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package textproto

import (
	"net/textproto"
	"runtime"
	"sync"
)

// CanonincalMIMEHeaderKey is like textproto.CanonicalMIMEHeaderKey but it
// memoizes results to avoid repeated allocations of the same string.

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package maps

type ReadMostlyMap[K comparable, V any] struct {
	mu sync.Mutex
	m atomic.Pointer // map[K]V
}

func map2ptr[K comparable, V any](m map[K]V) unsafe.Pointer {
	im := any(m)
	return *(*unsafe.Pointer)(unsafe.Pointer(&im))

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Verifying that I control the following Nostr public key: npub1j67s9mwffj6ue909esy4ldyhte9xheu5nh2lwed2qycqfdmfjmuq40chpa

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Language/syntax

Shorthand error definition

Instead of things like var ErrFoo = errors.New("foo") or return fmt.Errorf("foo: %d", n) I would like a shorthand syntax that allows to define a new error type.

Simple error

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package bulkinsert

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"strings"
)

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package mysql

import (
	"bytes"
	"context"
	"database/sql"
	"encoding/csv"
	"errors"
	"fmt"
	"io"

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package xsync

import "sync"

type TryLocker interface {
  sync.Locker // Lock(); Unlock()
  TryLock() bool
}

// LockAndDo will acquire the lock l and execute fn.

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package batchgetter

type Getter[I, T any] interface {
  Get(context.Context, []I) ([]T, error)
}

type BatchGetter[I, T any] struct {
  parent Getter[I, T]
  batchWait time.Duration
  

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package main

import "fmt"

func genOptIface(name string, opt ...string) {
	if len(opt) == 0 {
		panic("zero opt types")
	}
	if len(opt) > 10 {
		panic("too many opt types")

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#include <immintrin.h>
#include <stdint.h>

int getIndexOf(__m512i const *values, int64_t target)
{
    __m512i valuesSimd = _mm512_loadu_si512(values);
    __m512i targetSplatted = _mm512_set1_epi64(target);
    __mmask8 equalMask = _mm512_cmpeq_epi64_mask(valuesSimd, targetSplatted);
    uint32_t equalMaskInt = _cvtmask8_u32(equalMask);
    int index = _tzcnt_u32(equalMaskInt);