googletest/googlemock/include/gmock/internal/gmock-internal-utils.h
Abseil Team 611a321a6e Googletest export
Remove bool_constant in favor of std::integral_constant<bool, ...>;
The one non-trivial use of bool_constant has been changed to have significantly
fewer template specializations.

PiperOrigin-RevId: 275842490
2019-10-22 09:38:12 -04:00

473 lines
18 KiB
C++

// Copyright 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// 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.
// Google Mock - a framework for writing C++ mock classes.
//
// This file defines some utilities useful for implementing Google
// Mock. They are subject to change without notice, so please DO NOT
// USE THEM IN USER CODE.
// GOOGLETEST_CM0002 DO NOT DELETE
#ifndef GMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_INTERNAL_UTILS_H_
#define GMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_INTERNAL_UTILS_H_
#include <stdio.h>
#include <ostream> // NOLINT
#include <string>
#include <type_traits>
#include "gmock/internal/gmock-port.h"
#include "gtest/gtest.h"
namespace testing {
template <typename>
class Matcher;
namespace internal {
// Silence MSVC C4100 (unreferenced formal parameter) and
// C4805('==': unsafe mix of type 'const int' and type 'const bool')
#ifdef _MSC_VER
# pragma warning(push)
# pragma warning(disable:4100)
# pragma warning(disable:4805)
#endif
// Joins a vector of strings as if they are fields of a tuple; returns
// the joined string.
GTEST_API_ std::string JoinAsTuple(const Strings& fields);
// Converts an identifier name to a space-separated list of lower-case
// words. Each maximum substring of the form [A-Za-z][a-z]*|\d+ is
// treated as one word. For example, both "FooBar123" and
// "foo_bar_123" are converted to "foo bar 123".
GTEST_API_ std::string ConvertIdentifierNameToWords(const char* id_name);
// PointeeOf<Pointer>::type is the type of a value pointed to by a
// Pointer, which can be either a smart pointer or a raw pointer. The
// following default implementation is for the case where Pointer is a
// smart pointer.
template <typename Pointer>
struct PointeeOf {
// Smart pointer classes define type element_type as the type of
// their pointees.
typedef typename Pointer::element_type type;
};
// This specialization is for the raw pointer case.
template <typename T>
struct PointeeOf<T*> { typedef T type; }; // NOLINT
// GetRawPointer(p) returns the raw pointer underlying p when p is a
// smart pointer, or returns p itself when p is already a raw pointer.
// The following default implementation is for the smart pointer case.
template <typename Pointer>
inline const typename Pointer::element_type* GetRawPointer(const Pointer& p) {
return p.get();
}
// This overloaded version is for the raw pointer case.
template <typename Element>
inline Element* GetRawPointer(Element* p) { return p; }
// MSVC treats wchar_t as a native type usually, but treats it as the
// same as unsigned short when the compiler option /Zc:wchar_t- is
// specified. It defines _NATIVE_WCHAR_T_DEFINED symbol when wchar_t
// is a native type.
#if defined(_MSC_VER) && !defined(_NATIVE_WCHAR_T_DEFINED)
// wchar_t is a typedef.
#else
# define GMOCK_WCHAR_T_IS_NATIVE_ 1
#endif
// In what follows, we use the term "kind" to indicate whether a type
// is bool, an integer type (excluding bool), a floating-point type,
// or none of them. This categorization is useful for determining
// when a matcher argument type can be safely converted to another
// type in the implementation of SafeMatcherCast.
enum TypeKind {
kBool, kInteger, kFloatingPoint, kOther
};
// KindOf<T>::value is the kind of type T.
template <typename T> struct KindOf {
enum { value = kOther }; // The default kind.
};
// This macro declares that the kind of 'type' is 'kind'.
#define GMOCK_DECLARE_KIND_(type, kind) \
template <> struct KindOf<type> { enum { value = kind }; }
GMOCK_DECLARE_KIND_(bool, kBool);
// All standard integer types.
