compiler-errors

Unable to compile Rust hello world on Windows: linker link.exe not found

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I downloaded and installed the Build Tools for Visual Studio 2019. During installation I selected the C++ tools. It downloaded almost 5GB of data. I restarted the machine after installation and compiling the code worked fine: > cargo run Compiling helloworld v0.1.0 (C:\Users\DELL\helloworld) Finished dev [unoptimized + debuginfo] target(s) in 12.05s Running `target\debug\helloworld.exe` Hello, world!

Anonymous method in Invoke call

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Because Invoke/BeginInvoke accepts Delegate (rather than a typed delegate), you need to tell the compiler what type of delegate to create ; MethodInvoker (2.0) or Action (3.5) are common choices (note they have the same signature); like so: control.Invoke((MethodInvoker) delegate {this.Text = “Hi”;}); If you need to pass in parameters, then “captured variables” are the … Read more

C compile error: “Variable-sized object may not be initialized”

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I am assuming that you are using a C99 compiler (with support for dynamically sized arrays). The problem in your code is that at the time when the compilers sees your variable declaration it cannot know how many elements there are in the array (I am also assuming here, from the compiler error that length … Read more

Fatal error: “No Target Architecture” in Visual Studio

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Use #include <windows.h> instead of #include <windef.h>. From the windows.h wikipedia page: There are a number of child header files that are automatically included with windows.h. Many of these files cannot simply be included by themselves (they are not self-contained), because of dependencies. windef.h is one of the files automatically included with windows.h.

Swift Compiler Error: “Expression too complex” on a string concatenation

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I am not an expert on compilers – I don’t know if this answer will “change how you think in a meaningful way,” but my understanding of the problem is this: It has to do with type inference. Each time you use the + operator, Swift has to search through all of the possible overloads … Read more

C# Error: Parent does not contain a constructor that takes 0 arguments

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Since you don’t explicitly invoke a parent constructor as part of your child class constructor, there is an implicit call to a parameterless parent constructor inserted. That constructor does not exist, and so you get that error. To correct the situation, you need to add an explicit call: public Child(int i) : base(i) { Console.WriteLine(“child”); … Read more

extra qualification error in C++

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This is because you have the following code: class JSONDeserializer { Value JSONDeserializer::ParseValue(TDR type, const json_string& valueString); }; This is not valid C++ but Visual Studio seems to accept it. You need to change it to the following code to be able to compile it with a standard compliant compiler (gcc is more compliant to … Read more

Why can I pass 1 as a short, but not the int variable i?

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The first two are constant expressions, the last one isn’t. The C# specification allows an implicit conversion from int to short for constants, but not for other expressions. This is a reasonable rule, since for constants the compiler can ensure that the value fits into the target type, but it can’t for normal expressions. This … Read more