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using a function that takes "char *filename" as argument

using a function that takes "char *filename" as argument

using a function that takes "char *filename" as argument


I have a function that takes this as argument:

char *filename

It is a pointer to char array, I guess. I can use this function by specifying directly the filename argument. Something like this:


But I cannot do that because the filename is loaded by the application and I store it in a string inside a vector. So when I would like to use I should do it like this:


but this will give a me a compilation error saying that myFunction doesn't have overloaded method for this argument.

Now: myVector[0] is a string, exactly like "filename.txt". So why it doesn't work? Does someone can enlight?


RE: using a function that takes "char *filename" as argument

Well C neither has vectors, nor overloaded methods.

Perhaps you're compiling this as C++, and what you have is something like


std::vector< std::string > myVector;

If this is so, then perhaps this will work for you.


myFunction( myVector[0].c_str() );

If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.

RE: using a function that takes "char *filename" as argument

But then you'll also have to cast away the const, since your function isn't const correct.


myFunction( const_cast<char*>(myVector[0].c_str()) );

Although, in the unlikely chance that your function does actually modify the filename, you should copy it to a non-const array first.

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