27 lines
806 B
D
27 lines
806 B
D
module utility;
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auto concat(T : E[n], E, size_t n)(in E[][] args...) @nogc
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{
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size_t offset = 0;
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T result = void;
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foreach(arr; args) {
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result[offset .. offset+arr.length] = arr;
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offset += arr.length;
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}
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assert(offset == result.length);
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return result;
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}
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@safe unittest
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{
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assert(concat!(int[0])() == []);
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assert(concat!(int[0])([]) == []);
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assert(concat!(int[0])([], []) == []);
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assert(concat!(int[1])([1]) == [1]);
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assert(concat!(int[1])([1], []) == [1]);
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assert(concat!(int[1])([], [1]) == [1]);
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assert(concat!(int[2])([1, 2]) == [1, 2]);
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assert(concat!(int[2])([1], [2]) == [1, 2]);
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assert(concat!(int[6])([1], [2, 3], [4, 5, 6]) == [1, 2, 3, 4, 5, 6]);
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assert(concat!(char[12])("Hello", " ", "World!") == "Hello World!");
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}
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