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WIP: draft command binding by lambda...

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as it stands, this does not work, since lambdas are passed by-value,
while function references can only be passed by explicit reference,
otherwise they'll degrade to a function pointer. And std::function
requires a plain function signature as type argument, not the type
of a function pointer (which doesn't mean you can't construct a
std::function from a FP, indeed there is an explicit overload for
that).
This commit is contained in:
Fischlurch 2017-03-18 19:02:41 +01:00
parent e9948084fc
commit afadc35eab
1 changed files with 22 additions and 4 deletions
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26
tests/core/proc/control/command-setup-test.cpp
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@ -28,6 +28,7 @@
#include "lib/test/run.hpp"
#include "proc/cmd.hpp"
#include "proc/control/command-def.hpp"
#include "lib/format-string.hpp"
#include "lib/format-cout.hpp"
//#include "lib/time/timevalue.hpp"
//#include "lib/p.hpp"
@ -52,6 +53,7 @@ namespace test {
using std::string;
using std::regex;
using std::regex_replace;
using util::_Fmt;
@ -136,6 +138,9 @@ namespace test {
CHECK (def_empty == CommandSetup("to be or not to be"));
CHECK (def_empty != CommandSetup("to pee or not to pee"));
//////////// does not compile -- copy assignment prohibited...
// def_empty = def_1;
// add actual definition closures...
CommandSetup def_0{"test.CommandSetup.def_0"};
@ -153,11 +158,24 @@ namespace test {
.undoOperation (undoIt);
};
CommandSetup def_2{"test.CommandSetup.def_2"};
//////////// does not compile -- copy assignment prohibited...
// def_empty = def_1;
CommandSetup def_2 = CommandSetup{"test.CommandSetup.def_2"}
= [&](CommandDef def) // NOTE: we capture context by reference
{
def.operation ([&](uint cnt)
{
testString += pattern % cnt; // NOTE: capture the field 'pattern' of the enclosing class
})
.captureUndo ([](uint) -> string
{
return testString;
})
.undoOperation ([](uint, string oldVal)
{
testString = oldVal;
});
};
}
_Fmt pattern{" %d times."};
/** @test actually issue the definitions captured as side-effect of the preceding test. */