I have a std::vector for constantbuffer.

Its contains data such as 4x4 matrices, floats, etc. for constant buffer, I don't want to do this in a static way (like creating XXXStruct), i wanna in a dynamic way, in fact I don't want the user to be able to send his own constant buffer datas.

How can I send this data dynamically without creating a special struct for that buffer?

or just pass std::vector.data() to constant buffer?

for dynamic data im storing vector to std::variant type

On computers today, all of main memory is equal. An array is an array is an array. The functions need a pointer to some data organized in a specific way. They don't care what you did to organize the data in the right way, all that matters is that it is formatted as expected.