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Can someone explain what happens when size_t, or any other type identifier, is wrapped in parentheses. I know it is the old typecast syntax but in this context I don't follow what is happening.
I've seen it for defining the max size of a type as:
size_t max_size = (size_t)-1
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size_t type is a base unsigned integer type of C/C++ language. It is the type of the result returned by sizeof operator. The type's size is chosen so that it can store the maximum size of a theoretically possible array of any type. On a 32-bit system size_t will take 32 bits, on a 64-bit one 64 bits.
size_t is an unsigned integral data type which is defined in various header files such as: <stddef.h>, <stdio.h>, <stdlib.h>, <string.h>, < time .h>, <wchar.h> It's a type which is used to represent the size of objects in bytes and is therefore used as the return type by the sizeof operator.
The size_t datatype in C/C++ Essentially, size_t is an unsigned datatype. This means that it can't be negative.
Yes, size_t is guaranteed to be an unsigned type.
This code (unnecessarily) casts -1 to size_t. The most probable intent was getting the largest possible value of size_t on this system.
Although this code doesn't have Undefined Behavior, this code is ugly - in C++ you should use std::numeric_limits<size_t>::max() and in C use SIZE_MAX macro for exactly a purpose of getting the largest size_t value.
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(size_t)-1 is in fact the equivalent of size_t(-1)
See also the following question c cast syntax styles
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