firstworks Programming with Rudiments using the environment class

Using the environment class

The environment class provides methods for accessing and manipulating environment variables.

> #include <rudiments/environment.h>
> #include <rudiments/stdio.h>
> int main(int argc, const char **argv) {
> // Print the PATH environment variable.
> stdoutput.printf("PATH=%s\n\n",environment::getValue("PATH"));
> // Set TEST=testvalue and print the TEST.
> environment::setValue("TEST","testvalue");
> stdoutput.printf("TEST=%s\n\n",environment::getValue("TEST"));
> // Remove TEST and print it.
> environment::remove("TEST");
> stdoutput.printf("TEST=%s\n\n",environment::getValue("TEST"));
> // Print all environment variable/value pairs.
> stdoutput.write("All Variables:\n");
> for (const char * const *v=environment::variables(); v && *v; v++) {
> stdoutput.printf("%s\n",*v);
> }
> stdoutput.write('\n');
> // Clear the environment and atttempt to print all
> // environment variable/value pairs. Should print nothing.
> environment::clear();
> stdoutput.write("All Variables (should be empty now):\n");
> for (const char * const *v=environment::variables(); v && *v; v++) {
> stdoutput.printf("%s\n",*v);
> }
> stdoutput.write('\n');
> }