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September 8, 2018 13:07
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Simple circular buffer in Odin
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Circular_Buffer :: struct(T: type, N: int) { | |
data: [N]T, | |
cursor: int, | |
length: int, | |
} | |
push_back :: inline proc(using cb: ^$T/Circular_Buffer, v: T.T) -> bool #no_bounds_check { | |
data[(cursor + length) %% T.N] = v; | |
if length < T.N { | |
length += 1; | |
return true; | |
} else { | |
cursor += 1; | |
return false; | |
} | |
} | |
push_front :: inline proc(using cb: ^$T/Circular_Buffer, v: T.T) -> bool #no_bounds_check { | |
data[(cursor - 1) %% T.N] = v; | |
cursor -= 1; | |
if length < T.N { | |
length += 1; | |
return true; | |
} else { | |
return false; | |
} | |
} | |
pop_back :: inline proc(using cb: ^$T/Circular_Buffer) -> (T.T, bool) #no_bounds_check { | |
if length == 0 do return T.T{}, false; | |
v := data[(cursor + length - 1) %% T.N]; | |
length -= 1; | |
return v, true; | |
} | |
pop_front :: inline proc(using cb: ^$T/Circular_Buffer) -> (T.T, bool) #no_bounds_check { | |
if length == 0 do return T.T{}, false; | |
v := data[cursor %% T.N]; | |
length -= 1; | |
cursor += 1; | |
return v, true; | |
} | |
peek_front :: inline proc(using cb: ^$T/Circular_Buffer) -> (T.T, bool) #no_bounds_check { | |
if length == 0 do return T.T{}, false; | |
return data[cursor %% T.N], true; | |
} | |
peek_back :: inline proc(using cb: ^$T/Circular_Buffer) -> (T.T, bool) #no_bounds_check { | |
if length == 0 do return T.T{}, false; | |
return data[(cursor + length - 1) %% T.N], true; | |
} | |
peek :: inline proc(using cb: ^$T/Circular_Buffer, i: int) -> (T.T, bool) #no_bounds_check { | |
if length == 0 do return T.T{}, false; | |
return data[(cursor + i) %% T.N], true; | |
} | |
slice_first :: inline proc(using cb: ^$T/Circular_Buffer) -> []T.T #no_bounds_check { | |
return data[cursor%%T.N:min((cursor %% T.N) + length, T.N)]; | |
} | |
slice_second :: inline proc(using cb: ^$T/Circular_Buffer) -> []T.T #no_bounds_check { | |
return data[:clamp((cursor %% T.N) + length - T.N, 0, cursor%%T.N)]; | |
} | |
linearize :: inline proc(using cb: ^$T/Circular_Buffer) #no_bounds_check { | |
for i in 0..length-(cursor %% T.N)-1 { | |
data[i], data[(cursor + i) %% T.N] = data[(cursor + i) %% T.N], data[i]; | |
} | |
cursor = 0; | |
} |
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