GMOCK_DECLARE_KIND_(char, kInteger);
GMOCK_DECLARE_KIND_(signed char, kInteger);
GMOCK_DECLARE_KIND_(unsigned char, kInteger);
GMOCK_DECLARE_KIND_(short, kInteger); // NOLINT
GMOCK_DECLARE_KIND_(unsigned short, kInteger); // NOLINT
GMOCK_DECLARE_KIND_(int, kInteger);
GMOCK_DECLARE_KIND_(unsigned int, kInteger);
GMOCK_DECLARE_KIND_(long, kInteger); // NOLINT
GMOCK_DECLARE_KIND_(unsigned long, kInteger); // NOLINT
#if GMOCK_WCHAR_T_IS_NATIVE_
GMOCK_DECLARE_KIND_(wchar_t, kInteger);
#endif
// Non-standard integer types.
GMOCK_DECLARE_KIND_(Int64, kInteger);
GMOCK_DECLARE_KIND_(UInt64, kInteger);
// All standard floating-point types.
GMOCK_DECLARE_KIND_(float, kFloatingPoint);
GMOCK_DECLARE_KIND_(double, kFloatingPoint);
GMOCK_DECLARE_KIND_(long double, kFloatingPoint);
#undef GMOCK_DECLARE_KIND_
// Evaluates to the kind of 'type'.
#define GMOCK_KIND_OF_(type) \
static_cast< ::testing::internal::TypeKind>( \
::testing::internal::KindOf<type>::value)
// LosslessArithmeticConvertibleImpl<kFromKind, From, kToKind, To>::value
// is true if and only if arithmetic type From can be losslessly converted to
// arithmetic type To.
//
// It's the user's responsibility to ensure that both From and To are
// raw (i.e. has no CV modifier, is not a pointer, and is not a
// reference) built-in arithmetic types, kFromKind is the kind of
// From, and kToKind is the kind of To; the value is
// implementation-defined when the above pre-condition is violated.
template <TypeKind kFromKind, typename From, TypeKind kToKind, typename To>
using LosslessArithmeticConvertibleImpl = std::integral_constant<
bool,
// clang-format off
// Converting from bool is always lossless
(kFromKind == kBool) ? true
// Converting between any other type kinds will be lossy if the type
// kinds are not the same.
: (kFromKind != kToKind) ? false
: (kFromKind == kInteger &&
// Converting between integers of different widths is allowed so long
// as the conversion does not go from signed to unsigned.
(((sizeof(From) < sizeof(To)) &&
!(std::is_signed<From>::value && !std::is_signed<To>::value)) ||
// Converting between integers of the same width only requires the
// two types to have the same signedness.
((sizeof(From) == sizeof(To)) &&
(std::is_signed<From>::value == std::is_signed<To>::value)))
) ? true
// Floating point conversions are lossless if and only if `To` is at least
// as wide as `From`.
: (kFromKind == kFloatingPoint && (sizeof(From) <= sizeof(To))) ? true
: false
// clang-format on
>;
// LosslessArithmeticConvertible<From, To>::value is true if and only if
// arithmetic type From can be losslessly converted to arithmetic type To.
//
// It's the user's responsibility to ensure that both From and To are
// raw (i.e. has no CV modifier, is not a pointer, and is not a
// reference) built-in arithmetic types; the value is
// implementation-defined when the above pre-condition is violated.
template <typename From, typename To>
using LosslessArithmeticConvertible =
LosslessArithmeticConvertibleImpl<GMOCK_KIND_OF_(From), From,
GMOCK_KIND_OF_(To), To>;
// This interface knows how to report a Google Mock failure (either
// non-fatal or fatal).
class FailureReporterInterface {
public:
// The type of a failure (either non-fatal or fatal).
enum FailureType {
kNonfatal, kFatal
};
virtual ~FailureReporterInterface() {}
// Reports a failure that occurred at the given source file location.
virtual void ReportFailure(FailureType type, const char* file, int line,
const std::string& message) = 0;
};
// Returns the failure reporter used by Google Mock.
