debian-packages/taggedalgebraic
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Detect types that are obviously not function literals.

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This avoids extremely cryptic error messages with no pointer to the origin of the problem.
This commit is contained in:
Sönke Ludwig 2019-02-24 14:24:37 +01:00
parent c1e3e5a6a2
commit 141a4e290a
1 changed files with 5 additions and 1 deletions
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6
source/taggedalgebraic/taggedunion.d
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@ -546,11 +546,15 @@ enum isUnitType(T) = is(T == Void) || is(T == void) || is(T == typeof(null));
private template validateHandlers(TU, VISITORS...)
{
import std.traits : isSomeFunction;
alias Types = TU.FieldTypes;
static foreach (int i; 0 .. VISITORS.length) {
static assert(!is(VISITORS[i]) || isSomeFunction!(VISITORS[i]),
"Visitor at index "~i.stringof~" must be a function/delegate literal: "~VISITORS[i].stringof);
static assert(anySatisfy!(matchesType!(VISITORS[i]), Types),
"Visitor at index "~i.stringof~" does not match any type of "~TU.stringof);
"Visitor at index "~i.stringof~" does not match any type of "~TU.FieldTypes.stringof);
}
}