[test] User objects with BOOST_CHECK_EQUAL
Hi,
I'm having a bit of trouble getting user-defined objects working with
Boost.Test. I skimmed through the docs and I didn't see anything on this
subject, but the boost documentation isn't the most intuitive documentation,
so it is a bit easy to miss obvious stuff like this.
Anyway, I have a class named "Foo", and I've given it an overloaded boolean
== operator. When I do the following, it fails to compile under MSVC9:
Foo a, b;
BOOST_TEST_EQUAL( a, b );
The class is defined as follows:
class Foo
{
private:
std::string data;
public:
Foo()
: data( "Testing 123" )
{}
Foo( Foo const& other )
{
data = other.data;
}
bool operator== ( Foo const& operand )
{
return data == operand.data;
}
};
Below is the error I'm getting. How can I make this work? I've truncated it
a little bit since it's insanely long:
1>c:\it\tfs\crusades\sdks\boost\boost\test\test_tools.hpp(342) : error
C2679: binary '<<' : no operator found which takes a right-hand operand of
type 'const Foo' (or there is no acceptable conversion)
1> c:\program files\microsoft visual studio
9.0\vc\include\ostream(653): could be 'std::basic_ostream<_Elem,_Traits>
&std::operator
<<
Robert Dailey wrote: [snip]
Anyway, I have a class named "Foo", and I've given it an overloaded boolean == operator. When I do the following, it fails to compile under MSVC9:
Dude, read the error: [snip]
1>c:\it\tfs\crusades\sdks\boost\boost\test\test_tools.hpp(342) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const Foo' (or there is no acceptable conversion)
No operator<< not ==. Boost test has something like this for CHECK_EQUAL(a,b): if(a!=b) { cout << "omg a!=b [a=" << a << ", b=" << b << "]" } -- Sohail Somani http://uint32t.blogspot.com
Yes, the streaming operator I ended up trying and it worked (after I
posted), but one thing I left out in my original post was the fact that I
had an overloaded casting operator to std::string, which I figured would fix
the issue just as well as the stream operator would. I was wrong, and that
is what motivated me originally to post.
As far as this problem is concerned, however, it's solved.
On Fri, May 2, 2008 at 3:36 PM, Sohail Somani
Robert Dailey wrote: [snip]
Anyway, I have a class named "Foo", and I've given it an overloaded boolean == operator. When I do the following, it fails to compile under MSVC9:
Dude, read the error:
[snip]
1>c:\it\tfs\crusades\sdks\boost\boost\test\test_tools.hpp(342) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const Foo' (or there is no acceptable conversion)
No operator<< not ==. Boost test has something like this for CHECK_EQUAL(a,b):
if(a!=b) { cout << "omg a!=b [a=" << a << ", b=" << b << "]" }
-- Sohail Somani http://uint32t.blogspot.com _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
I believe template resolution rules prohibit implicit conversion. You need to define operator<<, or use BOOST_TEST_DONT_PRINT_LOG_VALUE( Foo );
Gennadiy
"Robert Dailey"
On Fri, May 02, 2008 at 02:54:19PM -0500, Robert Dailey wrote:
I'm having a bit of trouble getting user-defined objects working with Boost.Test. I skimmed through the docs and I didn't see anything on this subject, but the boost documentation isn't the most intuitive documentation, so it is a bit easy to miss obvious stuff like this.
Hopefully you read the current docs, the one on www.boost.org is outdated but not yet replaced.
Anyway, I have a class named "Foo", and I've given it an overloaded boolean == operator. When I do the following, it fails to compile under MSVC9:
The class is defined as follows:
class Foo { bool operator== ( Foo const& operand )
You should make this operator a const one. This isn't your problem but ... bool operator== ( Foo const& operand ) const
{ return data == operand.data; } };
Jens
participants (4)
-
Gennadiy Rozental -
Jens Seidel -
Robert Dailey -
Sohail Somani