Map with struct as key and vector as value Post: 302917422

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Top Forums Programming Map with struct as key and vector as value Post 302917422 by Corona688 on Tuesday 16th of September 2014 02:14:56 PM

09-16-2014

Registered User

Quote:

Originally Posted by yifangt

Of course each unique student ID should be stored only once but not the student name, cases are students with same name but different ID number.

So?

Code:

names[1234]="Joe";
names[1235]="Joe";

Two students, same name, zero problems.

Quote:

Thanks anyway and I will try using your method first then go back to the map<struct, vector<struct>> method, only for practice purpose to make a running code. Thanks a lot again!

To make your structure usable in a map, you should define an 'operator <' for it.

Code:

class asdf {
public:
        bool operator <(const asdf &rhs) const {
                // Return true if this class is less than RHS,
                // false otherwise
        }
};

How to do so can be fiendishly complex for complicated data, since you first need a coherent definition of what 'less' even means when comparing two student class records.

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LEARN ABOUT PHP

openssl_spki_export_challenge

OPENSSL_SPKI_EXPORT_CHALLENGE(3)					 1					  OPENSSL_SPKI_EXPORT_CHALLENGE(3)

openssl_spki_export_challenge - Exports the challenge assoicated with a signed public key and challenge

SYNOPSIS

       string openssl_spki_export_challenge (string  &$spkac)

DESCRIPTION

	Exports challenge from encoded signed public key and challenge

PARAMETERS

	      o $spkac
		- Expects a valid signed public key and challenge

RETURN VALUES

	Returns the associated challenge string or NULL on failure.

ERRORS
/EXCEPTIONS
	Emits an E_WARNING level error if an invalid argument is passed via the $spkac parameter.

EXAMPLES

       Example #1

	      openssl_spki_export_challenge(3) example

	       Extracts the associated challenge string or NULL on failure.

	      <?php
	      $pkey = openssl_pkey_new('secret password');
	      $spkac = openssl_spki_new($pkey, 'challenge string');
	      $challenge = openssl_spki_export_challenge(preg_replace('/SPKAC=/', '', $spkac));
	      ?>

       Example #2

	      openssl_spki_export_challenge(3) example from <keygen>

	       Extracts the associated challenge string issued from the <keygen> element

	      <?php
	      $challenge = openssl_spki_export_challenge(preg_replace('/SPKAC=/', '', $_POST['spkac']));
	      ?>
	      <keygen name="spkac" challenge="challenge string" keytype="RSA">

SEE ALSO

       openssl_spki_new(3), openssl_spki_verify(3), openssl_spki_export(3), openssl_md_method(3), openssl_csr_new(3), openssl_csr_sign(3).

PHP Documentation Group 											  OPENSSL_SPKI_EXPORT_CHALLENGE(3)