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C++のを真似ようと思ったのですが、なんだか普通になってしまいました。入力はリテラル、出力はコンパイラメッセージで。

出力:

123
234.5k
345.6M
456.7G
567.8T
d202.d(39): static assert  "done!"

static import std.metastrings;

struct None { enum Symbol = "",  Base = 1;    }
struct Kilo { enum Symbol = "k", Base = 1e+3; }
struct Mega { enum Symbol = "M", Base = 1e+6; }
struct Giga { enum Symbol = "G", Base = 1e+9; }
struct Tera { enum Symbol = "T", Base = 1e12; }

template SIPrefix(long n) {
    static if(n < Kilo.Base)
        alias None SIPrefix;
    else static if(n < Mega.Base)
        alias Kilo SIPrefix;
    else static if(n < Giga.Base)
        alias Mega SIPrefix;
    else static if(n < Tera.Base)
        alias Giga SIPrefix;
    else
        alias Tera SIPrefix;
}

template SIFormat(long n) {
    enum SIFormat = ToString!(n / SIPrefix!(n).Base) ~ SIPrefix!(n).Symbol;
}

private template ToString(real x) {
    enum ToString = ToString!(cast(long)x) ~ "." ~ ToString!(cast(long)(x * 10))[$ - 1];
}
private template ToString(long x) {
    enum ToString = std.metastrings.ToString!(x);
}


pragma(msg, SIFormat!(123));
pragma(msg, SIFormat!(234567));
pragma(msg, SIFormat!(345678901));
pragma(msg, SIFormat!(456789012345));
pragma(msg, SIFormat!(567890123456789));

static assert(false, "done!"); // コンパイル終了

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