Why this is legal to write uint_64(x)?

Code:

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typedef uint_64 Time;

Time x = 123;
Time y = Time(x);

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The second line looks like a constructor! But Time is nothing more than a build-in type. Is this legal and why?

if uint_64 is a valid typedef then the code is legal.

You are only assigning the value of x to y (you are also doing an unecessary explicit cast).

It is just like writing:

Code:

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int x = 123;
int y = x;

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Laitinen

This is legal although it does not mean those types have a constructor. This syntax helps in template metaprogramming.