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https://github.com/nofeaturesonlybugs/set
Package set is a small wrapper around the official reflect package that facilitates loose type conversion and assignment into native Go types.
https://github.com/nofeaturesonlybugs/set
go golang reflection type-coercion type-conversion typeconversion
Last synced: about 1 month ago
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Package set is a small wrapper around the official reflect package that facilitates loose type conversion and assignment into native Go types.
- Host: GitHub
- URL: https://github.com/nofeaturesonlybugs/set
- Owner: nofeaturesonlybugs
- License: mit
- Created: 2020-12-16T22:12:18.000Z (about 4 years ago)
- Default Branch: master
- Last Pushed: 2022-06-12T16:14:35.000Z (over 2 years ago)
- Last Synced: 2024-08-03T19:10:00.929Z (5 months ago)
- Topics: go, golang, reflection, type-coercion, type-conversion, typeconversion
- Language: Go
- Homepage:
- Size: 1.11 MB
- Stars: 46
- Watchers: 5
- Forks: 4
- Open Issues: 0
-
Metadata Files:
- Readme: README-0.4.0-to-0.5.0.md
- Changelog: changelog.txt
- License: LICENSE
Awesome Lists containing this project
- awesome-go-extra - set - 12-16T22:12:18Z|2022-06-12T16:14:35Z| (Utilities / Fail injection)
README
# Changelog `set v0.4.0` to `set v0.5.0`
This document outlines the changes and justifications between the versions listed above. In general `set v0.5.0` addresses performance and optimization bottlenecks in the prior version.
There are a few breaking changes but they are mostly minor.
## Remove Unnecessary Interface & Switch to Value-Types
The `BoundMapping` interface has been redefined as a struct{}.
The `BoundMapping`, `Mapping`, and `Value` types are no longer created and returned as pointers. Where appropriate their methods use pointer receivers but do not perform `nil` checks.
These changes remove unnecessary pointer dereferences and lower the frequency of values escaping to heap.
## Altered Method Signature(s)
```go
func (m *Mapper) Bind(...) BoundMapping // v0.4.0, old
func (m Mapper) Bind(...) (BoundMapping, error) // v0.5.0, new
```
The `Bind` method now returns an error. This allows the caller to check for incorrect usage, such as supplying a read-only value, at the time of calling Bind.
Any error returned from Bind is also set internally in the BoundMapping. BoundMapping methods will return a pre-set error and no longer have to check on every call if the bound value is usable.
## Sentinal Errors
`v0.5.0` no longer depends on my `errors` package and instead uses sentinal errors. Error paths in `set` no longer produce stack traces and run more efficiently. The returned errors still contain contextual information about where and why the error occurred.
## Deprecated Behavior
The prior version allowed a `*set.Value` to be passed to `Mapper.Bind` or `BoundMapping.Rebind`. This is no longer supported.
This behavior was not publicly documented and buried inside an internal test. I doubt it was used.
However in `v0.5.0` both `Mapper.Bind` and `BoundMapping.Rebind` accept a `reflect.Value` to bind or rebind to. Therefore this behavior is still supported by passing the `set.Value.TopValue` field to bind or rebind.
Open an issue or ask me for help in the Go discord channel if this affects you.
# New Types & Subpackages
## `PreparedMapping`
`PreparedMapping` allows access to a bound value's fields similar to the `BoundMapping` type; however a PreparedMapping requires an access plan to be set with its `Plan` method. Once a plan is established the desired field names are no longer required when calling methods on the PreparedMapping.
`PreparedMapping` is more performant than `BoundMapping` when struct fields will be accessed in the same order after every call to `Rebind`.
## `coerce`
`coerce` is a new subpackage that performs type coercion. The type coercion implementation in the previous version is incredibly slow and inefficient compared to the new implementation.
I can not guarantee the new coercion logic is compatible in every way with the old coercion logic. However all of the existing tests still pass and I've added many new tests.
