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version 2.089.0

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Function std.algorithm.searching.minIndex

Computes the index of the first occurrence of range's minimum element.

ptrdiff_t minIndex(alias pred, Range) (
  Range range
)
if (isInputRange!Range && !isInfinite!Range && is(typeof(binaryFun!pred(range.front, range.front))));

Parameters

NameDescription
pred The ordering predicate to use to determine the minimum element.
range The input range to search.

Complexity

Ο(range.length) Exactly range.length - 1 comparisons are needed.

Returns

The index of the first encounter of the minimum element in range. If the range is empty, -1 is returned.

See Also

maxIndex, min, minCount, minElement, minPos

Example

int[] a = [2, 3, 4, 1, 2, 4, 1, 1, 2];

// Minimum is 1 and first occurs in position 3
writeln(a.minIndex); // 3
// Get maximum index with minIndex
writeln(a.minIndex!"a > b"); // 2

// Range is empty, so return value is -1
int[] b;
writeln(b.minIndex); // -1

// Works with more custom types
struct Dog { int age; }
Dog[] dogs = [Dog(10), Dog(5), Dog(15)];
writeln(dogs.minIndex!"a.age < b.age"); // 1

Authors

Andrei Alexandrescu

License

Boost License 1.0.