C++ syntax

In this line of C++ code ;

Code:

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int permissions = (mode == QSharedMemory::ReadOnly ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS);

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what does the question mark mean and the colon mean

It´s the ternary operator, it´s syntax is "exp ? A : B". When the exp evaluates to true, its return value is A, else it´s B.

Quote:

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Originally Posted by aamir121a

In this line of C++ code ;

Code:

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int permissions = (mode == QSharedMemory::ReadOnly ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS);

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what does the question mark mean and the colon mean

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Think of it like

Code:

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if(mode == QSharedMemory::ReadOnly)
    permissions = FILE_MAP_READ;
else
    permissions = FILE_MAP_ALL_ACCESS;

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thank you all as always you have been most helpful