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-rw-r--r--nexgb/xgbgen/size.go9
1 files changed, 9 insertions, 0 deletions
diff --git a/nexgb/xgbgen/size.go b/nexgb/xgbgen/size.go
index 70edb8f..d8d3ac3 100644
--- a/nexgb/xgbgen/size.go
+++ b/nexgb/xgbgen/size.go
@@ -1,21 +1,30 @@
package main
+// Size corresponds to an expression that represents the number of bytes
+// in some *thing*. Generally, sizes are used to allocate buffers and to
+// inform X how big requests are.
+// Size is basically a thin layer over an Expression that yields easy methods
+// for adding and multiplying sizes.
type Size struct {
Expression
}
+// newFixedSize creates a new Size with some fixed and known value.
func newFixedSize(fixed uint) Size {
return Size{&Value{v: fixed}}
}
+// newExpressionSize creates a new Size with some expression.
func newExpressionSize(variable Expression) Size {
return Size{variable}
}
+// Add adds s1 and s2 and returns a new Size.
func (s1 Size) Add(s2 Size) Size {
return Size{newBinaryOp("+", s1, s2)}
}
+// Multiply mupltiplies s1 and s2 and returns a new Size.
func (s1 Size) Multiply(s2 Size) Size {
return Size{newBinaryOp("*", s1, s2)}
}