deepSeq

lib.deepSeq

Primop

Docs pulled from | This Revision | 18 minutes ago

Nix manual

Takes 2 arguments

e1, e2

This is like seq e1 e2, except that e1 is evaluated deeply: if it’s a list or set, its elements or attributes are also evaluated recursively.

Noogle detected

Aliases

builtins.deepSeq
lib.trivial.deepSeq

Detected Type

deepSeq :: a -> b -> b

Implementation

This function is implemented in c++ and is part of the native nix runtime.

src/libexpr/primops.cc:1268

static void prim_deepSeq(EvalState & state, const PosIdx pos, Value ** args, Value & v)
{
    state.forceValueDeep(*args[0]);
    state.forceValue(*args[1], pos);
    v = *args[1];
}