name: duk_require_c_function

proto: |
  duk_c_function duk_require_c_function(duk_context *ctx, duk_idx_t idx);

stack: |
  [ ... val! ... ]

summary: |
  <p>Like <code><a href="#duk_get_c_function">duk_get_c_function()</a></code>, but
  throws an error if the value at <code>idx</code> is not an Ecmascript function
  associated with a Duktape/C function or if the index is invalid.</p>

example: |
  duk_c_function funcptr;

  funcptr = duk_require_c_function(ctx, -3);

tags:
  - stack
  - function

introduced: 1.0.0