pub unsafe extern "C" fn nk_layout_row_begin(
ctx: *mut nk_context,
fmt: nk_layout_format,
row_height: f32,
cols: c_int,
)pub unsafe extern "C" fn nk_layout_row_begin(
ctx: *mut nk_context,
fmt: nk_layout_format,
row_height: f32,
cols: c_int,
)