Re: Storing struct in a array
On Tuesday, 9 January 2018 at 19:05:48 UTC, thedeemon wrote:
On Tuesday, 9 January 2018 at 18:09:58 UTC, Vino wrote:
It is possible to store struct in a array ans use the same
in csvReader
Sure, you can just pass the type of your struct to csvReader:
Array!T1 T1s;
reader(fName, T1s); // pass the array Type as a function
parameter
First you write a template function that takes an array of some
generic type and fills it with records from CSV file:
void readData(DataType)(string fname, ref Array!DataType arr) {
foreach (record; fname.readText.csvReader!DataType('\t')) {
arr ~= record;
}
}
Then you can use it in your main program with different types:
struct S1 { string name; string value; int other; }
struct S2 { int a; string b; }
void main () {
...
if (someCondition) {
Array!S1 arr1;
readData("data1.csv", arr1);
} else {
Array!S2 arr2;
readData("data2.csv", arr2);
}
}
A little advice. Kindly pause and spend an evening reading this
book:
http://ddili.org/ders/d.en/
Currently your code pieces look like a soup produced by someone
who still confuses variables and types, and lacks basic
programming skills. Read the book, don't rush with writing
broken code.
Hi Deemon,
I agree that my code is broken code and I am a Newbie in the
world of programming, the confusion begin when i started writing
the second module, and now i was able to find the issue, and the
real requirement. The requirement is as below.
Program: The below program works.
auto reader(MyStruct) (File fname, auto ref MyStruct st) {
alias ColumnTypes = AliasSeq!(MyStruct);
foreach (record;
fname.byLineCopy().joiner("\n").csvReader!(Tuple!ColumnTypes)(null)) {
writeln(record[0], record[1], record[2]);
}
void main () {
auto fname =
File("C:\\Users\\bheev1\\Desktop\\Current\\Script\\Others\\Table2.csv");
auto Table = baseName(stripExtension(fname));
struct S1 { string Name; string Country; int Age; }
S1 Table1s;
reader(File(fname), join([Table, "1s"]));
}
The requirement is as below
The function reader should store the data in column wise Array
and return the same.
Array!has to be taken from the header data as the CSV file has header
Name, Country, Age using records.header)
e.g
Array!string Name; (records.header[0]);
Array!string Country;(records.header[1]);
Array!string Age;(records.header[2]);
and return the above arrays
From,
Vino.B
Re: Storing struct in a array
On Tuesday, 9 January 2018 at 18:09:58 UTC, Vino wrote:
It is possible to store struct in a array ans use the same
in csvReader
Sure, you can just pass the type of your struct to csvReader:
Array!T1 T1s;
reader(fName, T1s); // pass the array Type as a function
parameter
First you write a template function that takes an array of some
generic type and fills it with records from CSV file:
void readData(DataType)(string fname, ref Array!DataType arr) {
foreach (record; fname.readText.csvReader!DataType('\t')) {
arr ~= record;
}
}
Then you can use it in your main program with different types:
struct S1 { string name; string value; int other; }
struct S2 { int a; string b; }
void main () {
...
if (someCondition) {
Array!S1 arr1;
readData("data1.csv", arr1);
} else {
Array!S2 arr2;
readData("data2.csv", arr2);
}
}
A little advice. Kindly pause and spend an evening reading this
book:
http://ddili.org/ders/d.en/
Currently your code pieces look like a soup produced by someone
who still confuses variables and types, and lacks basic
programming skills. Read the book, don't rush with writing broken
code.
