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Is it possible to include a type `T`'s string expansion into the error message given by `static_assert`?


Is it possible to include a type `T`'s string expansion into the error message given by `static_assert`?

By : user2954173
Date : November 22 2020, 01:01 AM
this will help Quoting from the poor(lazy?) man's version of the C++ Standard,
code :


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Typescript Error Message error TS2173: Generic type references must include all type arguments

Typescript Error Message error TS2173: Generic type references must include all type arguments


By : xCopyrightPvP
Date : March 29 2020, 07:55 AM
will help you That line should have been:
code :
promise(type?: any, target?: any): JQueryPromise<any>;
How to give nice static_assert message to users when the template return type prevents it from instantiation?

How to give nice static_assert message to users when the template return type prevents it from instantiation?


By : Anton Balyan
Date : March 29 2020, 07:55 AM
seems to work fine Until we have concept, you may add an extra layer to allow to have static_assert and avoid SFINAE:
code :
// Your SFINAE function:
template<typename C>
auto pointer_to_first_impl(C& c) ->   decltype(&(*c.begin())){
  return nullptr;// TODO: implement
}

template<typename C>
decltype(auto) pointer_to_first(C& c)
{
    // You need to implement the traits for the check
    static_assert(my_cond<C>::value, "type is incorrect");
    return pointer_to_first_impl(c);
}
C++ type name as a literal string for error report in static_assert

C++ type name as a literal string for error report in static_assert


By : Vadim
Date : March 29 2020, 07:55 AM
To fix this issue Classical way to retrieve type for debugging is to use incomplete type:
code :
template <typename> struct Debug;

Debug<Fn1::Domain> d;
How to pass a not explicitly string literal error message to a static_assert?

How to pass a not explicitly string literal error message to a static_assert?


By : user3092360
Date : March 29 2020, 07:55 AM
Any of those help You either have to copy-paste the literal, or use the preprocessor. Per [dcl.dcl]/1 The grammar of static_assert is defined as
code :
static_assert-declaration:
      static_­assert ( constant-expression ) ;
      static_­assert ( constant-expression , string-literal ) ;
static_assert - a way to dynamically customize error message

static_assert - a way to dynamically customize error message


By : Mayur Modi
Date : March 29 2020, 07:55 AM
will help you No, there is not.
However this does not matter so much, because static_assert are evaluated at compile-time, and in case of error the compiler will not only print out the message itself, but it will also print the instanciation stack (in case of templates).
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