Standard Template Library (STL) is a set of C++ libraries that provide generic algorithms and data structures. LAD (Ladder Logic) is a graphical programming language that is used to program PLCs (programmable logic controllers).
Converting STL to LAD can be challenging, as the two languages have different syntax and semantics. However, it is possible to convert some STL constructs to LAD, using a combination of ladder logic elements and structured text.
STL Constructs and LAD Equivalents
| STL Construct | LAD Equivalent |
|---|---|
| vector<int> v; | Array[0..9] of INT |
| v.push_back(10); | Array[10] := 10 |
| for (int i = 0; i < v.size(); i++) { cout << v[i] << " "; } | FOR i := 0 TO 9 BY 1 DO Write(Array[i]) Write(" ") END_FOR |
| map<string, int> m; | Structured Text: VAR m: ARRAY[0..9] OF STRUCT key: STRING(10); value: INT; END_VAR |
| m["name"] = 10; | Structured Text: m[0].key := "name"; m[0].value := 10; |
| for (auto it = m.begin(); it != m.end(); it++) { cout << it->first << " " << it->second << " "; } | Structured Text: FOR i := 0 TO 9 BY 1 DO Write(m[i].key) Write(" ") Write(m[i].value) Write(" ") END_FOR |
Example Program
Consider the following STL program:
include <iostream>
include <vector>
include <map>
using namespace std;
int main() {
vector<int> v;
for (int i = 0; i < 10; i++) {
v.push_back(i);
}
for (int i = 0; i < v.size(); i++) {
cout << v[i] << " ";
}
cout << endl;
map<string, int> m;
m["name"] = 10;
m["age"] = 20;
for (auto it = m.begin(); it != m.end(); it++) {
cout << it->first << " " << it->second << " ";
}
cout << endl;
return 0;
}
The equivalent LAD program would be:
Array[0..9] of INT
FOR i := 0 TO 9 BY 1 DO
Array[i] := i
END_FOR
FOR i := 0 TO 9 BY 1 DO
Write(Array[i])
Write(" ")
END_FOR
Write(EOL)
Structured Text:
VAR
m: ARRAY[0..9] OF STRUCT
key: STRING(10);
value: INT;
END_VAR
m[0].key :="name";
m[0].value := 10;
m[1].key := "age";
m[1].value := 20;
FOR i := 0 TO 9 BY 1 DO
Write(m[i].key)
Write(" ")
Write(m[i].value)
Write(" ")
END_FOR
Write(EOL)
Conclusion
Converting STL to LAD can be done, but it requires careful consideration of the different syntax and semantics of the two languages. By using a combination of ladder logic elements and structured text, it is possible to convert most STL constructs to LAD.
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