The OpenD Programming Language

Tuple.toString

Formats Tuple with either %s, %(inner%) or %(inner%|sep%).

$(TABLE2 Formats supported by Tuple, $(THEAD Format, Description) $(TROW $(P `%s`), $(P Format like `Tuple!(types)(elements formatted with %s each)`.)) $(TROW $(P `%(inner%)`), $(P The format `inner` is applied the expanded `Tuple`$(COMMA) so it may contain as many formats as the `Tuple` has fields.)) $(TROW $(P `%(inner%|sep%)`), $(P The format `inner` is one format$(COMMA) that is applied on all fields of the `Tuple`. The inner format must be compatible to all of them.)))

  1. string toString()
  2. void toString(DG sink)
    struct Tuple
    const
    void
    toString
    (
    DG
    )
    (
    scope DG sink
    )
  3. void toString(DG sink, FormatSpec!Char fmt)

Parameters

sink DG

A char accepting delegate

Examples

import std.format : format;

Tuple!(int, double)[3] tupList = [ tuple(1, 1.0), tuple(2, 4.0), tuple(3, 9.0) ];

// Default format
assert(format("%s", tuple("a", 1)) == `Tuple!(string, int)("a", 1)`);

// One Format for each individual component
assert(format("%(%#x v %.4f w %#x%)", tuple(1, 1.0, 10))         == `0x1 v 1.0000 w 0xa`);
assert(format(  "%#x v %.4f w %#x"  , tuple(1, 1.0, 10).expand)  == `0x1 v 1.0000 w 0xa`);

// One Format for all components
assert(format("%(>%s<%| & %)", tuple("abc", 1, 2.3, [4, 5])) == `>abc< & >1< & >2.3< & >[4, 5]<`);

// Array of Tuples
assert(format("%(%(f(%d) = %.1f%);  %)", tupList) == `f(1) = 1.0;  f(2) = 4.0;  f(3) = 9.0`);
import std.exception : assertThrown;
import std.format : format, FormatException;

// Error: %( %) missing.
assertThrown!FormatException(
    format("%d, %f", tuple(1, 2.0)) == `1, 2.0`
);

// Error: %( %| %) missing.
assertThrown!FormatException(
    format("%d", tuple(1, 2)) == `1, 2`
);

// Error: %d inadequate for double
assertThrown!FormatException(
    format("%(%d%|, %)", tuple(1, 2.0)) == `1, 2.0`
);

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