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Move test files to test/
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Peter Dimov
369
test/value_init_test.cpp
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369
test/value_init_test.cpp
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// Copyright 2002-2008, Fernando Luis Cacciola Carballal.
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Test program for "boost/utility/value_init.hpp"
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//
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// 21 Ago 2002 (Created) Fernando Cacciola
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// 15 Jan 2008 (Added tests regarding compiler issues) Fernando Cacciola, Niels Dekker
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// 23 May 2008 (Added tests regarding initialized_value) Niels Dekker
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// 21 Ago 2008 (Added swap test) Niels Dekker
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#include <cstring> // For memcmp.
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#include <iostream>
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#include <string>
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#include "boost/utility/value_init.hpp"
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#include <boost/shared_ptr.hpp>
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#include <boost/detail/lightweight_test.hpp>
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//
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// Sample POD type
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//
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struct POD
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{
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POD () : f(0), c(0), i(0){}
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POD ( char c_, int i_, float f_ ) : f(f_), c(c_), i(i_) {}
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friend std::ostream& operator << ( std::ostream& os, POD const& pod )
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{ return os << '(' << pod.c << ',' << pod.i << ',' << pod.f << ')' ; }
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friend bool operator == ( POD const& lhs, POD const& rhs )
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{ return lhs.f == rhs.f && lhs.c == rhs.c && lhs.i == rhs.i ; }
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float f;
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char c;
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int i;
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} ;
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//
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// Sample non POD type
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//
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struct NonPODBase
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{
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virtual ~NonPODBase() {}
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} ;
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struct NonPOD : NonPODBase
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{
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NonPOD () : id() {}
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explicit NonPOD ( std::string const& id_) : id(id_) {}
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friend std::ostream& operator << ( std::ostream& os, NonPOD const& npod )
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{ return os << '(' << npod.id << ')' ; }
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friend bool operator == ( NonPOD const& lhs, NonPOD const& rhs )
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{ return lhs.id == rhs.id ; }
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std::string id ;
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} ;
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//
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// Sample aggregate POD struct type
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// Some compilers do not correctly value-initialize such a struct, for example:
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// Borland C++ Report #51854, "Value-initialization: POD struct should be zero-initialized "
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// http://qc.codegear.com/wc/qcmain.aspx?d=51854
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//
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struct AggregatePODStruct
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{
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float f;
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char c;
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int i;
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};
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bool operator == ( AggregatePODStruct const& lhs, AggregatePODStruct const& rhs )
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{ return lhs.f == rhs.f && lhs.c == rhs.c && lhs.i == rhs.i ; }
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//
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// An aggregate struct that contains an std::string and an int.
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// Pavel Kuznetsov (MetaCommunications Engineering) used a struct like
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// this to reproduce the Microsoft Visual C++ compiler bug, reported as
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// Feedback ID 100744, "Value-initialization in new-expression"
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// https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744
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//
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struct StringAndInt
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{
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std::string s;
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int i;
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};
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bool operator == ( StringAndInt const& lhs, StringAndInt const& rhs )
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{ return lhs.s == rhs.s && lhs.i == rhs.i ; }
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//
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// A struct that has an explicit (user defined) destructor.
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// Some compilers do not correctly value-initialize such a struct, for example:
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// Microsoft Visual C++, Feedback ID 100744, "Value-initialization in new-expression"
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// https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744
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//
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struct StructWithDestructor
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{
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int i;
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~StructWithDestructor() {}
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};
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bool operator == ( StructWithDestructor const& lhs, StructWithDestructor const& rhs )
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{ return lhs.i == rhs.i ; }
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//
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// A struct that has a virtual function.
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// Some compilers do not correctly value-initialize such a struct either, for example:
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// Microsoft Visual C++, Feedback ID 100744, "Value-initialization in new-expression"
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// https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744
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//
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struct StructWithVirtualFunction
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{
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int i;
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virtual void VirtualFunction();
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};
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void StructWithVirtualFunction::VirtualFunction()
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{
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}
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bool operator == ( StructWithVirtualFunction const& lhs, StructWithVirtualFunction const& rhs )
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{ return lhs.i == rhs.i ; }
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//
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// A struct that is derived from an aggregate POD struct.
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// Some compilers do not correctly value-initialize such a struct, for example:
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// GCC Bugzilla Bug 30111, "Value-initialization of POD base class doesn't initialize members",
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// reported by Jonathan Wakely, http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30111
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//
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struct DerivedFromAggregatePODStruct : AggregatePODStruct
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{
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DerivedFromAggregatePODStruct() : AggregatePODStruct() {}
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};
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//
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// A struct that wraps an aggregate POD struct as data member.
