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std::basic_string is nice, but it is not very ergonomic if everything
you really need is to automatically free C strings at end of scope.
I suppose I could have used std::unique_ptr for this, but I suspect
the ergonomics would be worse.
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I find it much simpler. It is very safe, as wszf only accepts
fixed-size arrays. There is, of course, the chance that swprintf_s
fails and writes nothing into the array. This can be handled by the
caller, if desired.
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Even though it is a fun challange in many ways, I think that,
realistically, it is probably not worth the complexity. The
Prolog backend isn't ANSI-compatible either.
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This reverts much of 97f0a27.
1. It turns out not to be a good idea to resize the list view columns
based on the list view window's own rectangle, as it will change
depending on whether a scrollbar is visible. The problem is that
resizing the columns may add a horizontal scrollbar -- which in
turn may add a vertical scrollbar.
2. The WS_EX_CLIENTEDGE style does not look very good in "modern"
(non-classic) themes. In 97f0a27, I tried solving this by extending
the dimensions of the child windows such that their edges were
hidden. However, this type of overlapping causes problems with the
status bar. My new solution is to instead *reduce* the child
windows' dimensions. This achieves a visual impression similar to
the thicker (more well-designed) edges of the "classically themed"
list view control. To make it look even better, the main window
background is changed from COLOR_WINDOWFRAME (white) to
COLOR_WINDOW (light gray).
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Turns out that SWI-Prolog's wide string functions, which I started
using in 03fe361, do not convert between narrow Prolog atoms and wide
C strings, as I mistakenly thought. Instead, they work with wide
Prolog atoms. In hindsight, it is not surprising.
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This incidentally removes the need for the variable
template introduced by 21e96c6. I'm sure it will be
needed at some point, though.
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The variable template could be generalized like this:
template <auto F, auto... A> const auto cache = F(A...);
and instantiated like:
cache<GetSystemMetrics, SM_CXVSCROLL>
It would still be limited to constant function arguments, which
usually isn't a problem for GetSystemMetrics, but might be for
other functions.
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Not quite so awful anymore.
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No, not "awful", AWFUN!
Speaking of AWFUN, here is an alternative implementation of it:
#define AWFUN(t, f) cond_fun<t, f##A, f##W>
template <typename T, auto F, auto G>
std::enable_if_t<std::is_same_v<T, char>, decltype(F)> cond_fun = F;
template <auto F, auto G>
auto cond_fun<wchar_t, F, G> = G;
This implementation uses a variable template instead of a function
template, but I decided against it, as (at least I think) it would
instantiate useless variables that merely point to pre-existing API
functions. Like,
auto cond_fun__wchar_t__blablabla = MessageBoxW;
auto cond_fun__char__blablabla = MessageBoxA;
which is quite useless. Better to just have a constexpr function,
which the compiler may inline, return the real function pointer.
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In warn_nil, the return value was undefined on exception -- I think.
While informative, the names throw_nil and warn_nil don't work very
well in conditionals:
if (warn_nil<f>(...)) g();
sounds like g should be called if f returns nil and a warning is
issued. But it is actually the other way around; g is called if f is
successful.
if (prefer<f>(...)) g();
sounds less like that.
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This is equivalent, but it may be useful to highlight that `args' does
not HAVE to be declared in order to get the return type of the
function call.
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Some of the checks are likely redundant, but the Windows API
documentation rarely makes it clear WHICH errors may be returned (and
under which circumstances) rather than simply WHETHER errors may be
returned (under any circumstances, including those that do not apply
in the given case).
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It isn't really more safe, but it removes the need for a confusing
function pointer cast, which is easy to get wrong. As far as the
compiler is concerned, the result is literally the same, but it does
force the caller to (indirectly, via the template parameter) cast the
return value, which may be a good thing.
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f(void) is a C-ism that is valid but unnecessary in C++.
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This is obviously a lot less obtuse.
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It seems that "right-spaced" pointers are more widely used among C++
programmers.
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Note that I did NOT add const to non-pointer/non-reference arguments
in function declarations (without a following definition), as they do
not mean anything there.
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If needed in the future, it is possible to simply copy it from the Git
history.
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I.e. using std::basic_string<TCHAR> instead of TCHAR *. This removes
all unmanaged frees.
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This is feasible now that the makedeps script exists to automatically
manage build dependencies (see 6034fe2, d00f8b3).
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Some older UNIX programs are organized like this,
and I think it gives a very good overview over the code.
See troff for an example.
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