forked from lix-project/lix
86b05ccd54
This allows writing fallback code like
if builtins ? fetchClosure then
builtins.fetchClose { ... }
else
builtins.storePath ...
47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#pragma once
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#include "eval.hh"
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#include <tuple>
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#include <vector>
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namespace nix {
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struct RegisterPrimOp
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{
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struct Info
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{
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std::string name;
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std::vector<std::string> args;
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size_t arity = 0;
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const char * doc;
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PrimOpFun fun;
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std::optional<ExperimentalFeature> experimentalFeature;
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};
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typedef std::vector<Info> PrimOps;
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static PrimOps * primOps;
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/* You can register a constant by passing an arity of 0. fun
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will get called during EvalState initialization, so there
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may be primops not yet added and builtins is not yet sorted. */
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RegisterPrimOp(
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std::string name,
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size_t arity,
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PrimOpFun fun);
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RegisterPrimOp(Info && info);
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};
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/* These primops are disabled without enableNativeCode, but plugins
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may wish to use them in limited contexts without globally enabling
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them. */
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/* Load a ValueInitializer from a DSO and return whatever it initializes */
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void prim_importNative(EvalState & state, const Pos & pos, Value * * args, Value & v);
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/* Execute a program and parse its output */
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void prim_exec(EvalState & state, const Pos & pos, Value * * args, Value & v);
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}
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