typedef std::map<std::string, std::vector<std::string> > TEXTUREFILENAMES;
m_pTextureFileNames = m_pTextureLoader->GetTextureFileNames();
//for each directory
for(TEXTUREFILENAMES::const_iterator it = m_pTextureFileNames->begin(); it != m_pTextureFileNames->end(); it++)
{
//for each texture
for(DWORD c = 0, d = 0; d < it->second.size(); c++, d++)
{
//Do something
}
}
Iterate trough std::map
Author
My program crashes when I iterate through a std::map. m_pTextureLoader is a pointer to an object that loads textures (the file names) from directories and stores them in a std::map. The key in the map is the directory of the loaded texture and the second, a std::vector, contains strings for every available texture in that directory. The texture loader has a function that returns a pointer to the texture map. When I iterate through the map, the program crashes when it reaches it++ (which is after the first directory).
Make sure that "do something" does not erase the iterator or delete the map.
[edited by - DrPizza on January 6, 2004 4:10:22 PM]
[edited by - DrPizza on January 6, 2004 4:10:22 PM]
Hum, could it be that you have it++ ?
try having ++it instead or otherwise the first iterator might get wrong?
Not sure why... but try that?
try having ++it instead or otherwise the first iterator might get wrong?
Not sure why... but try that?
I think that the for loop might mess it up; on the last iteration, i.e. end-1, the condition is still fulfilled. But on the next step, it gets incremented, so on the last loop, you''re actually modifying a non-existent entry.
To simplify everything, I just use
To simplify everything, I just use
while( it != m_pTextureFilesNames.end() ) { // code ... // next iteration ++it;} 
quote:Original post by psykr
I think that the for loop might mess it up; on the last iteration, i.e. end-1, the condition is still fulfilled. But on the next step, it gets incremented, so on the last loop, you''re actually modifying a non-existent entry.
The loop is correct.
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