Logtalk reference manual
Built-in predicate: logtalk_load/2
Contents > Reference Manual > Built-in Predicates > logtalk_load/2

## logtalk_load/2

#### Description

    logtalk_load(File, Flags)
    logtalk_load(Files, Flags)

Compiles to disk and then loads to memory a source file or a list of source files using a list of compiler flags. The Logtalk source file name extension (by default, `.lgt`) can be omitted. Compiler flags are represented as flag(value). This predicate can also be used to compile Prolog source files as Logtalk source code. When no recognized Logtalk or Prolog extension is specified, the compiler tries first to append a Logtalk source file extension and then a Prolog source file extension. If that fails, the compiler tries to use the file name as-is. For a description of the available compiler flags, please consult the User Manual. Source file paths can be absolute, relative to the current directory, or use library notation.

Note that only the errors related to problems in the predicate argument are listed below. This predicate fails when errors are found during compilation of a source file.

#### Template and modes

    logtalk_load(@source_file_name, @list(compiler_flag))
    logtalk_load(@list(source_file_name), @list(compiler_flag))

#### Errors

File is a variable:
  `instantiation_error`
Files is a variable or a list with an element which is a variable:
  `instantiation_error`
File, or an element File of the Files list, is neither a variable nor a source file name:
  `type_error(source_file_name, File)`
File, or an element File of the Files list, uses library notation but the library does not exist:
  `existence_error(library, Library)`
File or an element File of the Files list, does not exist:
  `existence_error(file, File)`
Flags is a variable or a list with an element which is a variable:
  `instantiation_error`
Flags is neither a variable nor a proper list:
  `type_error(list, Flags)`
An element Flag of the Flags list is not a valid compiler flag:
  `type_error(compiler_flag, Flag)`
An element Flag of the Flags list defines a value for a read-only compiler flag:
  `permission_error(modify, flag, Flag)`
An element Flag of the Flags list defines an invalid value for a flag:
  `domain_error(flag_value, Flag+Value)`

#### Examples

    | ?- logtalk_load(list, []).

    | ?- logtalk_load(types(tree)).

    | ?- logtalk_load([listp, list], [source_data(off), portability(silent)]).

#### See also

`logtalk_compile/1`, `logtalk_compile/2`, `logtalk_load/1`, `logtalk_make/0`, `logtalk_make/1`
`logtalk_library_path/2`