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//
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struct AggregatePODStructWrapper
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{
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AggregatePODStructWrapper() : dataMember() {}
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AggregatePODStruct dataMember;
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};
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bool operator == ( AggregatePODStructWrapper const& lhs, AggregatePODStructWrapper const& rhs )
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{ return lhs.dataMember == rhs.dataMember ; }
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typedef unsigned char ArrayOfBytes[256];
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//
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// A struct that allows testing whether the appropriate copy functions are called.
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//
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struct CopyFunctionCallTester
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{
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bool is_copy_constructed;
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bool is_assignment_called;
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CopyFunctionCallTester()
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: is_copy_constructed(false), is_assignment_called(false) {}
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CopyFunctionCallTester(const CopyFunctionCallTester & )
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: is_copy_constructed(true), is_assignment_called(false) {}
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CopyFunctionCallTester & operator=(const CopyFunctionCallTester & )
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{
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is_assignment_called = true ;
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return *this ;
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}
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};
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//
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// A struct that allows testing whether its customized swap function is called.
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//
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struct SwapFunctionCallTester
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{
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bool is_custom_swap_called;
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int data;
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SwapFunctionCallTester()
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: is_custom_swap_called(false), data(0) {}
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SwapFunctionCallTester(const SwapFunctionCallTester & arg)
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: is_custom_swap_called(false), data(arg.data) {}
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void swap(SwapFunctionCallTester & arg)
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{
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std::swap(data, arg.data);
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is_custom_swap_called = true;
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arg.is_custom_swap_called = true;
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}
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};
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void swap(SwapFunctionCallTester & lhs, SwapFunctionCallTester & rhs)
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{
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lhs.swap(rhs);
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}
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template<class T>
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void check_initialized_value ( T const& y )
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{
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T initializedValue = boost::initialized_value ;
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BOOST_TEST ( y == initializedValue ) ;
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}
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#ifdef __BORLANDC__
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#if __BORLANDC__ == 0x582
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void check_initialized_value( NonPOD const& )
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{
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// The initialized_value check is skipped for Borland 5.82
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// and this type (NonPOD), because the following statement
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// won't compile on this particular compiler version:
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// NonPOD initializedValue = boost::initialized_value() ;
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//
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// This is caused by a compiler bug, that is fixed with a newer version
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// of the Borland compiler. The Release Notes for Delphi(R) 2007 for
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// Win32(R) and C++Builder(R) 2007 (http://dn.codegear.com/article/36575)
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// say about similar statements:
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// both of these statements now compile but under 5.82 got the error:
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// Error E2015: Ambiguity between 'V::V(const A &)' and 'V::V(const V &)'
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}
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#endif
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#endif
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//
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// This test function tests boost::value_initialized<T> for a specific type T.
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// The first argument (y) is assumed have the value of a value-initialized object.
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// Returns true on success.
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//
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template<class T>
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bool test ( T const& y, T const& z )
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{
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const int errors_before_test = boost::detail::test_errors();
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check_initialized_value(y);
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boost::value_initialized<T> x ;
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BOOST_TEST ( y == x ) ;
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BOOST_TEST ( y == boost::get(x) ) ;
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static_cast<T&>(x) = z ;
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boost::get(x) = z ;
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BOOST_TEST ( x == z ) ;
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boost::value_initialized<T> const x_c ;
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BOOST_TEST ( y == x_c ) ;
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BOOST_TEST ( y == boost::get(x_c) ) ;
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T& x_c_ref = const_cast<T&>( boost::get(x_c) ) ;
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x_c_ref = z ;
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BOOST_TEST ( x_c == z ) ;
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boost::value_initialized<T> const copy1 = x;
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BOOST_TEST ( boost::get(copy1) == boost::get(x) ) ;
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boost::value_initialized<T> copy2;
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copy2 = x;
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BOOST_TEST ( boost::get(copy2) == boost::get(x) ) ;
