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Struct ¶

G-Golf class, accessors, methods and procedures to deal with C struct types.

Classes ¶

<gi-struct>

Procedures, Accessors and Methods ¶

!g-type____

!g-name_

!name____

!alignment

!size

!is-gtype-struct?

!is-foreign?

!field-types

!field-desc

!scm-types

!init-vals

!is-opaque?

!is-semi-opaque?

field-offset

Description ¶

G-Golf class, accessors, methods and procedures to deal with C struct types.

Classes ¶

Class: <gi-struct> ¶

<gi-struct> is a class. It’s an instance of <class>.

Superclasses are:

<object>

Class Precedence List is:

<g-struct>

<object>

<top>

Directs slots are:

g-type

g-name

name

alignment

size

is-gtype-struct?

is-foreign?

field-types

field-desc

scm-types

init-vals

is-opaque?

is-semi-opaque?

Instances of the <gi-struct> are immutable (to be precise, there are not meant to be mutated, see GOOPS Notes and Conventions, ’Slots are not Immutable’).

Procedures and Accessors ¶

Accessor: !g-type (inst <gi-struct>) ¶

Accessor: !g-name (inst <gi-struct>) ¶

Accessor: !name (inst <gi-struct>) ¶

Accessor: !alignment (inst <gi-struct>) ¶

Accessor: !size (inst <gi-struct>) ¶

Accessor: !is-gtype-struct? (inst <gi-struct>) ¶

Accessor: !field-types (inst <gi-struct>) ¶

Accessor: !field-desc (inst <gi-struct>) ¶

Accessor: !scm-types (inst <gi-struct>) ¶

Accessor: !init-vals (inst <gi-struct>) ¶

Returns the content of their respective slot for inst.

Accessor: !is-opaque? (inst <gi-struct>) ¶

Returns #t if inst is ‘opaque’, otherwise, it returns #f.

A <gi-struct> instance is said to be ‘opaque’ when the call to g-struct-info-get-size upon its GIStructInfo pointer returns zero. In scheme, these <gi-struct> instances have no fields.

‘Opaque’ boxed types should never be ‘decoded’, nor ‘encoded’. Instead, procedures, accessors and methods should ‘blindingly’ receive, pass and/or return their pointer(s).

Accessor: !is-semi-opaque? (inst <gi-struct>) ¶

Returns #t if inst is ‘semi-opaque’, otherwise, it returns #f.

A <gi-struct> instance is said to be ‘semi-opaque’ when one of its field types is void, interface or if the total size of the scm-types differs from the inst size slot vlue.

‘Semi-opaque’ boxed types should never be ‘decoded’, nor ‘encoded’. Instead, procedures, accessors and methods should ‘blindingly’ receive, pass and/or return their pointer(s).

Method: field-offset (inst <gi-struct>) field-name ¶

Returns an integer.

Obtain and returns the field-name offset for inst, It is an error to call this method if there is no such field-name defined for inst.