## `path`
`path` is a new subpackage that performs the initial mapping of Go structs. While traversing structs the `path` package builds information to traverse structs via `reflect` or `unsafe`.
This new version of `set` only traverses structs with `reflect`. However a future version may use or allow `unsafe` traversal and this functionality will be provided by `path`.
# Benchmarks
## Type Coercion
`set v0.5.0` includes a new benchmark `BenchmarkScalarTo` to evaluate the type coercion system.
`v0.4.0`
```
BenchmarkScalarTo
BenchmarkScalarTo/bool-8 343676 3512 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/float32-8 306393 3724 ns/op 4 B/op 1 allocs/op
BenchmarkScalarTo/float64-8 299218 3727 ns/op 8 B/op 1 allocs/op
BenchmarkScalarTo/int-8 323304 3780 ns/op 8 B/op 1 allocs/op
BenchmarkScalarTo/int8-8 323512 3758 ns/op 1 B/op 1 allocs/op
BenchmarkScalarTo/int16-8 315246 3720 ns/op 2 B/op 1 allocs/op
BenchmarkScalarTo/int32-8 307384 3689 ns/op 4 B/op 1 allocs/op
BenchmarkScalarTo/int64-8 307186 3741 ns/op 8 B/op 1 allocs/op
BenchmarkScalarTo/uint-8 307382 3808 ns/op 8 B/op 1 allocs/op
BenchmarkScalarTo/uint8-8 315027 3718 ns/op 1 B/op 1 allocs/op
BenchmarkScalarTo/uint16-8 307386 3785 ns/op 2 B/op 1 allocs/op
BenchmarkScalarTo/uint32-8 323005 3730 ns/op 4 B/op 1 allocs/op
BenchmarkScalarTo/uint64-8 315001 3767 ns/op 8 B/op 1 allocs/op
BenchmarkScalarTo/string-8 159622 7247 ns/op 80 B/op 28 allocs/op
```
`v0.5.0`
```
BenchmarkScalarTo
BenchmarkScalarTo/bool-8 2579983 461.9 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/float32-8 2274598 537.4 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/float64-8 2309199 520.8 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/int-8 2292742 516.4 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/int8-8 2142733 550.1 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/int16-8 2208738 542.2 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/int32-8 2229578 538.1 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/int64-8 2236003 549.8 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/uint-8 2369776 506.1 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/uint8-8 2226345 535.8 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/uint16-8 2222169 539.6 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/uint32-8 2252427 532.2 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/uint64-8 2309792 518.5 ns/op 0 B/op 0 allocs/op
BenchmarkScalarTo/string-8 1444926 826.6 ns/op 104 B/op 8 allocs/op
```
Compared with `benchstat`
```
name old time/op new time/op delta
ScalarTo/bool-8 3.60µs ± 3% 0.46µs ± 1% -87.21% (p=0.008 n=5+5)
ScalarTo/float32-8 3.83µs ± 2% 0.53µs ± 2% -86.14% (p=0.008 n=5+5)
ScalarTo/float64-8 3.74µs ± 2% 0.52µs ± 1% -85.97% (p=0.008 n=5+5)
ScalarTo/int-8 3.73µs ± 2% 0.51µs ± 0% -86.31% (p=0.016 n=5+4)
ScalarTo/int8-8 3.75µs ± 1% 0.55µs ± 1% -85.22% (p=0.008 n=5+5)
ScalarTo/int16-8 3.75µs ± 2% 0.55µs ± 1% -85.42% (p=0.008 n=5+5)
ScalarTo/int32-8 3.75µs ± 2% 0.54µs ± 1% -85.51% (p=0.008 n=5+5)
ScalarTo/int64-8 3.77µs ± 2% 0.54µs ± 0% -85.79% (p=0.008 n=5+5)
ScalarTo/uint-8 3.86µs ± 3% 0.52µs ± 1% -86.59% (p=0.008 n=5+5)
ScalarTo/uint8-8 3.91µs ± 3% 0.55µs ± 1% -86.02% (p=0.008 n=5+5)
ScalarTo/uint16-8 3.92µs ± 1% 0.54µs ± 2% -86.13% (p=0.008 n=5+5)
ScalarTo/uint32-8 3.85µs ± 1% 0.54µs ± 1% -85.93% (p=0.008 n=5+5)
ScalarTo/uint64-8 3.86µs ± 1% 0.52µs ± 0% -86.40% (p=0.008 n=5+5)
ScalarTo/string-8 7.31µs ± 2% 0.83µs ± 2% -88.60% (p=0.008 n=5+5)
```
## `BoundMapping`
`set v0.5.0` includes many new benchmarks for `BoundMapping`. This section compares these benchmarks when run with `v0.4.0` and `v0.5.0`.
