“not a constant expression”错误通常发生在编译时,表示编译器期望一个常量表达式(即在编译时就能确定其值的表达式),但实际上获得的是一个非常量表达式。常量表达式是那些其值在编译时就能确定,且在程序的整个生命周期内都不会改变的表达式。 2. 常见场景 数组大小定义:在C或C++中,数组的大小必须是一个常量表达式...
原因是因为你偷偷的使用了【const】关键字 删除即可
case value is not a constant expression 也就是switch case后面不支持变量,怎么解决呢?用常量当然可以,不过代码就变得不太友好了。 网上看到一条建议,很简单,不用switch case了,改用if else代替: if(unit==DT::UNIT_DEG){ if(gd>90) {gd=gd-180; } if(gd<-90) {gd=gd+180; } } if(unit==DT...
Exception(fmt::format(fmt, std::forward<Args>(args)...), code)error: ‘fmt’ is not a constant expression 40 | : Exception(fmt::format(fmt, std::forward<Args>(args)...), code) | ~~~^~~~ 简而言之就是format的str用fmt::runtime包装一下,让编译器不要把这个变量当做编译时常量。 fm...
import 'package:flutter/material.dart'; import 'package:flutter_basics_mu_01/plugin_use.dart'; // void main() { // // runApp(const MyApp()); // runApp(PluginUse) // } void main() => runApp(PluginUse()); class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(...
MSVC 2019 / VC++ 19.29 Bug: call to immediate function is not a constant expression (C++20) Closed - Not a BugView resolution11 0Votes BBBenjamin Buch - Reported Oct 20, 2023 6:44 PM [severity:I’m unable to use this version] Minimal reproducible example: consteval...
main.cpp:6:30: in 'constexpr' expansion of 'fmt::v8::basic_format_string<char, int&, int&>(f)' main.cpp:6:37: error: 'f' is not a constant expression 6 | const auto bar = fmt::format(f, args...); | ~~~^~~~ Why?Contributor vitaut commented ...
'std::_Basic_format_string<char,std::basic_string_view<char,std::char_traits>>::_Basic_format_string': call to immediate function is not a constant expression. This does not occur when using the string in other ways, such as replacing the std::format call with 'std::cout << message...
如果打开注释的那一块代码会报一个错误提醒Expression is not an integer constant expression GlogConfig.h中声明的pram(extern NSInteger const pram;)对外是一个全局不可变的一个变量. 我们在GlogConfig.m中对pram进行了初始值进行定义(const NSInteger pram = 0x11;),这里parm是一个局部常量不可变的. ...
<source>:20:34: error: non-type template argument is not a constant expressionstd::cout << ct_to_rt_string<make_ct_std_string().size()>(make_ct_std_string()).buffer;^~~~/opt/compiler-explorer/clang-16.0.0/bin/../include/c++/v1/__memory/allocator.h:113:38: note: allocation...