OpenGL ERROR E0310

[FalconDe]

default argument of type "const char *" is incompatible with parameter of type "char *"

My code:
Shader(char* vertexFile, char* fragmentFile, char* geometryFile = "")
{
GLuint vertexShader = 0;
GLuint geometryShader = 0;
GLuint fragmentShader = 0;


vertexShader = loadShader(GL_VERTEX_SHADER, vertexFile);

if(geometryFile != "")
geometryShader = loadShader(GL_GEOMETRY_SHADER, geometryFile);

fragmentShader = loadShader(GL_FRAGMENT_SHADER, fragmentFile);

this->linkProgram(vertexShader, geometryShader, fragmentShader);


//END
glDeleteShader(vertexShader);
glDeleteShader(geometryShader);
glDeleteShader(fragmentShader);

glUseProgram(0);

}
I had the same code on my other project and I had no issues. Any ideas?

[seeplus]

if(geometryFile != "")

You can't do this type of comparison with c-style strings. Try:

if (geometryFile && *geometryFile)

However, the issue is:

Shader(char* vertexFile, char* fragmentFile, char* geometryFile = "")

You are trying to default initialise geometryFile (type char* ) to "" - which is of type const char *. Try:

Shader(char* vertexFile, char* fragmentFile, const char* geometryFile = "")

However, a more usual way to default initialise a char* is to set to nullptr:

Shader(char* vertexFile, char* fragmentFile, char* geometryFile = nullptr)

If the null-terminated strings pointed to by vertexFile and fragmentFile aren't changed, then these should also be passed as const:

Shader(const char* vertexFile, const char* fragmentFile, const char* geometryFile = "")

[FalconDe]

Ah very useful information thank you Sir