WebFeb 24, 2024 · Discards are placeholder variables that are intentionally unused in application code. Discards are equivalent to unassigned variables; they don't have a value. A discard communicates intent to the compiler and others that read your code: You intended to ignore the result of an expression. WebJun 8, 2024 · It is fixed in v4.4. Solution 2 The actual way of indicating you don't actually use a parameter is not giving it a name: int f(int a, float) { return a* 2 ; } will compile everywhere with all warnings turned on, without warning about the unused float.

[C] Unused variable error while I have a variable

WebSwitch the warning off. IDEs can signal unused variables visually (different color, or underline). Having that, compiler warning may be rather useless. In GCC and Clang, add -Wno-unused-parameter option at the end of the command line (after all options that switch unused parameter warning on, like -Wall, -Wextra ). WebMay 23, 2011 · You can simply disable the warning with -Wno-unused-variable. However, this warning can often indicate actual errors in the code, so I wouldn't advise it. Then again, since you already have that many warnings of that type, it's probably hard to tell any new warnings apart from the old ones anyway. May 22, 2011 at 8:36am agoswami (135) matthews knowle

[Solved] Suppress unused variable warning in C++ => 9to5Answer

If you make a variable simply for the side effects of calling a function, you could drop the assignment: C lets you call a function that returns a value as if it were a "procedure" - i.e. a void function. Another alternative is declaring the variable in the global scope. WebNov 28, 2024 · In order to circumvent errors and warnings on such conditions, C++ provides attributes such as [maybe_unused] and [fallthrough] that prevent the compiler from generating warnings or errors. CPP #include #include int main () { [ [maybe_unused]] char mg_brk = 'D'; } List of standard attributes in C++ matthews knies db