Details
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Bug
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Resolution: Done
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P3: Somewhat important
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None
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Qt Creator 4.8.0
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None
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Kubuntu 18.04; GCC 7.3; CMake 3.10; QtCreator 4.8.0.
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Linux/Other display system
Description
When using the std::get and std::variant functions, if std::visit is called in the same translation unit, the IDE generates many [errors.](https://yadi.sk/i/4xu1gIXdoIT3FQ).
#include <variant>
#include <iostream>
using namespace std;
class Foo {
public:
int a{1};
int b{2};
void set_a(const int new_a) { a = new_a; }
};
class Bat {
int Arr[200]{};
};
int main() {
int a;
cin >> a;
std::variant<Foo, Bat> var_1;
if (a == 0)
var_1 = Foo();
else
var_1 = Bat();
std::variant<Foo, Bat> var_2;
std::visit(
[](auto& arg) {
},
var_2);
std::get<Foo>(var_1).a = 444;
std::get<Foo>(var_1).set_a(124); // IDE throws an error (this argument to member function 'set_a' fas type 'const Foo', but function is not marked const)
cout << std::get<Foo>(var_1).a << endl;
return 0;
}
CMake script:
cmake_minimum_required(VERSION 3.10)
project(fast_test_2)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_STANDARD 17)
add_executable(${PROJECT_NAME} "main.cpp")
Despite this, the code is compiled (GCC 7.3).
I created a thread on the forum [here](https://forum.qt.io/topic/97947/qt-creator-cmake-and-c-17-code-model) and I was advised to write a bug report.
