The compiler is failing to figure out the exact shape of detailRoute, because it does not know the shape of Route. Option 1 One way around this is to import Route from its source, thereby providing the information that the compiler needs to determine the shape of detailRoute. import { Route } from “./../node_modules/vue-router/types/router”; export … Read more
The link provided by @MichaelHaren appears to provide the root cause. The semicolon (as others have pointed out) is inherited from C. But that doesn’t explain why C used it in the first place. The discussion includes this gem of an example: struct fred { int x; long y; }; main() { return 0; } … Read more
When you add the const keyword to a method the this pointer will essentially become a pointer to const object, and you cannot therefore change any member data. (Unless you use mutable, more on that later). The const keyword is part of the functions signature which means that you can implement two similar methods, one … Read more
This is so-called pass-by-name. It means you are passing a function that should return Int but is mostly used to implement lazy evaluation of parameters. It is somewhat similar to: def myFunc(param: () => Int) = param Here is an example. Consider an answer function returning some Int value: def answer = { println(“answer”); 40 … Read more
You can (but generally shouldn’t) use a local struct type. for ( struct { int i; char* ptr; } loopy = { 0, bam }; loopy.i < 10 && * loopy.ptr != 0; ++ loopy.i, ++ loopy.ptr ) { … } Since C++11, you can initialize the individual parts more elegantly, as long as they … Read more
Take a close look here: for (int i=3, (*p)=0 ; i>=0; i–) In the first part of the for you’re defining a new pointer variable named p which shadows the p defined earlier and initializing it to NULL. You then dereference the NULL pointer in the loop which causes the segfault. You can’t have both … Read more
If you really to assign values (as opposed to initialize), you can do it like this: GLfloat coordinates[8]; static const GLfloat coordinates_defaults[8] = {1.0f, 0.0f, 1.0f ….}; … memcpy(coordinates, coordinates_defaults, sizeof(coordinates_defaults)); return coordinates;
Each of the examples contains declarations of two different classes, both with the name A. Let’s distinguish between the classes by renaming one of them to B: struct A{ int i = 10; }; int main() { struct B{ int i = 20; }; struct B; struct B b; } The above is semantically identical … Read more
Good question, with a complicated answer. To really grasp this, you need to understand the internal structure of C++ declarations quite thoroughly. (Note that in this answer, I will totally omit the existence of attributes to prevent overcomplication). A declaration has two components: a sequence of specifiers, followed by a comma-separated list of init-declarators. Specifiers … Read more
The simplest solution is to put a named struct instance as a member in the unnamed one, and put all of the functionality into the named instance. This is probably the only way that is compatible with C++98. #include <iostream> #include <cmath> int main() { struct { struct S { double a; int b; S() … Read more