Add Wait block as a sub-type of BaseBuildingBlock

src/all_building_blocks/all_building_blocks.jl

@@ -3,10 +3,12 @@ include("base_building_blocks.jl")
 include("building_blocks.jl")
 include("trapezoids.jl")
 include("spoilt_slice_selects.jl")
+include("wait_blocks.jl")
 
 import .BaseBuildingBlocks: waveform, waveform_sequence, events, BaseBuildingBlock
 import .BuildingBlocks: BuildingBlock
 import .Trapezoids: Trapezoid, SliceSelect, LineReadout
 import .SpoiltSliceSelects: SpoiltSliceSelect
+import ..WaitBlocks: Wait
 
 end
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src/all_building_blocks/wait_blocks.jl

+module WaitBlocks
+import JuMP: @constraint
+import ...BuildSequences: get_global_model
+import ...Variables: get_free_variable, VariableType, duration
+import ...Components: NoGradient
+import ..BaseBuildingBlocks: BaseBuildingBlock
+
+struct Wait <: BuildingBlock
+    duration :: VariableType
+    function Wait(var)
+        res = new(get_free_variable(var))
+        if !(res.duration isa Number)
+            @constraint get_global_model() res.duration >= 0
+        end
+    end
+end
+
+duration(wb::Wait) = wb.duration
+Base.keys(::Wait) = (:empty)
+Base.getindex(wb::Wait) = NoGradient{1}(wb.duration)
+
+end
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