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// Now, we can implement the 'printCategoryAndValue' function in terms of the
// 'printCategory' and 'printValue' helper functions:
//..
template <class TYPE>
void printCategoryAndValue(bsl::ostream& stream, const TYPE& object)
{
typedef typename
bdlat_TypeCategory::Select<TYPE>::Type TypeCategory;
printCategory(stream, TypeCategory());
stream << ": ";
printValue(stream, object, TypeCategory());
}
} // close package namespace
} // close enterprise namespace
//..
// Finally, we can exercise the 'printCategoryAndValue' function on objects
// that fall in different (non-dynamic) type categories.
//..
using namespace BloombergLP;
void runUsageExample1()
{
bsl::ostringstream oss;
int intVal = 123;
mine::printCategoryAndValue(oss, intVal);
ASSERT("Simple: 123" == oss.str());
oss.str("");
bdlb::NullableValue<int> nullableInt;
mine::printCategoryAndValue(oss, nullableInt);
ASSERT("NullableValue: NULL" == oss.str());
oss.str("");
nullableInt = 321;
mine::printCategoryAndValue(oss, nullableInt);
ASSERT("NullableValue: 321" == oss.str());
oss.str("");
bsl::vector<int> vec;
vec.push_back(123);
vec.push_back(345);
vec.push_back(987);
mine::printCategoryAndValue(oss, vec);
ASSERT("Array: [ 123 345 987 ]" == oss.str());
}
//..
//
///Example 2: Run-Time Dispatch by 'bdlat_TypeCategoryUtil'
/// - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// For run-time dispatching we can use the utility functions provided by
// 'bdlat_TypeCategoryUtil'. Suppose we wish to examine the type category and
// value of an arbitrary 'bdlat' compatible object, as we did in {Example 1}.
//
// First, we define 'mine::PrintAccessor', a functor that encapsulates the
// action to be taken:
//..
namespace BloombergLP {
namespace mine {
class PrintAccessor {
bsl::ostream *d_stream_p;
public:
PrintAccessor(bsl::ostream *stream)
: d_stream_p(stream) { ASSERT(stream); }
template <class TYPE>
int operator()(const TYPE& , bslmf::Nil )
{
*d_stream_p << "Nil";
return -1;
}
template <class TYPE>
int operator()(const TYPE& object, bdlat_TypeCategory::Array)
{
*d_stream_p << "Array" << ": ";
bdlb::PrintMethods::print(*d_stream_p, object, 0, -1);
return 0;
}
template <class TYPE>
int operator()(const TYPE& object, bdlat_TypeCategory::Choice)
{
*d_stream_p << "Choice" << ": ";
bdlb::PrintMethods::print(*d_stream_p, object, 0, -1);
return 0;
}