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boost::shared_ptr<boost::value_initialized<T> > ptr( new boost::value_initialized<T> );
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BOOST_TEST ( y == *ptr ) ;
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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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boost::value_initialized<T const> cx ;
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BOOST_TEST ( y == cx ) ;
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BOOST_TEST ( y == boost::get(cx) ) ;
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boost::value_initialized<T const> const cx_c ;
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BOOST_TEST ( y == cx_c ) ;
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BOOST_TEST ( y == boost::get(cx_c) ) ;
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#endif
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return boost::detail::test_errors() == errors_before_test ;
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}
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int main(int, char **)
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{
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BOOST_TEST ( test( 0,1234 ) ) ;
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BOOST_TEST ( test( 0.0,12.34 ) ) ;
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BOOST_TEST ( test( POD(0,0,0.0), POD('a',1234,56.78f) ) ) ;
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BOOST_TEST ( test( NonPOD( std::string() ), NonPOD( std::string("something") ) ) ) ;
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NonPOD NonPOD_object( std::string("NonPOD_object") );
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BOOST_TEST ( test<NonPOD *>( 0, &NonPOD_object ) ) ;
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AggregatePODStruct zeroInitializedAggregatePODStruct = { 0.0f, '\0', 0 };
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AggregatePODStruct nonZeroInitializedAggregatePODStruct = { 1.25f, 'a', -1 };
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BOOST_TEST ( test(zeroInitializedAggregatePODStruct, nonZeroInitializedAggregatePODStruct) );
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StringAndInt stringAndInt0;
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StringAndInt stringAndInt1;
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stringAndInt0.i = 0;
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stringAndInt1.i = 1;
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stringAndInt1.s = std::string("1");
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BOOST_TEST ( test(stringAndInt0, stringAndInt1) );
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StructWithDestructor structWithDestructor0;
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StructWithDestructor structWithDestructor1;
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structWithDestructor0.i = 0;
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structWithDestructor1.i = 1;
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BOOST_TEST ( test(structWithDestructor0, structWithDestructor1) );
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StructWithVirtualFunction structWithVirtualFunction0;
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StructWithVirtualFunction structWithVirtualFunction1;
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structWithVirtualFunction0.i = 0;
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structWithVirtualFunction1.i = 1;
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BOOST_TEST ( test(structWithVirtualFunction0, structWithVirtualFunction1) );
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DerivedFromAggregatePODStruct derivedFromAggregatePODStruct0;
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DerivedFromAggregatePODStruct derivedFromAggregatePODStruct1;
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static_cast<AggregatePODStruct &>(derivedFromAggregatePODStruct0) = zeroInitializedAggregatePODStruct;
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static_cast<AggregatePODStruct &>(derivedFromAggregatePODStruct1) = nonZeroInitializedAggregatePODStruct;
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BOOST_TEST ( test(derivedFromAggregatePODStruct0, derivedFromAggregatePODStruct1) );
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AggregatePODStructWrapper aggregatePODStructWrapper0;
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AggregatePODStructWrapper aggregatePODStructWrapper1;
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aggregatePODStructWrapper0.dataMember = zeroInitializedAggregatePODStruct;
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aggregatePODStructWrapper1.dataMember = nonZeroInitializedAggregatePODStruct;
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BOOST_TEST ( test(aggregatePODStructWrapper0, aggregatePODStructWrapper1) );
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ArrayOfBytes zeroInitializedArrayOfBytes = { 0 };
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boost::value_initialized<ArrayOfBytes> valueInitializedArrayOfBytes;
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BOOST_TEST (std::memcmp(get(valueInitializedArrayOfBytes), zeroInitializedArrayOfBytes, sizeof(ArrayOfBytes)) == 0);
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boost::value_initialized<ArrayOfBytes> valueInitializedArrayOfBytes2;
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valueInitializedArrayOfBytes2 = valueInitializedArrayOfBytes;
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BOOST_TEST (std::memcmp(get(valueInitializedArrayOfBytes), get(valueInitializedArrayOfBytes2), sizeof(ArrayOfBytes)) == 0);
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boost::value_initialized<CopyFunctionCallTester> copyFunctionCallTester1;
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BOOST_TEST ( ! get(copyFunctionCallTester1).is_copy_constructed);
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BOOST_TEST ( ! get(copyFunctionCallTester1).is_assignment_called);
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boost::value_initialized<CopyFunctionCallTester> copyFunctionCallTester2 = boost::value_initialized<CopyFunctionCallTester>(copyFunctionCallTester1);
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BOOST_TEST ( get(copyFunctionCallTester2).is_copy_constructed);
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BOOST_TEST ( ! get(copyFunctionCallTester2).is_assignment_called);
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boost::value_initialized<CopyFunctionCallTester> copyFunctionCallTester3;
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copyFunctionCallTester3 = boost::value_initialized<CopyFunctionCallTester>(copyFunctionCallTester1);
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BOOST_TEST ( ! get(copyFunctionCallTester3).is_copy_constructed);
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BOOST_TEST ( get(copyFunctionCallTester3).is_assignment_called);
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boost::value_initialized<SwapFunctionCallTester> swapFunctionCallTester1;
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boost::value_initialized<SwapFunctionCallTester> swapFunctionCallTester2;
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get(swapFunctionCallTester1).data = 1;
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get(swapFunctionCallTester2).data = 2;
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boost::swap(swapFunctionCallTester1, swapFunctionCallTester2);
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BOOST_TEST( get(swapFunctionCallTester1).data == 2 );
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BOOST_TEST( get(swapFunctionCallTester2).data == 1 );
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BOOST_TEST( get(swapFunctionCallTester1).is_custom_swap_called );
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BOOST_TEST( get(swapFunctionCallTester2).is_custom_swap_called );
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return boost::report_errors();
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}
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