Printf-Style Assertions using CPPUnit

Question

Does CPPUnit have any functionality that would allow me to do printf-style assertions? For example:

CPPUNIT_ASSERT("Actual size: %d", p->GetSize(), p->GetSize() == 0);

I know this is not a valid CPPUNIT_ASSERT - I am just using this as an example.

I found CPPUNIT_ASSERT_MESSAGE(message,condition) which takes a string and then the condition to evaluate but no luck getting the value into the assert.

Answer 1

You should be able to do something like this:

#define CPPUNIT_ASSERT_STREAM(MSG, CONDITION) \
    do { \
        std::ostringstream oss; \
        CPPUNIT_ASSERT_MESSAGE(\
            static_cast<std::ostringstream &>(oss << MSG).str(), \
            CONDITION); \
    } while (0)

CPPUNIT_ASSERT_STREAM("Actual size: " << p->GetSize(), p->GetSize() == 0);

The above macro can also be combined with Boost.format:

CPPUNIT_ASSERT_STREAM(boost::format("Actual size: %d") % p->GetSize(),
                      p->GetSize() == 0);