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When doing a compare, why must I cast an unsigned to avoid warnings


When doing a compare, why must I cast an unsigned to avoid warnings

By : Tomoko Kwan
Date : November 21 2020, 11:01 PM
this one helps. You're comparing the attribute of the uint1_p parser to 4. The attribute type of uint1_p{} is unsigned, so you're comparing unsigned with decltype(4), which is int.
Doing mixed-sign comparisons is dangerous and the compiler warns about that. The problem is that unsigned integer arithmetic is "contagious", meaning that the 4 will be promoted to unsigned, not the other way around. This is a risk if you had e.g. _1 >= 0 because it could never be false.
code :
#include <iostream>
int main() {
    for (unsigned i = 10; i >= 0; --i)
        std::cout << i << " ";
}
prog.cc:3:29: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
     for (unsigned i = 10; i >= 0; --i)
                           ~~^~~~
bool retVal = qi::parse(f, l, uint1_p[_pass = (_1 <= 4u)] >> qi::uint_, pVal[0], pVal[1]);


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Could this C cast to avoid a signed/unsigned comparison make any sense?

Could this C cast to avoid a signed/unsigned comparison make any sense?


By : George Mlay
Date : March 29 2020, 07:55 AM
help you fix your problem No, that is probably the reason. Plus the fact that the vector would probably never be so long that it would risk truncating the size (the app. developer would know that).
And... maybe in some parts of the program he actually compared "size" with something else that was int-typed, so making size a "size_t" type would fix it in one place, but break it somewhere else.
How to avoid unchecked cast warnings with Java Generics

How to avoid unchecked cast warnings with Java Generics


By : Jose Garcia Vivas Mi
Date : March 29 2020, 07:55 AM
Any of those help You're getting warnings because what you're doing can't be proved to be safe. You're assuming that getInstance(colTypeL) will return an Extractor - but that can't be verified at either compile-time or execution time.
You can use @SuppressWarnings("unchecked") as mentioned by others, but I would try to rethink the design somewhat.
Approved way to avoid lvalue cast warnings and errors?

Approved way to avoid lvalue cast warnings and errors?


By : Dave Haggblad
Date : March 29 2020, 07:55 AM
help you fix your problem The JoGusto answer is (a) not very good, and (b) on a C question.
code :
int x = some_integer_expression;
memcpy(chrPtrValue, &x, sizeof x);
Static cast to avoid IDE warnings?

Static cast to avoid IDE warnings?


By : Vatseq
Date : March 29 2020, 07:55 AM
seems to work fine Here's a general chain of principle, that should contain an answer :-)
Any Build must be completely Warning Free. (/WX or whatever you have) You should enable as many warnings as possible. You should avoid C-style casts, because they will come back to bite you. A static_cast does never incur more performance cost than an implicit cast would. (Which is often 0.) When possible, use the exact type. (e.g. use integer or floating point literal type postfixes) When you can't match the exact type, because two functions (or ...) expect different, but compatible types, and if the implicit conversion triggers a waring, use static_cast (!) If the implicit conversion triggers a warning, this is most likely because the conversion is lossy or otherwise problematic in some edge cases. Consider writing shim functions (possibly with additional run time checking) for these lossy casts.
How to avoid unsafe cast warnings with Java Generics

How to avoid unsafe cast warnings with Java Generics


By : Maninder khurana
Date : March 29 2020, 07:55 AM
should help you out Your extractors aren't really generic at all. It sounds like you want something like:
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