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C API: Add nix_value_call_multi, NIX_VALUE_CALL

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_multi can be implemented more efficiently.
NIX_VALUE_CALL is a convenient way to invoke it.
This commit is contained in:
Robert Hensing 2024-05-23 19:55:32 +02:00
parent ab106c5ca3
commit 2497d10351
3 changed files with 100 additions and 1 deletions
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41
src/libexpr-c/nix_api_expr.h
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@ -12,6 +12,7 @@
#include "nix_api_store.h"
#include "nix_api_util.h"
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
@ -80,6 +81,46 @@ nix_err nix_expr_eval_from_string(
*/
nix_err nix_value_call(nix_c_context * context, EvalState * state, Value * fn, Value * arg, Value * value);
/**
* @brief Calls a Nix function with multiple arguments.
*
* Technically these are functions that return functions. It is common for Nix
* functions to be curried, so this function is useful for calling them.
*
* @param[out] context Optional, stores error information
* @param[in] state The state of the evaluation.
* @param[in] fn The Nix function to call.
* @param[in] nargs The number of arguments.
* @param[in] args The arguments to pass to the function.
* @param[out] value The result of the function call.
*
* @see nix_value_call For the single argument primitive.
* @see NIX_VALUE_CALL For a macro that wraps this function for convenience.
*/
nix_err nix_value_call_multi(
nix_c_context * context, EvalState * state, Value * fn, size_t nargs, Value ** args, Value * value);
/**
* @brief Calls a Nix function with multiple arguments.
*
* Technically these are functions that return functions. It is common for Nix
* functions to be curried, so this function is useful for calling them.
*
* @param[out] context Optional, stores error information
* @param[in] state The state of the evaluation.
* @param[out] value The result of the function call.
* @param[in] fn The Nix function to call.
* @param[in] args The arguments to pass to the function.
*
* @see nix_value_call_multi
*/
#define NIX_VALUE_CALL(context, state, value, fn, ...) \
do { \
Value * args_array[] = {__VA_ARGS__}; \
size_t nargs = sizeof(args_array) / sizeof(args_array[0]); \
nix_value_call_multi(context, state, fn, nargs, args_array, value); \
} while (0)
/**
* @brief Forces the evaluation of a Nix value.
*