Class: FFI::VariadicInvoker

Inherits:
Object
  • Object
show all
Defined in:
lib/ffi/variadic.rb

Instance Method Summary collapse

Instance Method Details

#attach(mod, mname) ⇒ Object

Attach the invoker to module mod as mname



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# File 'lib/ffi/variadic.rb', line 53

def attach(mod, mname)
  invoker = self
  params = "*args"
  call = "call"
  mname = mname.to_sym
  mod.module_eval <<-code, __FILE__, __LINE__
    @ffi_functions = {} unless defined?(@ffi_functions)
    @ffi_functions[#{mname.inspect}] = invoker

    def self.#{mname}(#{params})
      @ffi_functions[#{mname.inspect}].#{call}(#{params})
    end

    define_method(#{mname.inspect}, &method(#{mname.inspect}))
  code
  invoker
end

#call(*args, &block) ⇒ Object 



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# File 'lib/ffi/variadic.rb', line 35

def call(*args, &block)
  param_types = Array.new(@fixed)
  param_values = Array.new
  @fixed.each_with_index do |t, i|
    param_values << args[i]
  end
  i = @fixed.length
  while i < args.length
    param_types << FFI.find_type(args[i], @type_map)
    param_values << args[i + 1]
    i += 2
  end
  invoke(param_types, param_values, &block)
end

#param_types ⇒ Array<FFI::Type>

Retrieve Array of parameter types

This method returns an Array of FFI types accepted as function parameters.

Returns:

  • (Array<FFI::Type>) 


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# File 'lib/ffi/variadic.rb', line 76

def param_types
  [*@fixed, Type::Builtin::VARARGS]
end