Ichthyostega
47b57da646
As expected, these work on the new-style variadic type sequences equally well than on the old ones (tail-filled with `Nil` markers). On that occasion, a complete makeover of the huge test case was carried out, now relying on `ExpectString` instead of printing to STDOUT. This has the benefit of showing the expectation immediately next to the code to be tested, and thus makes it much easier to ''actually see'' how these meta-functions operate on their parameters (which in fact are types in a type list)
87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/*
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TUPLE-DIAGNOSTICS - helper for diagnostics of type tuples
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Copyright (C)
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2009, Hermann Vosseler <Ichthyostega@web.de>
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**Lumiera** is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version. See the file COPYING for further details.
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* *****************************************************************/
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/** @file tuple-diagnostics.hpp
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** an extension to typelist-diagnostics.hpp, allowing to dump the \em contents of a Tuple datatype.
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** With the help of our [generic string converter](\ref util::toString), and the BuildTupleAccessor
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** defined within tuple-helper.hpp, we're able to show the type and contents of any data record
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** based on std::tuple. For unit-testing, special formatting is provided for the Num<int>
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** test types, which makes typelist and tuples of these types a good candidate for tests.
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**
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** @see TupleHelper_test
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** @see FunctionClosure_test
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** @see TypelistManip_test
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**
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*/
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#ifndef META_TUPLE_DIAGNOSTICS_H
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#define META_TUPLE_DIAGNOSTICS_H
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#include "meta/typelist-diagnostics.hpp"
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#include "lib/meta/tuple-helper.hpp"
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#include "lib/format-string.hpp"
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#include "lib/format-obj.hpp"
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#include <string>
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using std::string;
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namespace util {
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template<int i>
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struct StringConv<lib::meta::Num<i>>
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{
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static std::string
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invoke (lib::meta::Num<i> num) noexcept
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{
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static util::_Fmt constElm("(%i)");
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static util::_Fmt changedElm("{%i}");
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return string( (num.o_==i? constElm:changedElm) % int(num.o_));
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}
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};
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}
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namespace lib {
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namespace meta {
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namespace test {
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/* ===== printing Tuple types and contents ===== */
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template<typename TUP>
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inline enable_if<is_Tuple<TUP>,
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string >
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showType ()
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{
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using TypeList = typename RebindTupleTypes<TUP>::List;
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using DumpPrinter = InstantiateChained<TypeList, Printer, NullP>;
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return "TUPLE"
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+ DumpPrinter::show();
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}
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// see the macros DISPLAY and DUMPVAL defined in typelist-diagnostics.hpp
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}}} // namespace lib::meta::test
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#endif
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