`v0.4.0`
```
BenchmarkMapper/Bind_no_Rebind-8 871509 1220 ns/op 384 B/op 10 allocs/op
BenchmarkMapper/Bind_Rebind-8 1214550 998.6 ns/op 128 B/op 8 allocs/op
Benchmark_Mapper_BindPrepare/Bind_unknown1-8 30954 38601 ns/op 10772 B/op 110 allocs/op
Benchmark_Mapper_BindPrepare/Bind_unknown2-8 31384 38476 ns/op 10772 B/op 110 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_simple-8 12542539 94.97 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_simple-8 8889804 130.4 ns/op 24 B/op 2 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_simple-8 2791956 424.3 ns/op 496 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_simple-8 2659396 448.4 ns/op 248 B/op 2 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_nested-8 5980756 201.8 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_nested-8 4653588 266.1 ns/op 48 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_nested-8 1389459 859.1 ns/op 992 B/op 8 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_nested-8 878136 1330 ns/op 746 B/op 7 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_ptr_nested-8 5143212 232.7 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_ptr_nested-8 4058233 294.0 ns/op 48 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_ptr_nested-8 1352497 887.2 ns/op 992 B/op 8 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_ptr_nested-8 878187 1366 ns/op 746 B/op 7 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_primitives-8 1931373 624.2 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_primitives-8 1724206 708.6 ns/op 88 B/op 14 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_primitives-8 359887 3177 ns/op 3472 B/op 28 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_primitives-8 2138775 563.9 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_sale-8 1492143 802.8 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_sale-8 1000000 1030 ns/op 184 B/op 15 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_sale-8 341296 3523 ns/op 3720 B/op 30 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_sale-8 558264 2161 ns/op 840 B/op 8 allocs/op
```
`v0.5.0`
```
BenchmarkMapper/Bind_no_Rebind-8 1316692 891.6 ns/op 128 B/op 8 allocs/op
BenchmarkMapper/Bind_Rebind-8 1508492 803.9 ns/op 128 B/op 8 allocs/op
Benchmark_Mapper_BindPrepare/Bind_unknown1-8 2053950 582.2 ns/op 576 B/op 9 allocs/op
Benchmark_Mapper_BindPrepare/Bind_unknown2-8 2040548 593.8 ns/op 576 B/op 9 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_simple-8 14612013 82.91 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_simple-8 12942205 93.27 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_simple-8 4567026 261.0 ns/op 48 B/op 2 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_simple-8 5918787 201.7 ns/op 24 B/op 1 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_nested-8 7317282 165.0 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_nested-8 6391558 179.5 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_nested-8 2250918 537.0 ns/op 96 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_nested-8 2250134 530.9 ns/op 72 B/op 3 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_ptr_nested-8 6621734 176.9 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_ptr_nested-8 5963674 194.0 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_ptr_nested-8 2128747 559.0 ns/op 96 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_ptr_nested-8 2194550 544.2 ns/op 72 B/op 3 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_primitives-8 2193958 551.2 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_primitives-8 2141484 562.8 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_primitives-8 585465 1979 ns/op 336 B/op 14 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_primitives-8 2627559 457.0 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Assignables_sale-8 1664931 690.5 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Fields_sale-8 1566954 784.1 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Field_sale-8 512841 2309 ns/op 360 B/op 15 allocs/op