GTEST_API_ FailureReporterInterface* GetFailureReporter();
// Asserts that condition is true; aborts the process with the given
// message if condition is false. We cannot use LOG(FATAL) or CHECK()
// as Google Mock might be used to mock the log sink itself. We
// inline this function to prevent it from showing up in the stack
// trace.
inline void Assert(bool condition, const char* file, int line,
const std::string& msg) {
if (!condition) {
GetFailureReporter()->ReportFailure(FailureReporterInterface::kFatal,
file, line, msg);
}
}
inline void Assert(bool condition, const char* file, int line) {
Assert(condition, file, line, "Assertion failed.");
}
// Verifies that condition is true; generates a non-fatal failure if
// condition is false.
inline void Expect(bool condition, const char* file, int line,
const std::string& msg) {
if (!condition) {
GetFailureReporter()->ReportFailure(FailureReporterInterface::kNonfatal,
file, line, msg);
}
}
inline void Expect(bool condition, const char* file, int line) {
Expect(condition, file, line, "Expectation failed.");
}
// Severity level of a log.
enum LogSeverity {
kInfo = 0,
kWarning = 1
};
// Valid values for the --gmock_verbose flag.
// All logs (informational and warnings) are printed.
const char kInfoVerbosity[] = "info";
// Only warnings are printed.
const char kWarningVerbosity[] = "warning";
// No logs are printed.
const char kErrorVerbosity[] = "error";
// Returns true if and only if a log with the given severity is visible
// according to the --gmock_verbose flag.
GTEST_API_ bool LogIsVisible(LogSeverity severity);
// Prints the given message to stdout if and only if 'severity' >= the level
// specified by the --gmock_verbose flag. If stack_frames_to_skip >=
// 0, also prints the stack trace excluding the top
// stack_frames_to_skip frames. In opt mode, any positive
// stack_frames_to_skip is treated as 0, since we don't know which
// function calls will be inlined by the compiler and need to be
// conservative.
GTEST_API_ void Log(LogSeverity severity, const std::string& message,
int stack_frames_to_skip);
// A marker class that is used to resolve parameterless expectations to the
// correct overload. This must not be instantiable, to prevent client code from
// accidentally resolving to the overload; for example:
//
// ON_CALL(mock, Method({}, nullptr))...
//
class WithoutMatchers {
private:
WithoutMatchers() {}
friend GTEST_API_ WithoutMatchers GetWithoutMatchers();
};
// Internal use only: access the singleton instance of WithoutMatchers.
GTEST_API_ WithoutMatchers GetWithoutMatchers();
// Disable MSVC warnings for infinite recursion, since in this case the
// the recursion is unreachable.
#ifdef _MSC_VER
# pragma warning(push)
# pragma warning(disable:4717)
#endif
// Invalid<T>() is usable as an expression of type T, but will terminate
// the program with an assertion failure if actually run. This is useful
// when a value of type T is needed for compilation, but the statement
// will not really be executed (or we don't care if the statement
// crashes).
template <typename T>
inline T Invalid() {
Assert(false, "", -1, "Internal error: attempt to return invalid value");
// This statement is unreachable, and would never terminate even if it
// could be reached. It is provided only to placate compiler warnings
// about missing return statements.
return Invalid<T>();
}
#ifdef _MSC_VER
# pragma warning(pop)
#endif
// Given a raw type (i.e. having no top-level reference or const
// modifier) RawContainer that's either an STL-style container or a
// native array, class StlContainerView<RawContainer> has the
// following members:
//
// - type is a type that provides an STL-style container view to
// (i.e. implements the STL container concept for) RawContainer;
// - const_reference is a type that provides a reference to a const
// RawContainer;
// - ConstReference(raw_container) returns a const reference to an STL-style
// container view to raw_container, which is a RawContainer.
// - Copy(raw_container) returns an STL-style container view of a
// copy of raw_container, which is a RawContainer.
//
// This generic version is used when RawContainer itself is already an
// STL-style container.
template <class RawContainer>
class StlContainerView {
public:
typedef RawContainer type;
typedef const type& const_reference;
static const_reference ConstReference(const RawContainer& container) {
static_assert(!std::is_const<RawContainer>::value,
"RawContainer type must not be const");
return container;
}
static type Copy(const RawContainer& container) { return container; }
};
// This specialization is used when RawContainer is a native array type.
