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code_learner18
·
How to properly define a static const std::string in a C++ class?
Hi everyone! I started learning C++ and encountered a problem when working with static constants in a class. I need to define a static data member of type `const std::string` inside a class.
Here is my code:
```cpp
#include
class MyClass {
public:
static const std::string kAppName = "MyApp"; // Error!
};
```
The compiler gives an error: "error: 'const std::string kAppName' cannot be initialized by a constant expression" or something like "non-const static data member must be initialized out of line". I know that for integer types (int, char, etc.) and enum you can initialize directly in the class, but for std::string this does not work.
I tried different options: removed const, added constexpr, but nothing helps. Online sources say that you need to define the static