Benchmark_Mapper_BindPrepare/Bind_Set_sale-8 878206 1347 ns/op 280 B/op 9 allocs/op
```
Compared with `benchstat`
```
name old time/op new time/op delta
Mapper/Bind_no_Rebind-8 1.20µs ± 2% 0.91µs ± 3% -24.29% (p=0.008 n=5+5)
Mapper/Bind_Rebind-8 986ns ± 2% 808ns ± 2% -18.02% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_unknown1-8 38.3µs ± 1% 0.6µs ± 0% -98.47% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_unknown2-8 38.3µs ± 1% 0.6µs ± 0% -98.45% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_simple-8 93.2ns ± 1% 84.2ns ± 2% -9.62% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Fields_simple-8 129ns ± 0% 94ns ± 2% -27.31% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_simple-8 413ns ± 1% 261ns ± 1% -36.74% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_simple-8 448ns ± 1% 203ns ± 1% -54.72% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_nested-8 198ns ± 1% 162ns ± 3% -18.50% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Fields_nested-8 258ns ± 1% 182ns ± 2% -29.61% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_nested-8 836ns ± 0% 526ns ± 0% -37.11% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_nested-8 1.33µs ± 1% 0.53µs ± 0% -60.49% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_ptr_nested-8 234ns ± 3% 173ns ± 3% -25.93% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Fields_ptr_nested-8 296ns ± 2% 192ns ± 3% -35.17% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_ptr_nested-8 870ns ± 1% 550ns ± 1% -36.84% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_ptr_nested-8 1.37µs ± 1% 0.55µs ± 0% -60.06% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_primitives-8 571ns ± 2% 546ns ± 2% -4.47% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Fields_primitives-8 705ns ± 1% 599ns ± 2% -14.99% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_primitives-8 3.07µs ± 0% 2.02µs ± 1% -34.05% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_primitives-8 569ns ± 1% 454ns ± 0% -20.13% (p=0.016 n=5+4)
_Mapper_BindPrepare/Bind_Assignables_sale-8 765ns ± 2% 662ns ± 2% -13.38% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Fields_sale-8 1.08µs ± 1% 0.74µs ± 5% -31.01% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_sale-8 3.51µs ± 1% 2.34µs ± 1% -33.46% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_sale-8 2.09µs ± 0% 1.36µs ± 2% -35.12% (p=0.008 n=5+5)
name old alloc/op new alloc/op delta
Mapper/Bind_no_Rebind-8 384B ± 0% 128B ± 0% -66.67% (p=0.008 n=5+5)
Mapper/Bind_Rebind-8 128B ± 0% 128B ± 0% ~ (all equal)
_Mapper_BindPrepare/Bind_unknown1-8 10.8kB ± 0% 0.6kB ± 0% -94.65% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_unknown2-8 10.8kB ± 0% 0.6kB ± 0% -94.65% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_simple-8 0.00B 0.00B ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_simple-8 24.0B ± 0% 0.0B -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_simple-8 496B ± 0% 48B ± 0% -90.32% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_simple-8 248B ± 0% 24B ± 0% -90.32% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_nested-8 0.00B 0.00B ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_nested-8 48.0B ± 0% 0.0B -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_nested-8 992B ± 0% 96B ± 0% -90.32% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_nested-8 746B ± 0% 72B ± 