokeArgument<N>().
//
// The InvokeArgument<N>(a1, a2, ..., a_k) action invokes the N-th
// (0-based) argument, which must be a k-ary callable, of the mock
// function, with arguments a1, a2, ..., a_k.
//
// Notes:
//
//   1. The arguments are passed by value by default.  If you need to
//   pass an argument by reference, wrap it inside ByRef().  For
//   example,
//
//     InvokeArgument<1>(5, string("Hello"), ByRef(foo))
//
//   passes 5 and string("Hello") by value, and passes foo by
//   reference.
//
//   2. If the callable takes an argument by reference but ByRef() is
//   not used, it will receive the reference to a copy of the value,
//   instead of the original value.  For example, when the 0-th
//   argument of the mock function takes a const string&, the action
//
//     InvokeArgument<0>(string("Hello"))
//
//   makes a copy of the temporary string("Hello") object and passes a
//   reference of the copy, instead of the original temporary object,
//   to the callable.  This makes it easy for a user to define an
//   InvokeArgument action from temporary values and have it performed
//   later.
template <size_t N>
inline PolymorphicAction<internal::InvokeArgumentAction0<N> > InvokeArgument() {
  return MakePolymorphicAction(internal::InvokeArgumentAction0<N>());
}

// We deliberately pass a1 by value instead of const reference here in
// case it is a C-string literal.  If we had declared the parameter as
// 'const A1& a1' and write InvokeArgument<0>("Hi"), the compiler
// would've thought A1 is 'char[3]', which causes trouble as the
// implementation needs to copy a value of type A1.  By declaring the
// parameter as 'A1 a1', the compiler will correctly infer that A1 is
// 'const char*' when it sees InvokeArgument<0>("Hi").
//
// Since this function is defined inline, the compiler can get rid of
// the copying of the arguments.  Therefore the performance won't be
// hurt.
template <size_t N, typename A1>
inline PolymorphicAction<internal::InvokeArgumentAction1<N, A1> >
InvokeArgument(A1 a1) {
  return MakePolymorphicAction(internal::InvokeArgumentAction1<N, A1>(a1));
}

$range i 2..n
$for i [[
$range j 1..i
$var typename_As = [[$for j, [[typename A$j]]]]
$var As = [[$for j, [[A$j]]]]
$var Aas = [[$for j, [[A$j a$j]]]]
$var as = [[$for j, [[a$j]]]]

template <size_t N, $typename_As>
inline PolymorphicAction<internal::InvokeArgumentAction$i<N, $As> >
InvokeArgument($Aas) {
  return MakePolymorphicAction(
      internal::InvokeArgumentAction$i<N, $As>($as));
}

]]

// WithoutArgs(inner_action) can be used in a mock function with a
// non-empty argument list to perform inner_action, which takes no
// argument.  In other words, it adapts an action accepting no
// argument to one that accepts (and ignores) arguments.
template <typename InnerAction>
inline internal::WithArgsAction<InnerAction>
WithoutArgs(const InnerAction& action) {
  return internal::WithArgsAction<InnerAction>(action);
}

// WithArg<k>(an_action) creates an action that passes the k-th
// (0-based) argument of the mock function to an_action and performs
// it.  It adapts an action accepting one argument to one that accepts
// multiple arguments.  For convenience, we also provide
// WithArgs<k>(an_action) (defined below) as a synonym.
template <int k, typename InnerAction>
inline internal::WithArgsAction<InnerAction, k>
WithArg(const InnerAction& action) {
  return internal::WithArgsAction<InnerAction, k>(action);
}

// WithArgs<N1, N2, ..., Nk>(an_action) creates an action that passes
// the selected arguments of the mock function to an_action and
// performs it.  It serves as an adaptor between actions with
// different argument lists.  C++ doesn't support default arguments for
// function templates, so we have to overload it.

$range i 1..n
$for i [[
$range j 1..i
template <$for j [[int k$j, ]]typename InnerAction>
inline internal::WithArgsAction<InnerAction$for j [[, k$j]]>
WithArgs(const InnerAction& action) {
  return internal::WithArgsAction<InnerAction$for j [[, k$j]]>(action);
}


]]
// Creates an action that does actions a1, a2, ..., sequentially in
// each invocation.
$range i 2..n
$for i [[
$range j 2..i
$var types = [[$for j, [[typename Action$j]]]]
$var Aas = [[$for j [[, Action$j a$j]]]]

template <typename Action1, $types>
$range k 1..i-1

inline $for k [[internal::DoBothAction<Action$k, ]]Action$i$for k  [[>]]

DoAll(Action1 a1$Aas) {
$if i==2 [[

  return internal::DoBothAction<Action1, Action2>(a1, a2);
]] $else [[
$range j2 2..i

  return DoAll(a1, DoAll($for j2, [[a$j2]]));
]]

}

]]

}  // namespace testing

#endif  // GMOCK_INCLUDE_GMOCK_GMOCK_GENERATED_ACTIONS_H_