template <typename Element, size_t N>
class StlContainerView<Element[N]> {
public:
typedef typename std::remove_const<Element>::type RawElement;
typedef internal::NativeArray<RawElement> type;
// NativeArray<T> can represent a native array either by value or by
// reference (selected by a constructor argument), so 'const type'
// can be used to reference a const native array. We cannot
// 'typedef const type& const_reference' here, as that would mean
// ConstReference() has to return a reference to a local variable.
typedef const type const_reference;
static const_reference ConstReference(const Element (&array)[N]) {
static_assert(std::is_same<Element, RawElement>::value,
"Element type must not be const");
return type(array, N, RelationToSourceReference());
}
static type Copy(const Element (&array)[N]) {
return type(array, N, RelationToSourceCopy());
}
};
// This specialization is used when RawContainer is a native array
// represented as a (pointer, size) tuple.
template <typename ElementPointer, typename Size>
class StlContainerView< ::std::tuple<ElementPointer, Size> > {
public:
typedef typename std::remove_const<
typename internal::PointeeOf<ElementPointer>::type>::type RawElement;
typedef internal::NativeArray<RawElement> type;
typedef const type const_reference;
static const_reference ConstReference(
const ::std::tuple<ElementPointer, Size>& array) {
return type(std::get<0>(array), std::get<1>(array),
RelationToSourceReference());
}
static type Copy(const ::std::tuple<ElementPointer, Size>& array) {
return type(std::get<0>(array), std::get<1>(array), RelationToSourceCopy());
}
};
// The following specialization prevents the user from instantiating
// StlContainer with a reference type.
template <typename T> class StlContainerView<T&>;
// A type transform to remove constness from the first part of a pair.
// Pairs like that are used as the value_type of associative containers,
// and this transform produces a similar but assignable pair.
template <typename T>
struct RemoveConstFromKey {
typedef T type;
};
// Partially specialized to remove constness from std::pair<const K, V>.
template <typename K, typename V>
struct RemoveConstFromKey<std::pair<const K, V> > {
typedef std::pair<K, V> type;
};
// Emit an assertion failure due to incorrect DoDefault() usage. Out-of-lined to
// reduce code size.
GTEST_API_ void IllegalDoDefault(const char* file, int line);
template <typename F, typename Tuple, size_t... Idx>
auto ApplyImpl(F&& f, Tuple&& args, IndexSequence<Idx...>) -> decltype(
std::forward<F>(f)(std::get<Idx>(std::forward<Tuple>(args))...)) {
return std::forward<F>(f)(std::get<Idx>(std::forward<Tuple>(args))...);
}
// Apply the function to a tuple of arguments.
template <typename F, typename Tuple>
auto Apply(F&& f, Tuple&& args)
-> decltype(ApplyImpl(std::forward<F>(f), std::forward<Tuple>(args),
MakeIndexSequence<std::tuple_size<Tuple>::value>())) {
return ApplyImpl(std::forward<F>(f), std::forward<Tuple>(args),
MakeIndexSequence<std::tuple_size<Tuple>::value>());
}
// Template struct Function<F>, where F must be a function type, contains
// the following typedefs:
//
// Result: the function's return type.
// Arg<N>: the type of the N-th argument, where N starts with 0.
// ArgumentTuple: the tuple type consisting of all parameters of F.
// ArgumentMatcherTuple: the tuple type consisting of Matchers for all
// parameters of F.
// MakeResultVoid: the function type obtained by substituting void
// for the return type of F.
// MakeResultIgnoredValue:
// the function type obtained by substituting Something
// for the return type of F.
template <typename T>
struct Function;
template <typename R, typename... Args>
struct Function<R(Args...)> {
using Result = R;
static constexpr size_t ArgumentCount = sizeof...(Args);
template <size_t I>
using Arg = ElemFromList<I, Args...>;
using ArgumentTuple = std::tuple<Args...>;
using ArgumentMatcherTuple = std::tuple<Matcher<Args>...>;
using MakeResultVoid = void(Args...);
using MakeResultIgnoredValue = IgnoredValue(Args...);
};
template <typename R, typename... Args>
constexpr size_t Function<R(Args...)>::ArgumentCount;
#ifdef _MSC_VER
# pragma warning(pop)
#endif
} // namespace internal
} // namespace testing
#endif // GMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_INTERNAL_UTILS_H_