Ichthyostega
806db414dd
* Lumiera source code always was copyrighted by individual contributors * there is no entity "Lumiera.org" which holds any copyrights * Lumiera source code is provided under the GPL Version 2+ == Explanations == Lumiera as a whole is distributed under Copyleft, GNU General Public License Version 2 or above. For this to become legally effective, the ''File COPYING in the root directory is sufficient.'' The licensing header in each file is not strictly necessary, yet considered good practice; attaching a licence notice increases the likeliness that this information is retained in case someone extracts individual code files. However, it is not by the presence of some text, that legally binding licensing terms become effective; rather the fact matters that a given piece of code was provably copyrighted and published under a license. Even reformatting the code, renaming some variables or deleting parts of the code will not alter this legal situation, but rather creates a derivative work, which is likewise covered by the GPL! The most relevant information in the file header is the notice regarding the time of the first individual copyright claim. By virtue of this initial copyright, the first author is entitled to choose the terms of licensing. All further modifications are permitted and covered by the License. The specific wording or format of the copyright header is not legally relevant, as long as the intention to publish under the GPL remains clear. The extended wording was based on a recommendation by the FSF. It can be shortened, because the full terms of the license are provided alongside the distribution, in the file COPYING.
133 lines
4.2 KiB
C++
133 lines
4.2 KiB
C++
/*
|
||
BuilderQualifierSupport(Test) - demonstrate accepting arbitrary qualifier terms on a builder function
|
||
|
||
Copyright (C)
|
||
2022, Hermann Vosseler <Ichthyostega@web.de>
|
||
|
||
**Lumiera** 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. See the file COPYING for further details.
|
||
|
||
* *****************************************************************/
|
||
|
||
/** @file builder-qualifier-support-test.cpp
|
||
** unit test \ref lib::test::BuilderQualifierSupport_test
|
||
*/
|
||
|
||
|
||
|
||
|
||
#include "lib/test/run.hpp"
|
||
#include "lib/builder-qualifier-support.hpp"
|
||
#include "lib/test/test-helper.hpp"
|
||
|
||
#include <string>
|
||
|
||
|
||
namespace lib {
|
||
namespace test{
|
||
|
||
using std::string;
|
||
|
||
|
||
namespace { // example strategy to use the builder-qualifier-support...
|
||
|
||
|
||
/** Example "strategy" class, which can be configured
|
||
* with additional qualifiers at construction */
|
||
class ExampleStrategy
|
||
: BuilderQualifierSupport<ExampleStrategy>
|
||
{
|
||
|
||
friend Qualifier one();
|
||
friend Qualifier two(string);
|
||
|
||
public:
|
||
ExampleStrategy() = default;
|
||
|
||
template<class... QS>
|
||
ExampleStrategy(Qualifier qual, QS... qs)
|
||
: ExampleStrategy{}
|
||
{
|
||
qualify(*this, qual, qs...);
|
||
}
|
||
|
||
operator string () const
|
||
{
|
||
return "Strategy{"+prop_+"}";
|
||
}
|
||
|
||
private:
|
||
/** a private property
|
||
* to be manipulated by the qualifiers */
|
||
string prop_{"∅"};
|
||
};
|
||
|
||
|
||
/** definition of a qualifier `one()` */
|
||
ExampleStrategy::Qualifier
|
||
one()
|
||
{
|
||
return ExampleStrategy::Qualifier{[](ExampleStrategy& strategy)
|
||
{
|
||
strategy.prop_ = "!one!";
|
||
}};
|
||
}
|
||
|
||
/** definition of another qualifier `two(arg)`, accepting an additional argument */
|
||
ExampleStrategy::Qualifier
|
||
two(string additionalArg)
|
||
{
|
||
return ExampleStrategy::Qualifier{[=](ExampleStrategy& strategy)
|
||
{
|
||
strategy.prop_ += ".two("+additionalArg+")";
|
||
}};
|
||
}
|
||
|
||
}//(End)Test example
|
||
|
||
|
||
|
||
/***********************************************************************************//**
|
||
* @test Demonstrate a technique to supply additional descriptive ctor arguments in a type safe way.
|
||
* - target and receiver may be some configurable Strategy etc.
|
||
* - the idea is to provide friend functors, which might tweak or reset internal settings;
|
||
* - these functors are packaged into free standing friend functions with intuitive naming...
|
||
* - which, on call-site, look like algebraic expressions/data-types.
|
||
* @remark because the actual helper function is a free function, it may be integrated
|
||
* in various ways, but typically the support template will be mixed-in, as demonstrated
|
||
* here; this mechanism can be integrated into a constructor call, thus optionally allowing
|
||
* for arbitrary extra qualifiers, even with extra arguments.
|
||
*
|
||
* @see builder-qualifier-support.hpp
|
||
*/
|
||
class BuilderQualifierSupport_test : public Test
|
||
{
|
||
|
||
void
|
||
run (Arg)
|
||
{
|
||
ExampleStrategy f0;
|
||
CHECK (f0 == "Strategy{∅}"_expect);
|
||
|
||
ExampleStrategy f1(one());
|
||
CHECK (f1 == "Strategy{!one!}"_expect);
|
||
|
||
ExampleStrategy f2(two("Ψ"));
|
||
CHECK (f2 == "Strategy{∅.two(Ψ)}"_expect);
|
||
|
||
ExampleStrategy f3(one(), two("↯"));
|
||
CHECK (f3 == "Strategy{!one!.two(↯)}"_expect);
|
||
|
||
ExampleStrategy f4(two("☭"), one());
|
||
CHECK (f4 == "Strategy{!one!}"_expect); // Note: evaluated from left to right, one() overwrites prop_
|
||
}
|
||
};
|
||
|
||
|
||
/** Register this test class... */
|
||
LAUNCHER (BuilderQualifierSupport_test, "unit common");
|
||
|
||
|
||
}} // namespace lib::test
|