test_non_default_ctor.cpp

C++的一个好库。。。现在很流行

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// test_non_default_ctor.cpp

// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

// should pass compilation and execution

// this tests:
// a) non-intrusive method of implementing serialization
// b) usage of a non-default constructor

#include <fstream>
#include <cstdlib> // for rand(), remove()
#include <cmath> // for fabs()

#include <boost/config.hpp>
#if defined(BOOST_NO_STDC_NAMESPACE)
namespace std{
    using ::rand; 
    using ::fabs; 
    using ::remove;
}
#endif

#include <boost/archive/archive_exception.hpp>
#include "test_tools.hpp"
#include <boost/preprocessor/stringize.hpp>
#include BOOST_PP_STRINGIZE(BOOST_ARCHIVE_TEST)

///////////////////////////////////////////////////////
// simple class test - using non-intrusive syntax
// illustrates the usage of the non-intrusve syntax
class A
{
    friend class boost::serialization::access;

    // note const values can only be initialized with a non
    // non-default constructor
    const int i;

    signed char s;
    unsigned char t;
    signed int u;
    unsigned int v;
    float w;
    double x;
    bool operator==(const A & rhs) const;
    bool operator<(const A & rhs) const;

    template<class Archive>
    void serialize(Archive & ar,const unsigned int /* file_version */){
        ar & BOOST_SERIALIZATION_NVP(s);
        ar & BOOST_SERIALIZATION_NVP(t);
        ar & BOOST_SERIALIZATION_NVP(u);
        ar & BOOST_SERIALIZATION_NVP(v);
        ar & BOOST_SERIALIZATION_NVP(w);
        ar & BOOST_SERIALIZATION_NVP(x);
    }
public:
    static int count;
    const int & get_i() const {
        return i;
    }
    A(int i_);
    ~A();
};

int A::count = 0;

A::A(int i_) : 
    i(i_),
    s(std::rand()),
    t(std::rand()),
    u(std::rand()),
    v(std::rand()),
    w((float)std::rand() / std::rand()),
    x((double)std::rand() / std::rand())
{
    ++count;
}

A::~A(){
    --count;
}

bool A::operator==(const A &rhs) const
{
    return
        s == rhs.s 
        && t == rhs.t 
        && u == rhs.u 
        && v == rhs.v 
        && std::fabs(w - rhs.w) <= std::numeric_limits<float>::round_error()
        && std::fabs(x - rhs.x) <= std::numeric_limits<float>::round_error()
    ;
}

bool A::operator<(const A &rhs) const
{
    if(! s == rhs.s )
        return s < rhs.s;
    if(! t == rhs.t )
        return t < rhs.t;
    if(! u == rhs.u )
        return t < rhs.u; 
    if(! v == rhs.v )
        return t < rhs.v;
    if(! (std::fabs(w - rhs.w) < std::numeric_limits<float>::round_error() ) )
        return t < rhs.w; 
    if(! (std::fabs(x - rhs.x) < std::numeric_limits<float>::round_error() ) )
        return t < rhs.x;
    return false;
}

namespace boost { 
namespace serialization {

template<class Archive>
inline void save_construct_data(
    Archive & ar, 
    const A * a, 
    const unsigned int /* file_version */
){
    // variable used for construction
    ar << boost::serialization::make_nvp("i", a->get_i());
}

template<class Archive>
inline void load_construct_data(
    Archive & ar, 
    A * a, 
    const unsigned int /* file_version */
){
    int i;
    ar >> boost::serialization::make_nvp("i", i);
    ::new(a)A(i);
}

} // serialization
} // namespace boost

void save(const char * testfile){
    test_ostream os(testfile, TEST_STREAM_FLAGS);
    test_oarchive oa(os);
    A a(2);

    oa << BOOST_SERIALIZATION_NVP(a);
    
    // save a copy pointer to this item
    A *pa1 = &a;
    oa << BOOST_SERIALIZATION_NVP(pa1);

    // save pointer to a new object
    A *pa2 = new A(4);
    oa << BOOST_SERIALIZATION_NVP(pa2);

    delete pa2;
}
void load(const char * testfile){
    test_istream is(testfile, TEST_STREAM_FLAGS);
    test_iarchive ia(is);

    A a(4);
    ia >> BOOST_SERIALIZATION_NVP(a);

    A *pa1;
    ia >> BOOST_SERIALIZATION_NVP(pa1);
    BOOST_CHECK_MESSAGE(pa1 == &a, "Copy of pointer not correctly restored");

    A *pa2;
    ia >> BOOST_SERIALIZATION_NVP(pa2);
    BOOST_CHECK_MESSAGE(pa2 != &a, "Pointer not correctly restored");

    delete pa2;
}

int
test_main( int /* argc */, char* /* argv */[] )
{
    const char * testfile = boost::archive::tmpnam(NULL);
    BOOST_REQUIRE(NULL != testfile);
    save(testfile);
    load(testfile);
    BOOST_CHECK(0 == A::count);
    std::remove(testfile);
    return EXIT_SUCCESS;
}

// EOF