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import std.stdio, std.file, std.algorithm, std.conv; | |
void main() { | |
dirEntries("data", "*.out", SpanMode.shallow) | |
.map!(e => File(e.name).byLine(KeepTerminator.yes) | |
// Option 1: | |
//.map!(l => l.to!string())() | |
//.array() | |
// -- OR -- | |
// Option 2: | |
//.map!(l => l.to!string())() | |
//.wrap() | |
// -- OR -- | |
// Option 3: | |
//.refMap!(l => l.to!string())() | |
// -- OR -- | |
// My current solution: | |
.map!(l => l.to!string())() | |
.cached() | |
)() | |
.array() | |
.nWayUnion() | |
.copy(stdout.lockingTextWriter); | |
} | |
import std.range; | |
auto wrap(R)(R range) { | |
return new Wrap!R(range); | |
} | |
class Wrap(R) { | |
alias E = ElementType!R; | |
R _range; | |
this(R r) { | |
_range = r; | |
} | |
@property E front() { return _range.front; } | |
@property bool empty() { return _range.empty; } | |
void popFront() { _range.popFront; } | |
} | |
auto refMap(alias f, R)(R range) { | |
return new RefMapResult!(f,R)(range); | |
} | |
class RefMapResult(alias f, R) { | |
alias E = typeof(f(ElementType!R.init)); | |
R _range; | |
E _front; | |
this(R r) { | |
_range = r; | |
if(!_range.empty) | |
_front = f(_range.front); | |
} | |
@property E front() { | |
return _front; | |
} | |
@property bool empty() { | |
return _range.empty; | |
} | |
void popFront() { | |
_range.popFront(); | |
if(!_range.empty) | |
_front = f(_range.front); | |
} | |
} | |
auto cached(R)(R range) { | |
return new CacheWrap!R(range); | |
} | |
class CacheWrap(R) { | |
alias E = ElementType!R; | |
R _range; | |
E _front; | |
this(R r) { | |
_range = r; | |
if(!_range.empty) | |
_front = _range.front; | |
} | |
@property E front() { return _front; } | |
@property bool empty() { return _range.empty; } | |
void popFront() { | |
_range.popFront; | |
if(!_range.empty) | |
_front = _range.front; | |
} | |
} |
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