typeOf

builtins.typeOf

Primop

Docs pulled from | This Revision | about 4 hours ago

Nix manual

Takes 1 arguments

Return a string representing the type of the value e, namely "int", "bool", "string", "path", "null", "set", "list", "lambda" or "float".

Noogle detected

Aliases

Detected Type

typeOf :: a -> String

Implementation

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

src/libexpr/primops.cc:533

static void prim_typeOf(EvalState & state, const PosIdx pos, Value ** args, Value & v)
{
    state.forceValue(*args[0], pos);
    switch (args[0]->type()) {
    case nInt:
        v.mkStringNoCopy("int"_sds);
        break;
    case nBool:
        v.mkStringNoCopy("bool"_sds);
        break;
    case nString:
        v.mkStringNoCopy("string"_sds);
        break;
    case nPath:
        v.mkStringNoCopy("path"_sds);
        break;
    case nNull:
        v.mkStringNoCopy("null"_sds);
        break;
    case nAttrs:
        v.mkStringNoCopy("set"_sds);
        break;
    case nList:
        v.mkStringNoCopy("list"_sds);
        break;
    case nFunction:
        v.mkStringNoCopy("lambda"_sds);
        break;
    case nExternal:
        v.mkString(args[0]->external()->typeOf(), state.mem);
        break;
    case nFloat:
        v.mkStringNoCopy("float"_sds);
        break;
    case nThunk:
    case nFailed:
        unreachable();
    }
}