problem with std::map find()

[Manuel Maria Diaz Gomez]

Hi everybody,

This should be trivial, but I just can't see it.
The following statement in a method doesn't work for me:
(there's only one entry in myMap)

map<const char*, int>::const_iterator it = myMap.find(key);

where key is a const char* passed by the class method.

However, if I do:

map<const char*, int>::const_iterator it = registry.begin();

Then the iterator points to the right value, and (*it).first displays the
right key.
I have checked the key value being passed to find() and is correct, so that
shouldn't be a problem...


Any hints?

Cheers



--
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Manuel Diaz-Gomez | ATLAS Bldg. 32/SB-008 tel. +41 22 76 76304
CERN EP Division
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SWITZERLAND
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[Walter Tross]

map<const char*, int>::const_iterator it = myMap.find(key);

Your map compares C-string addresses, not C-string contents

 

[Jeff Schwab]

Hi everybody,

This should be trivial, but I just can't see it.
The following statement in a method doesn't work for me:
(there's only one entry in myMap)

map<const char*, int>::const_iterator it = myMap.find(key);

where key is a const char* passed by the class method.

However, if I do:

map<const char*, int>::const_iterator it = registry.begin();

Then the iterator points to the right value, and (*it).first displays the
right key.
I have checked the key value being passed to find() and is correct, so that
shouldn't be a problem...


Any hints?

What Walter said.

Use std::string instead of const char* as the key type.

 

[Manuel Maria Diaz Gomez]

That solved the problem!!

Thanks!

Manuel