0% -90.35% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_ptr_nested-8 0.00B 0.00B ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_ptr_nested-8 48.0B ± 0% 0.0B -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_ptr_nested-8 992B ± 0% 96B ± 0% -90.32% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_ptr_nested-8 746B ± 0% 72B ± 0% -90.35% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_primitives-8 0.00B 0.00B ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_primitives-8 88.0B ± 0% 0.0B -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_primitives-8 3.47kB ± 0% 0.34kB ± 0% -90.32% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_primitives-8 0.00B 0.00B ~ (all equal)
_Mapper_BindPrepare/Bind_Assignables_sale-8 0.00B 0.00B ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_sale-8 184B ± 0% 0B -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_sale-8 3.72kB ± 0% 0.36kB ± 0% -90.32% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_sale-8 840B ± 0% 280B ± 0% -66.67% (p=0.008 n=5+5)
name old allocs/op new allocs/op delta
Mapper/Bind_no_Rebind-8 10.0 ± 0% 8.0 ± 0% -20.00% (p=0.008 n=5+5)
Mapper/Bind_Rebind-8 8.00 ± 0% 8.00 ± 0% ~ (all equal)
_Mapper_BindPrepare/Bind_unknown1-8 110 ± 0% 9 ± 0% -91.82% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_unknown2-8 110 ± 0% 9 ± 0% -91.82% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_simple-8 0.00 0.00 ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_simple-8 2.00 ± 0% 0.00 -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_simple-8 4.00 ± 0% 2.00 ± 0% -50.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_simple-8 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_nested-8 0.00 0.00 ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_nested-8 4.00 ± 0% 0.00 -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_nested-8 8.00 ± 0% 4.00 ± 0% -50.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_nested-8 7.00 ± 0% 3.00 ± 0% -57.14% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_ptr_nested-8 0.00 0.00 ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_ptr_nested-8 4.00 ± 0% 0.00 -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_ptr_nested-8 8.00 ± 0% 4.00 ± 0% -50.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_ptr_nested-8 7.00 ± 0% 3.00 ± 0% -57.14% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Assignables_primitives-8 0.00 0.00 ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_primitives-8 14.0 ± 0% 0.0 -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_primitives-8 28.0 ± 0% 14.0 ± 0% -50.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_primitives-8 0.00 0.00 ~ (all equal)
_Mapper_BindPrepare/Bind_Assignables_sale-8 0.00 0.00 ~ (all equal)
_Mapper_BindPrepare/Bind_Fields_sale-8 15.0 ± 0% 0.0 -100.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Field_sale-8 30.0 ± 0% 15.0 ± 0% -50.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Bind_Set_sale-8 8.00 ± 0% 9.00 ± 0% +12.50% (p=0.008 n=5+5)
```
## `PreparedMapping`
The previous section highlights the improved performance of the BoundMapping type. This section compares the new `PreparedMapping` type with the improved BoundMapping implementation.
`PreparedMapping`
```
