src/external/googletest/googlemock/include/gmock/gmock-cardinalities.h

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  30 // Author: wan@google.com (Zhanyong Wan)
  31
  32 // Google Mock - a framework for writing C++ mock classes.
  33 //
  34 // This file implements some commonly used cardinalities.  More
  35 // cardinalities can be defined by the user implementing the
  36 // CardinalityInterface interface if necessary.
  37
  38 #ifndef GMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_
  39 #define GMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_
  40
  41 #include <limits.h>
  42 #include <ostream>  // NOLINT
  43 #include "gmock/internal/gmock-port.h"
  44 #include "gtest/gtest.h"
  45
  46 namespace testing {
  47
  48 // To implement a cardinality Foo, define:
  49 //   1. a class FooCardinality that implements the
  50 //      CardinalityInterface interface, and
  51 //   2. a factory function that creates a Cardinality object from a
  52 //      const FooCardinality*.
  53 //
  54 // The two-level delegation design follows that of Matcher, providing
  55 // consistency for extension developers.  It also eases ownership
  56 // management as Cardinality objects can now be copied like plain values.
  57
  58 // The implementation of a cardinality.
  59 class CardinalityInterface {
  60  public:
  61   virtual ~CardinalityInterface() {}
  62
  63   // Conservative estimate on the lower/upper bound of the number of
  64   // calls allowed.
  65   virtual int ConservativeLowerBound() const { return 0; }
  66   virtual int ConservativeUpperBound() const { return INT_MAX; }
  67
  68   // Returns true iff call_count calls will satisfy this cardinality.
  69   virtual bool IsSatisfiedByCallCount(int call_count) const = 0;
  70
  71   // Returns true iff call_count calls will saturate this cardinality.
  72   virtual bool IsSaturatedByCallCount(int call_count) const = 0;
  73
  74   // Describes self to an ostream.
  75   virtual void DescribeTo(::std::ostream* os) const = 0;
  76 };
  77
  78 // A Cardinality is a copyable and IMMUTABLE (except by assignment)
  79 // object that specifies how many times a mock function is expected to
  80 // be called.  The implementation of Cardinality is just a linked_ptr
  81 // to const CardinalityInterface, so copying is fairly cheap.
  82 // Don't inherit from Cardinality!
  83 class GTEST_API_ Cardinality {
  84  public:
  85   // Constructs a null cardinality.  Needed for storing Cardinality
  86   // objects in STL containers.
  87   Cardinality() {}
  88
  89   // Constructs a Cardinality from its implementation.
  90   explicit Cardinality(const CardinalityInterface* impl) : impl_(impl) {}
  91
  92   // Conservative estimate on the lower/upper bound of the number of
  93   // calls allowed.
  94   int ConservativeLowerBound() const { return impl_->ConservativeLowerBound(); }
  95   int ConservativeUpperBound() const { return impl_->ConservativeUpperBound(); }
  96
  97   // Returns true iff call_count calls will satisfy this cardinality.
  98   bool IsSatisfiedByCallCount(int call_count) const {
  99     return impl_->IsSatisfiedByCallCount(call_count);
 100   }
 101
 102   // Returns true iff call_count calls will saturate this cardinality.
 103   bool IsSaturatedByCallCount(int call_count) const {
 104     return impl_->IsSaturatedByCallCount(call_count);
 105   }
 106
 107   // Returns true iff call_count calls will over-saturate this
 108   // cardinality, i.e. exceed the maximum number of allowed calls.
 109   bool IsOverSaturatedByCallCount(int call_count) const {
 110     return impl_->IsSaturatedByCallCount(call_count) &&
 111         !impl_->IsSatisfiedByCallCount(call_count);
 112   }
 113
 114   // Describes self to an ostream
 115   void DescribeTo(::std::ostream* os) const { impl_->DescribeTo(os); }
 116
 117   // Describes the given actual call count to an ostream.
 118   static void DescribeActualCallCountTo(int actual_call_count,
 119                                         ::std::ostream* os);
 120
 121  private:
 122   internal::linked_ptr<const CardinalityInterface> impl_;
 123 };
 124
 125 // Creates a cardinality that allows at least n calls.
 126 GTEST_API_ Cardinality AtLeast(int n);
 127
 128 // Creates a cardinality that allows at most n calls.
 129 GTEST_API_ Cardinality AtMost(int n);
 130
 131 // Creates a cardinality that allows any number of calls.
 132 GTEST_API_ Cardinality AnyNumber();
 133
 134 // Creates a cardinality that allows between min and max calls.
 135 GTEST_API_ Cardinality Between(int min, int max);
 136
 137 // Creates a cardinality that allows exactly n calls.
 138 GTEST_API_ Cardinality Exactly(int n);
 139
 140 // Creates a cardinality from its implementation.
 141 inline Cardinality MakeCardinality(const CardinalityInterface* c) {
 142   return Cardinality(c);
 143 }
 144
 145 }  // namespace testing
 146
 147 #endif  // GMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_