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-rw-r--r--c/common.h14
1 files changed, 9 insertions, 5 deletions
diff --git a/c/common.h b/c/common.h
index 2c0be13..c6c7dbd 100644
--- a/c/common.h
+++ b/c/common.h
@@ -54,7 +54,11 @@ std::optional<T> maybe_make(U... xs)
}
}
-/* Call Windows API function, throwing error on NULL. */
+/* Variable template for caching values from GetSystemMetrics. */
+template <int I>
+const auto Metric = GetSystemMetrics(I);
+
+/* Check result of Windows API call, throwing error on NULL. */
template <typename T>
inline T require(const T x)
{
@@ -62,7 +66,7 @@ inline T require(const T x)
return x;
}
-/* Call Windows API function, showing a warning on NULL. */
+/* Check result of Windows API call, showing a warning on NULL. */
template <typename T>
inline T prefer(const T x)
{
@@ -75,7 +79,7 @@ inline T prefer(const T x)
}
/* Conditionally choose between two values. This template is necessary
- * because the ternary conditional operator chooses only between
+ * because the ternary conditional operator can choose only between
* values of the same type. */
template <bool B, typename X, typename Y>
constexpr std::enable_if_t<B == true, X> choose(X x, Y) { return x; }
@@ -83,10 +87,10 @@ template <bool B, typename X, typename Y>
constexpr std::enable_if_t<B == false, Y> choose(X, Y y) { return y; }
/* Conditionally choose between ANSI and wide string literal. */
-#define AWTEXT(t, s) choose<std::is_same_v<t, char>>(s, L"" s)
+#define AWTEXT(t, s) choose<std::is_same_v<t, wchar_t>>(L"" s, s)
/* Conditionally choose between ANSI and wide Windows API function. */
-#define AWFUN(t, f) choose<std::is_same_v<t, char>>(f##A, f##W)
+#define AWFUN(t, f) choose<std::is_same_v<t, wchar_t>>(f##W, f##A)
/* Return integer scaled for current DPI. */
inline int Dpi(const int i)