ifstream &operator>>(ifstream &stream, vector<command> &nCommand)
{
string line;
vector<string> parts;
vector<string> commands;
int commandPerLine;
getline(stream, line);
stringSplit(line, ";", parts); //splits the <1. argument> at every <2. argument> and stores it in <3. argument>
commandPerLine = parts.size();
for(int i=0; i < commandPerLine; i++)
{
stringSplit(parts, " ", commands);
nCommand.push_back(commands[0]); //the constructor of command stores the argument in command.name (in the example above it would be "name_of_command" or "resolution")
for(int j=0; j<3; j++) //the "value array" is limited to 3 values
{
nCommand.back().value[j] = commands[j+1]; //thats strange, but I don't know how to do it better :D
}
}
return stream;
}
}
reading 'commands' from a file
Author
Hello everyone,
i have a little problem with the following:
I want for my program (a game) something like a configuration file, where you can write something like this: "resolution 800 600" and the program changes its resolution to 800x600 (after restarting it, of course ;))
I thought of this syntax:
name_of_command value1 value2 value3 .. ; name_of_command2 value4;
Here is what I tried:
1) open the file
2) read a line (not perfect: what if the command is longer than 1 line?)
3) split the string after every ";" and store the parts in a vector1
4) split every element of the vector at every whitespace and store the results in a new vector2
5) now save everything in a vector of a class:
the first element of vector2 would be class.name, the rest in an array of the class.
Then I would have every command (with its values), thats in the first line of the file, in in an own object of a class.
But its not working.
Here's the code:
(I thought it would be awesome if overload an operator for this ( :roll: ))
You can use any character with std::getline, you can use this to separate the commands by semicolons. You can then use std::stringstream rather than splitting the string up.
Then the function that reads a command from the stream can be quite simple, because the stream will naturally split by whitespace.
std::ostream& operator>>(std::ostream &stream, Command &command);#include <sstream>std::ostream &operator>>(std::ostream &in, std::vector<Command> &commands){ std::string text; while(std::getline(in, text. ';')) { Command command; std::stringstream stream(text); if(! (stream >> command) ) { // error handling } } return stream;}Then the function that reads a command from the stream can be quite simple, because the stream will naturally split by whitespace.
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