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// Copyright 2005, 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.
//
// Author: wan@google.com (Zhanyong Wan)
//
// The Google C++ Testing Framework (Google Test)
//
// This header file defines the Message class.
//
// IMPORTANT NOTE: Due to limitation of the C++ language, we have to
// leave some internal implementation details in this header file.
// They are clearly marked by comments like this:
//
// // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
//
// Such code is NOT meant to be used by a user directly, and is subject
// to CHANGE WITHOUT NOTICE. Therefore DO NOT DEPEND ON IT in a user
// program!
#ifndef GTEST_INCLUDE_GTEST_GTEST_MESSAGE_H_
#define GTEST_INCLUDE_GTEST_GTEST_MESSAGE_H_
#include <gtest/internal/gtest-string.h>
#include <gtest/internal/gtest-internal.h>
namespace testing {
// The Message class works like an ostream repeater.
//
// Typical usage:
//
// 1. You stream a bunch of values to a Message object.
// It will remember the text in a StrStream.
// 2. Then you stream the Message object to an ostream.
// This causes the text in the Message to be streamed
// to the ostream.
//
// For example;
//
// testing::Message foo;
// foo << 1 << " != " << 2;
// std::cout << foo;
//
// will print "1 != 2".
//
// Message is not intended to be inherited from. In particular, its
// destructor is not virtual.
//
// Note that StrStream behaves differently in gcc and in MSVC. You
// can stream a NULL char pointer to it in the former, but not in the
// latter (it causes an access violation if you do). The Message
// class hides this difference by treating a NULL char pointer as
// "(null)".
class Message {
private:
// The type of basic IO manipulators (endl, ends, and flush) for
// narrow streams.
typedef std::ostream& (*BasicNarrowIoManip)(std::ostream&);
public:
// Constructs an empty Message.
// We allocate the StrStream separately because it otherwise each use of
// ASSERT/EXPECT in a procedure adds over 200 bytes to the procedure's
// stack frame leading to huge stack frames in some cases; gcc does not reuse
// the stack space.
Message() : ss_(new internal::StrStream) {}
// Copy constructor.
Message(const Message& msg) : ss_(new internal::StrStream) { // NOLINT
*ss_ << msg.GetString();
}
// Constructs a Message from a C-string.
explicit Message(const char* str) : ss_(new internal::StrStream) {
*ss_ << str;
}
~Message() { delete ss_; }
#ifdef GTEST_OS_SYMBIAN
// Streams a value (either a pointer or not) to this object.
template <typename T>
inline Message& operator <<(const T& value) {
StreamHelper(typename internal::is_pointer<T>::type(), value);
return *this;
}
#else
// Streams a non-pointer value to this object.
template <typename T>
inline Message& operator <<(const T& val) {
::GTestStreamToHelper(ss_, val);
return *this;
}
// Streams a pointer value to this object.
//
// This function is an overload of the previous one. When you
// stream a pointer to a Message, this definition will be used as it
// is more specialized. (The C++ Standard, section
// [temp.func.order].) If you stream a non-pointer, then the
// previous definition will be used.
//
// The reason for this overload is that streaming a NULL pointer to
// ostream is undefined behavior. Depending on the compiler, you
// may get "0", "(nil)", "(null)", or an access violation. To
// ensure consistent result across compilers, we always treat NULL
// as "(null)".
template <typename T>
inline Message& operator <<(T* const& pointer) { // NOLINT
if (pointer == NULL) {
*ss_ << "(null)";
} else {
::GTestStreamToHelper(ss_, pointer);
}
return *this;
}
#endif // GTEST_OS_SYMBIAN
// Since the basic IO manipulators are overloaded for both narrow
// and wide streams, we have to provide this specialized definition
// of operator <<, even though its body is the same as the
// templatized version above. Without this definition, streaming
// endl or other basic IO manipulators to Message will confuse the
// compiler.
Message& operator <<(BasicNarrowIoManip val) {
*ss_ << val;
return *this;
}
// Instead of 1/0, we want to see true/false for bool values.
Message& operator <<(bool b) {
return *this << (b ? "true" : "false");
}
// These two overloads allow streaming a wide C string to a Message
// using the UTF-8 encoding.
Message& operator <<(const wchar_t* wide_c_str) {
return *this << internal::String::ShowWideCString(wide_c_str);
}
Message& operator <<(wchar_t* wide_c_str) {
return *this << internal::String::ShowWideCString(wide_c_str);
}
#if GTEST_HAS_STD_WSTRING
// Converts the given wide string to a narrow string using the UTF-8
// encoding, and streams the result to this Message object.
Message& operator <<(const ::std::wstring& wstr);
#endif // GTEST_HAS_STD_WSTRING
#if GTEST_HAS_GLOBAL_WSTRING
// Converts the given wide string to a narrow string using the UTF-8
// encoding, and streams the result to this Message object.
Message& operator <<(const ::wstring& wstr);
#endif // GTEST_HAS_GLOBAL_WSTRING
// Gets the text streamed to this object so far as a String.
// Each '\0' character in the buffer is replaced with "\\0".
//
// INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
internal::String GetString() const {
return internal::StrStreamToString(ss_);
}
private:
#ifdef GTEST_OS_SYMBIAN
// These are needed as the Nokia Symbian Compiler cannot decide between
// const T& and const T* in a function template. The Nokia compiler _can_
// decide between class template specializations for T and T*, so a
// tr1::type_traits-like is_pointer works, and we can overload on that.
template <typename T>
inline void StreamHelper(internal::true_type dummy, T* pointer) {
if (pointer == NULL) {
*ss_ << "(null)";
} else {
::GTestStreamToHelper(ss_, pointer);
}
}
template <typename T>
inline void StreamHelper(internal::false_type dummy, const T& value) {
::GTestStreamToHelper(ss_, value);
}
#endif // GTEST_OS_SYMBIAN
// We'll hold the text streamed to this object here.
internal::StrStream* const ss_;
// We declare (but don't implement) this to prevent the compiler
// from implementing the assignment operator.
void operator=(const Message&);
};
// Streams a Message to an ostream.
inline std::ostream& operator <<(std::ostream& os, const Message& sb) {
return os << sb.GetString();
}
} // namespace testing
#endif // GTEST_INCLUDE_GTEST_GTEST_MESSAGE_H_
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