157 lines
5 KiB
C++
157 lines
5 KiB
C++
/*
|
|
FormatCOUT(Test) - validate automatic string conversion in output
|
|
|
|
Copyright (C) Lumiera.org
|
|
2016, Hermann Vosseler <Ichthyostega@web.de>
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License as
|
|
published by the Free Software Foundation; either version 2 of
|
|
the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
* *****************************************************/
|
|
|
|
/** @file format-cout-test.cpp
|
|
** unit test \ref FormatCOUT_test
|
|
*/
|
|
|
|
|
|
#include "lib/test/run.hpp"
|
|
|
|
#include "lib/p.hpp"
|
|
#include "lib/diff/gen-node.hpp"
|
|
|
|
#include "lib/meta/util.hpp"
|
|
#include "lib/meta/trait.hpp"
|
|
#include "lib/format-cout.hpp"
|
|
|
|
#include <string>
|
|
|
|
using lib::P;
|
|
using lib::makeP;
|
|
using lib::diff::GenNode;
|
|
|
|
using std::string;
|
|
|
|
|
|
namespace util {
|
|
namespace test {
|
|
|
|
namespace { // test fixture
|
|
|
|
/** opaque class without string conversion */
|
|
class Reticent
|
|
{
|
|
uint neigh_ = 42;
|
|
};
|
|
|
|
|
|
using lib::meta::is_basically;
|
|
using lib::meta::is_StringLike;
|
|
using lib::meta::can_lexical2string;
|
|
using lib::meta::can_convertToString;
|
|
using lib::meta::use_StringConversion4Stream;
|
|
|
|
template<typename T>
|
|
using BasicallyString = is_basically<T, string>;
|
|
template<typename T>
|
|
using BasicallyCString = std::is_convertible<T, const char*>;
|
|
|
|
|
|
#define SHOW_CHECK(_EXPR_) cout << STRINGIFY(_EXPR_) << "\t : " << (_EXPR_::value? "Yes":"No") << endl;
|
|
#define ANALYSE(_TYPE_) \
|
|
cout << "Type: " STRINGIFY(_TYPE_) " ......"<<endl; \
|
|
SHOW_CHECK (is_StringLike<_TYPE_>); \
|
|
SHOW_CHECK (BasicallyString<_TYPE_>); \
|
|
SHOW_CHECK (BasicallyCString<_TYPE_>); \
|
|
SHOW_CHECK (std::is_arithmetic<_TYPE_>); \
|
|
SHOW_CHECK (can_lexical2string<_TYPE_>); \
|
|
SHOW_CHECK (can_convertToString<_TYPE_>); \
|
|
SHOW_CHECK (use_StringConversion4Stream<_TYPE_>);
|
|
|
|
|
|
void
|
|
showTraits()
|
|
{
|
|
using CharLit = typeof("literal");
|
|
using CharPtr = typeof(const char*);
|
|
using StrCRef = typeof(string const&);
|
|
using GenNodePtr = typeof(GenNode*);
|
|
using GenNodeRef = typeof(GenNode&);
|
|
|
|
ANALYSE (double);
|
|
ANALYSE (string);
|
|
ANALYSE (StrCRef);
|
|
ANALYSE (CharLit);
|
|
ANALYSE (CharPtr)
|
|
ANALYSE (Reticent)
|
|
ANALYSE (P<Reticent>)
|
|
ANALYSE (GenNode)
|
|
ANALYSE (GenNodePtr)
|
|
ANALYSE (GenNodeRef)
|
|
ANALYSE (P<GenNode>)
|
|
cout << endl;
|
|
}
|
|
}//(end)fixture
|
|
|
|
|
|
|
|
|
|
/***************************************************************************//**
|
|
* @test How to build generic string conversion into `ostream::operator<< `.
|
|
* This task (#985) was actually a conglomerate of several chores:
|
|
* - sanitise and segregate the type-traits usage
|
|
* - disentangle the existing util::str conversion helper
|
|
* - extract a basic form from this helper, which can be placed
|
|
* into a header with minimal dependencies. After some consideration,
|
|
* I decided to allow `<typeinfo>` in this category, which allows us
|
|
* at least to show a type name as fallback
|
|
* - distill an essential version of `enable_if`, which can be inlined.
|
|
* This allowed us to get rid of `boost::enable_if` finally.
|
|
* - build a sensible `operator string()` for our `lib::P` based on this
|
|
* - and _finally_, to come up with a templated version of the `ostream`
|
|
* inserter `operator<<`, which does not cause too much havoc when
|
|
* used by default. The greatest challenge here is to avoid ambiguous
|
|
* overloads, yet also to deal with references, `void` and arrays.
|
|
*
|
|
* @see format-cout.hpp
|
|
* @see FormatHelper_test
|
|
*/
|
|
class FormatCOUT_test
|
|
: public Test
|
|
{
|
|
void
|
|
run (Arg)
|
|
{
|
|
showTraits();
|
|
|
|
auto silent = makeP<Reticent>();
|
|
auto chatty = makeP<GenNode>("Hui", "Buh");
|
|
|
|
cout << "smart-ptr, no string conv..." << silent <<endl;
|
|
cout << "smart-ptr, custom conv......" << chatty <<endl;
|
|
|
|
cout << "reference, no string conv..." << *silent <<endl;
|
|
cout << "reference, custom conv......" << *chatty <<endl;
|
|
cout << "pointer, custom conv......" << chatty.get() <<endl;
|
|
|
|
chatty.reset();
|
|
cout << "smart-ptr, NULL pointee....." << chatty <<endl;
|
|
cout << "pointer, NULL pointee....." << chatty.get() <<endl;
|
|
}
|
|
};
|
|
|
|
LAUNCHER (FormatCOUT_test, "unit common");
|
|
|
|
|
|
}} // namespace util::test
|
|
|