Re: Storing struct in a array
On Tuesday, 9 January 2018 at 17:41:10 UTC, Vino wrote:
On Tuesday, 9 January 2018 at 17:00:05 UTC, thedeemon wrote:
On Tuesday, 9 January 2018 at 13:49:41 UTC, Vino wrote:
Hi All,
It is possible to store struct in a array ans use the same
in csvReader
Sure, you can just pass the type of your struct to csvReader:
struct Layout { string name; int value; double other; }
auto readArrayOfStructs(string fname) {
Array!Layout res;
foreach(record; fname.readText.csvReader!Layout('\t')) {
res ~= record;
}
return res;
}
Hi Deemon,
Thank you, and sorry for the confusion, the requirement is as
below
auto reader(T) (Array!T T1s, T fname) {
auto uFile = File(fName, "r");
foreach (record;
uFile.byLineCopy().joiner("\n").csvReader!(Tuple!T1s)) //
receive the type and fetch the record
writeln(record);
}
void main () {
auto fName =
"C:\\Users\\bheev1\\Desktop\\Current\\Script\\Others\\Table1.csv";
struct T1 { string Name; string Country; int Age; }
Array!T1 T1s;
reader(fName, T1s); // pass the array Type as a function
parameter
}
From,
Vino.B
Details
For example let say we have 3 struct
auto read(T) (T Filename, T ArrayType) {
T ArrayType res;
foreach (record;
Filename.byLineCopy().joiner("\n").csvReader!(T)(Tuple!ArrayType))
foreach(i, T; ColumnTypes) { res[i].insert(record[i]); }
}
return res;
}
void main () {
struct S1 { }
struct S2 { }
struct S3 { }
Get user input(UI)
if(UI == S1) {
Array!S1 T1;
writeln(read(File1, Array Type));
}
From,
Vino.B
Re: Storing struct in a array
On Tuesday, 9 January 2018 at 17:00:05 UTC, thedeemon wrote:
On Tuesday, 9 January 2018 at 13:49:41 UTC, Vino wrote:
Hi All,
It is possible to store struct in a array ans use the same in
csvReader
Sure, you can just pass the type of your struct to csvReader:
struct Layout { string name; int value; double other; }
auto readArrayOfStructs(string fname) {
Array!Layout res;
foreach(record; fname.readText.csvReader!Layout('\t')) {
res ~= record;
}
return res;
}
Hi Deemon,
Thank you, and sorry for the confusion, the requirement is as
below
auto reader(T) (Array!T T1s, T fname) {
auto uFile = File(fName, "r");
foreach (record;
uFile.byLineCopy().joiner("\n").csvReader!(Tuple!T1s)) // receive
the type and fetch the record
writeln(record);
}
void main () {
auto fName =
"C:\\Users\\bheev1\\Desktop\\Current\\Script\\Others\\Table1.csv";
struct T1 { string Name; string Country; int Age; }
Array!T1 T1s;
reader(fName, T1s); // pass the array Type as a function parameter
}
From,
Vino.B
Re: Storing struct in a array
On Tuesday, 9 January 2018 at 13:49:41 UTC, Vino wrote:
Hi All,
It is possible to store struct in a array ans use the same in
csvReader
Sure, you can just pass the type of your struct to csvReader:
struct Layout { string name; int value; double other; }
auto readArrayOfStructs(string fname) {
Array!Layout res;
foreach(record; fname.readText.csvReader!Layout('\t')) {
res ~= record;
}
return res;
}
Re: Storing struct in a array
On Tuesday, 9 January 2018 at 13:49:41 UTC, Vino wrote:
Hi All,
It is possible to store struct in a array ans use the same in
csvReader e.g.
import std.stdio;
import std.container.array;
void main () {
Array!string a;
struct Layout { string name; int value; double other; }
a.insert(Layout);
auto record =
uFile.byLineCopy().joiner("\n").csvReader!(Tuple!a[0]))
foreach (record; records)
{
writeln(record.name);
writeln(record.value);
writeln(record.other);
}
From,
Vino.B
Hi All,
Was able to find on hot to store a struct in an array, but not
able to use that array in csvReader
Program:
import std.algorithm: joiner;
import std.container.array;
import std.csv: csvReader;
import std.stdio: File, writeln;
import std.typecons: Tuple, tuple;
void main () {
auto fName =
"C:\\Users\\bheev1\\Desktop\\Current\\Script\\Others\\Table1.csv";
auto uFile = File(fName, "r");
struct T1 { string Name; string Country; int Age; }
Array!T1 T1s;
foreach (record;
uFile.byLineCopy().joiner("\n").csvReader!(Tuple!T1s))
writeln(record);
}
Error:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(523):
Error: template instance parseSpecs!(T1s) cannot use local 'T1s'
as parameter to non-global template
parseSpecs(Specs...)
C:\D\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(635):
Error: CTFE failed because of previous errors in injectNamedFields
ArrayStruct.d(12): Error: template instance
ArrayStruct.main.Tuple!(T1s) error instantiating
Failed: ["dmd", "-v", "-o-", "ArrayStruct.d", "-I."]
From,
Vino.B
Storing struct in a array
Hi All,
It is possible to store struct in a array ans use the same in
csvReader e.g.
import std.stdio;
import std.container.array;
void main () {
Array!string a;
struct Layout { string name; int value; double other; }
a.insert(Layout);
auto record =
uFile.byLineCopy().joiner("\n").csvReader!(Tuple!a[0]))
foreach (record; records)
{
writeln(record.name);
writeln(record.value);
writeln(record.other);
}
From,
Vino.B
