compiler-errors

问题 I am attempting to set up a TypeScript project and get bootstrap 4 working along with Popper , jQuery , and Knockout in Visual Studio Code. I installed the knockout, jquery and bootstrap type definitions, npm install -–save @types/knockout npm install -–save @types/jquery npm install --save @types/bootstrap referenced the JS files in a require.js config declare var require: any; require.config({ paths: { "knockout": "externals/knockout-3.5.0", "jquery": "externals/jquery-3.3.1.min", "popper

问题 I am attempting to set up a TypeScript project and get bootstrap 4 working along with Popper , jQuery , and Knockout in Visual Studio Code. I installed the knockout, jquery and bootstrap type definitions, npm install -–save @types/knockout npm install -–save @types/jquery npm install --save @types/bootstrap referenced the JS files in a require.js config declare var require: any; require.config({ paths: { "knockout": "externals/knockout-3.5.0", "jquery": "externals/jquery-3.3.1.min", "popper

问题 cat main.c #include <stdio.h> #include <stdlib.h> #include <linux/ext2_fs.h> int main(int argc, char** argv) { return (EXIT_SUCCESS); } Here is my output... gcc main.c In file included from main.c:3: /usr/include/linux/ext2_fs.h: In function ‘ext2_mask_flags’: /usr/include/linux/ext2_fs.h:182: error: ‘FS_DIRSYNC_FL’ undeclared (first use in this function) /usr/include/linux/ext2_fs.h:182: error: (Each undeclared identifier is reported only once /usr/include/linux/ext2_fs.h:182: error: for

问题 cat main.c #include <stdio.h> #include <stdlib.h> #include <linux/ext2_fs.h> int main(int argc, char** argv) { return (EXIT_SUCCESS); } Here is my output... gcc main.c In file included from main.c:3: /usr/include/linux/ext2_fs.h: In function ‘ext2_mask_flags’: /usr/include/linux/ext2_fs.h:182: error: ‘FS_DIRSYNC_FL’ undeclared (first use in this function) /usr/include/linux/ext2_fs.h:182: error: (Each undeclared identifier is reported only once /usr/include/linux/ext2_fs.h:182: error: for

问题 I've been trying to get this function to return a Bool value but I don't understand why i'm getting the error "missing return in a function expected to return 'Bool'. I've been looking around online and tried different things but I can't seem to find a solution. Any help would be appreciated! func trueSquare(a:[Int], b:[Int]) -> Bool { for i in b[0]...b.endIndex { if b[i] == a[i]*a[i] { return true } else { return false } } } EDIT: I have changed the loop to for i in 0...(b.count - 1) but I

问题 This question already has answers here : How to mock external dependencies in tests? [duplicate] (1 answer) How to mock specific methods but not all of them in Rust? (2 answers) How can I test stdin and stdout? (1 answer) Is there a way of detecting whether code is being called from tests in Rust? (1 answer) What is the proper way to use the `cfg!` macro to choose between multiple implementations? (1 answer) Closed 8 days ago . I'm trying to run unit tests on a function reducer . reducer

问题 I get compiler error by Clang 3.8 and GCC 5.3 if I want to declare my default -ed default constructors as constexpr . According to this stackoverflow question it just should work fine: struct A { constexpr A() = default; int x; }; however: Error: defaulted definition of default constructor is not constexpr Have you got any clue what is actually going on? 回答1: As it stands, x remains uninitialized, so the object can not be constructed at compile time. You need to initialize x: struct A {

问题 I get compiler error by Clang 3.8 and GCC 5.3 if I want to declare my default -ed default constructors as constexpr . According to this stackoverflow question it just should work fine: struct A { constexpr A() = default; int x; }; however: Error: defaulted definition of default constructor is not constexpr Have you got any clue what is actually going on? 回答1: As it stands, x remains uninitialized, so the object can not be constructed at compile time. You need to initialize x: struct A {

问题 As expected, C/C++ compilation does fail with "warning: comparison between pointer and integer" for the program below: #include <stdbool.h> int main(void) { return (int*)42 == true; } But, the compilation does not fail when the true literal is changed to false . Why? Confirmed for: clang-1100.0.33.12, gcc 7.5.0 Unable to confirm for: g++ 7.5.0 回答1: In C, the macro false is defined as: #define false 0 So you're comparing a pointer against 0, which is a valid null pointer constant. 来源： https:/

问题 As expected, C/C++ compilation does fail with "warning: comparison between pointer and integer" for the program below: #include <stdbool.h> int main(void) { return (int*)42 == true; } But, the compilation does not fail when the true literal is changed to false . Why? Confirmed for: clang-1100.0.33.12, gcc 7.5.0 Unable to confirm for: g++ 7.5.0 回答1: In C, the macro false is defined as: #define false 0 So you're comparing a pointer against 0, which is a valid null pointer constant. 来源： https:/