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29
30// Google Mock - a framework for writing C++ mock classes.
31//
32// This file implements some commonly used cardinalities.  More
33// cardinalities can be defined by the user implementing the
34// CardinalityInterface interface if necessary.
35
36// IWYU pragma: private, include "gmock/gmock.h"
37// IWYU pragma: friend gmock/.*
38
39#ifndef GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_
40#define GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_
41
42#include <limits.h>
43
44#include <memory>
45#include <ostream>  // NOLINT
46
47#include "gmock/internal/gmock-port.h"
48#include "gtest/gtest.h"
49
50GTEST_DISABLE_MSC_WARNINGS_PUSH_(4251 \
51/* class A needs to have dll-interface to be used by clients of class B */)
52
53namespace testing {
54
55// To implement a cardinality Foo, define:
56//   1. a class FooCardinality that implements the
57//      CardinalityInterface interface, and
58//   2. a factory function that creates a Cardinality object from a
59//      const FooCardinality*.
60//
61// The two-level delegation design follows that of Matcher, providing
62// consistency for extension developers.  It also eases ownership
63// management as Cardinality objects can now be copied like plain values.
64
65// The implementation of a cardinality.
66class CardinalityInterface {
67 public:
68  virtual ~CardinalityInterface() {}
69
70  // Conservative estimate on the lower/upper bound of the number of
71  // calls allowed.
72  virtual int ConservativeLowerBound() const { return 0; }
73  virtual int ConservativeUpperBound() const { return INT_MAX; }
74
75  // Returns true if and only if call_count calls will satisfy this
76  // cardinality.
77  virtual bool IsSatisfiedByCallCount(int call_count) const = 0;
78
79  // Returns true if and only if call_count calls will saturate this
80  // cardinality.
81  virtual bool IsSaturatedByCallCount(int call_count) const = 0;
82
83  // Describes self to an ostream.
84  virtual void DescribeTo(::std::ostream* os) const = 0;
85};
86
87// A Cardinality is a copyable and IMMUTABLE (except by assignment)
88// object that specifies how many times a mock function is expected to
89// be called.  The implementation of Cardinality is just a std::shared_ptr
90// to const CardinalityInterface. Don't inherit from Cardinality!
91class GTEST_API_ Cardinality {
92 public:
93  // Constructs a null cardinality.  Needed for storing Cardinality
94  // objects in STL containers.
95  Cardinality() {}
96
97  // Constructs a Cardinality from its implementation.
98  explicit Cardinality(const CardinalityInterface* impl) : impl_(impl) {}
99
100  // Conservative estimate on the lower/upper bound of the number of
101  // calls allowed.
102  int ConservativeLowerBound() const { return impl_->ConservativeLowerBound(); }
103  int ConservativeUpperBound() const { return impl_->ConservativeUpperBound(); }
104
105  // Returns true if and only if call_count calls will satisfy this
106  // cardinality.
107  bool IsSatisfiedByCallCount(int call_count) const {
108    return impl_->IsSatisfiedByCallCount(call_count);
109  }
110
111  // Returns true if and only if call_count calls will saturate this
112  // cardinality.
113  bool IsSaturatedByCallCount(int call_count) const {
114    return impl_->IsSaturatedByCallCount(call_count);
115  }
116
117  // Returns true if and only if call_count calls will over-saturate this
118  // cardinality, i.e. exceed the maximum number of allowed calls.
119  bool IsOverSaturatedByCallCount(int call_count) const {
120    return impl_->IsSaturatedByCallCount(call_count) &&
121           !impl_->IsSatisfiedByCallCount(call_count);
122  }
123
124  // Describes self to an ostream
125  void DescribeTo(::std::ostream* os) const { impl_->DescribeTo(os); }
126
127  // Describes the given actual call count to an ostream.
128  static void DescribeActualCallCountTo(int actual_call_count,
129                                        ::std::ostream* os);
130
131 private:
132  std::shared_ptr<const CardinalityInterface> impl_;
133};
134
135// Creates a cardinality that allows at least n calls.
136GTEST_API_ Cardinality AtLeast(int n);
137
138// Creates a cardinality that allows at most n calls.
139GTEST_API_ Cardinality AtMost(int n);
140
141// Creates a cardinality that allows any number of calls.
142GTEST_API_ Cardinality AnyNumber();
143
144// Creates a cardinality that allows between min and max calls.
145GTEST_API_ Cardinality Between(int min, int max);
146
147// Creates a cardinality that allows exactly n calls.
148GTEST_API_ Cardinality Exactly(int n);
149
150// Creates a cardinality from its implementation.
151inline Cardinality MakeCardinality(const CardinalityInterface* c) {
152  return Cardinality(c);
153}
154
155}  // namespace testing
156
157GTEST_DISABLE_MSC_WARNINGS_POP_()  //  4251
158
159#endif  // GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_
160