How to pass an std::string to glShaderSource?

Question

I have the following code:

glShaderSource(shader, 1, (const char **)data.c_str(), NULL);

But it makes my program crash. How do I convert

Answer 1

You can get a reasonable-looking call by using a helper class. Define this class:

struct StringHelper {
  const char *p;
  StringHelper(const std::string& s) : p(s.c_str()) {}
  operator const char**() { return &p; }
};

Then, when you need to call glShaderSource, do it this way:

glShaderSource(shader, 1, StringHelper(data), NULL);