69 lines
2.1 KiB
D
69 lines
2.1 KiB
D
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import core.stdc.stdarg, std.conv;
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string dToString(string type, ...)
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{
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va_list args_list;
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va_copy(args_list, _argptr);
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scope(exit) va_end(args_list);
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switch (type) {
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case "int":
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assert(_arguments.length == 1 && _arguments[0] is typeid(int), "Аргумент должен иметь тип int.");
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auto int_val = va_arg!int(args_list);
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return to!string(int_val);
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case "double":
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assert(_arguments.length == 1 && _arguments[0] is typeid(double), "Аргумент должен иметь тип double.");
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auto double_val = va_arg!double(args_list);
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return to!string(double_val);
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case "complex":
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assert(_arguments.length == 2 && _arguments[0] is typeid(double) && _arguments[1] is typeid(double), "Для типа complex должны быть переданы два аргумента типа double.");
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auto re_val = va_arg!double(args_list);
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auto im_val = va_arg!double(args_list);
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return to!string(re_val) ~ " + " ~ to!string(im_val) ~ "i";
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case "string":
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assert(_arguments.length == 1 && _arguments[0] is typeid(string), "Аргумент должен иметь тип string.");
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return va_arg!string(args_list).idup;
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default:
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assert(0);
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}
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}
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unittest
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{
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assert(dToString("int", 5) == "5");
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assert(dToString("double", 2.0) == "2");
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assert(dToString("string", "Test string") == "Test string");
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assert(dToString("complex", 3.5, 2.7) == "3.5 + 2.7i");
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}
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import std.stdio, std.variant;
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void pseudoVariadic(Variant[] vars)
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{
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foreach (var; vars)
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{
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if (var.type == typeid(string))
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{
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writeln("Строка: ", var.get!string);
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}
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else if (var.type == typeid(int))
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{
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writeln("Целое число: ", var.get!int);
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}
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else
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{
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writeln("Незнакомый тип: ", var.type);
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}
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}
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}
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void templatedVariadic(T...)(T args)
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{
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pseudoVariadic(variantArray(args));
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}
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void main()
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{
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templatedVariadic("Здравствуй, мир!", 42);
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}
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