ufcpp

class A(int x)
{
    int _x = x; // これはキャプチャしない。
}

class B(int x)
{
    public int X { get; } = x; // これもキャプチャしない。
}

ufcpp

X.M(0); // 整数リテラルの自然な型は int
X.M(default); // でも、 default は「サイズが小さい型優先」っぽい

// そういう仕様？意図的？

class X
{
    public static void M(int i32) { }
    public static void M(short i16) { }
}

ufcpp

using System.Globalization;
using System.Text.RegularExpressions;
using static System.Console;

var s1 = "a\u0301"; // á = a + ́
var s2 = "\u00e1"; // á

// たとえ InvariantCulture でも。
// <InvariantGlobalization>false</InvariantGlobalization> な限り。
// (↑true のときは、StringComparison.Default が Ordinal になる効果もあり。)

ufcpp

using System.Buffers.Text;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;

var x = 0x12345678;
Console.WriteLine($"{x.Hex()}");

public static class Format
{
    public static AsciiBuffer8 Hex(this int x)

ufcpp

using System.Buffers.Binary;

var x = 0x12345678;

Console.WriteLine($"{x:X}");
Console.WriteLine($"{x.Little()}");

static class LittleEndianExtensions
{
    public static LittleEndianInt32 Little(this int x) => new(x);

ufcpp

class Program
{
    static void X(bool x) { }
    static void X(bool x, bool y) { }
    static bool A<T1, T2>(int x) => true;
    class B { }
    class C { }

    static void Main()
    {

ufcpp

using System.Globalization;
using System.Runtime.CompilerServices;

Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;

static string m(bool condition) => string.Create(
    CultureInfo.GetCultureInfo("fr-fr"), 
    $"direct: {1.5} or {1:c}, nested: {If(condition, $"{1.5}", $"{1:C}")}");

Console.WriteLine(m(true));

ufcpp

using System.Buffers;

public interface IDefaultSpanFormattable : ISpanFormattable
{
    string IFormattable.ToString(string? format, IFormatProvider? formatProvider)
    {
        var buffer = (stackalloc char[512]);
        if (TryFormat(buffer, out var charsWritten, format, formatProvider))
        {
            return new string(buffer[..charsWritten]);

ufcpp

using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;

var nodes = new Node<string>[]
{
    new("a0", 2),
    new("a1", 5),
    new("a2", 1),
    new("a3", -2),
    new("a4", 3),

ufcpp

using System.Text.RegularExpressions;
using System.Windows;

class Program
{
    [STAThread]
    static void Main()
    {
        var x = Clipboard.GetText();