BenchmarkMapper/Prepare_Rebind-8 1918274 615.4 ns/op 128 B/op 8 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_unknown1-8 4470338 267.8 ns/op 256 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_unknown2-8 4394802 271.8 ns/op 256 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Assignables_simple-8 18621049 63.62 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Fields_simple-8 16888491 71.54 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Field_simple-8 4905577 243.6 ns/op 48 B/op 2 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Set_simple-8 6336757 185.9 ns/op 24 B/op 1 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Assignables_nested-8 9975766 121.7 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Fields_nested-8 8327191 141.4 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Field_nested-8 2453205 488.3 ns/op 96 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Set_nested-8 2398924 495.6 ns/op 72 B/op 3 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Assignables_ptr_nested-8 8590812 138.5 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Fields_ptr_nested-8 7554633 152.3 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Field_ptr_nested-8 2311070 519.9 ns/op 96 B/op 4 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Set_ptr_nested-8 2350860 517.4 ns/op 72 B/op 3 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Assignables_primitives-8 3920596 307.2 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Fields_primitives-8 3121963 398.8 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Field_primitives-8 641995 1828 ns/op 336 B/op 14 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Set_primitives-8 3842169 302.5 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Assignables_sale-8 2836902 427.5 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Fields_sale-8 2350030 521.0 ns/op 0 B/op 0 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Field_sale-8 585480 2038 ns/op 360 B/op 15 allocs/op
Benchmark_Mapper_BindPrepare/Prepare_Set_sale-8 1000000 1124 ns/op 280 B/op 9 allocs/op
```
Compared against BoundMapping with `benchstat`
```
name old time/op new time/op delta
Mapper/Rebind-8 808ns ± 2% 614ns ± 1% -24.05% (p=0.008 n=5+5)
_Mapper_BindPrepare/unaddr1-8 331ns ± 0% 232ns ± 0% -29.89% (p=0.008 n=5+5)
_Mapper_BindPrepare/unaddr2-8 335ns ± 1% 233ns ± 0% -30.58% (p=0.008 n=5+5)
_Mapper_BindPrepare/unknown1-8 584ns ± 0% 269ns ± 1% -54.01% (p=0.008 n=5+5)
_Mapper_BindPrepare/unknown2-8 593ns ± 0% 269ns ± 3% -54.56% (p=0.008 n=5+5)
_Mapper_BindPrepare/Assignables_simple-8 84.2ns ± 2% 63.4ns ± 2% -24.71% (p=0.008 n=5+5)
_Mapper_BindPrepare/Fields_simple-8 93.5ns ± 2% 71.8ns ± 1% -23.28% (p=0.008 n=5+5)
_Mapper_BindPrepare/Field_simple-8 261ns ± 1% 245ns ± 0% -6.32% (p=0.008 n=5+5)
_Mapper_BindPrepare/Set_simple-8 203ns ± 1% 188ns ± 1% -7.30% (p=0.008 n=5+5)
_Mapper_BindPrepare/Assignables_nested-8 162ns ± 3% 121ns ± 1% -24.89% (p=0.008 n=5+5)
_Mapper_BindPrepare/Fields_nested-8 182ns ± 2% 142ns ± 2% -21.56% (p=0.008 n=5+5)
_Mapper_BindPrepare/Field_nested-8 526ns ± 0% 488ns ± 1% -7.23% (p=0.008 n=5+5)
_Mapper_BindPrepare/Set_nested-8 525ns ± 0% 501ns ± 2% -4.62% (p=0.008 n=5+5)
_Mapper_BindPrepare/Assignables_ptr_nested-8 173ns ± 3% 139ns ± 1% -19.71% (p=0.008 n=5+5)
_Mapper_BindPrepare/Fields_ptr_nested-8 192ns ± 3% 152ns ± 1% -21.04% (p=0.008 n=5+5)
_Mapper_BindPrepare/Field_ptr_nested-8 550ns ± 1% 511ns ± 0% -6.97% (p=0.008 n=5+5)
_Mapper_BindPrepare/Set_ptr_nested-8 546ns ± 0% 517ns ± 0% -5.28% (p=0.008 n=5+5)
_Mapper_BindPrepare/Assignables_primitives-8 546ns ± 2% 304ns ± 1% -44.27% (p=0.008 n=5+5)
_Mapper_BindPrepare/Fields_primitives-8 599ns ± 2% 396ns ± 2% -34.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Field_primitives-8 2.02µs ± 1% 1.76µs ± 0% -12.96% (p=0.008 n=5+5)
_Mapper_BindPrepare/Set_primitives-8 454ns ± 0% 303ns ± 3% -33.41% (p=0.016 n=4+5)
_Mapper_BindPrepare/Assignables_sale-8 662ns ± 2% 421ns ± 1% -36.49% (p=0.008 n=5+5)
_Mapper_BindPrepare/Fields_sale-8 745ns ± 5% 514ns ± 2% -31.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Field_sale-8 2.34µs ± 1% 1.99µs ± 1% -15.00% (p=0.008 n=5+5)
_Mapper_BindPrepare/Set_sale-8 1.36µs ± 2% 1.13µs ± 2% -16.80% (p=0.008 n=5+5)
```