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Improved error message when calling sum without a default value

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If sum() is called, it tries to find a default value by constructing it with 0 (e.g. float(0)). This works for numbers, but produces obscure errors if the value cannot be constructed this way (e.g. issue #19525). The error message now states that the problem lies in the default value and suggests to supply one instead.
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Marco de Wild 2019-12-30 14:12:18 +01:00
parent e3c912f7e6
commit d93e7be91d
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std/algorithm/iteration.d
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@ -6398,6 +6398,9 @@ if (isInputRange!R && !isInfinite!R && is(typeof(r.front + r.front)))
alias Seed = typeof(E.init + 0.0); //biggest of double/real
else
alias Seed = typeof(r.front + r.front);
static assert(is(typeof(Unqual!Seed(0))),
"Could not initiate an initial value for " ~ (Unqual!Seed).stringof
~ ". Please supply an initial value manually.");
return sum(r, Unqual!Seed(0));
}
/// ditto