如何使用 std::format c++20 打印 const GLubyte*？

Question

I want to print the OpenGL version using the API const GLubyte *glGetString(GLenum name) using std::format().
Trying the below code gives an error:

std::cout << std::format("OpenGL Version: {}\n", glGetString(GL_VERSION));

It can be easily printed using iostream with:

std::cout << "OpenGL Version: " << glGetString(GL_VERSION);

Tell the best way to print const GLubyte* using the c++20 feature std::format() which is faster than iostream? I am using Visual Studio 2019.

Answer 1

GLubyte is commonly implemented as a typedef of unsigned char , so the return type of glGetString(GL_VERSION) is const unsigned char* .

std::format does not have a specialization of std::formatter for const unsigned char* , instead, you can use reinterpret_cast to convert it to const char* for output

std::cout << std::format(
  "OpenGL Version: {}\n", 
  reinterpret_cast<const char*>(glGetString(GL_VERSION)));