move from iostream to print

src/gpu.cpp

@@ -1,7 +1,7 @@
 #include <cstdint>
 #include <fstream>
 #include <gpu.hpp>
-#include <iostream>
+#include <print>
 #include <string>
 #include <utils.hpp>
 
@@ -89,11 +89,10 @@ GpuMetricsHeader_t getGpuMetricsHeader(std::string path) {
     std::ifstream f(path, std::ios::binary);
     if (f.good()) {
         f.read(reinterpret_cast<char *>(&header), sizeof(header));
-        std::cout << "[GpuMetrics] header at path " + path + " read, GpuMetrics_v" << std::to_string(header.format_revision) << "_" << std::to_string(header.content_revision);
-        std::cout << ", size " << std::to_string(header.structure_size) << std::endl;
+        std::println("[GpuMetrics] header at path {} read, GpuMetrics_v{}_{}, size {}", path, header.format_revision, header.content_revision, header.structure_size);
         f.close();
     } else {
-        std::cerr << "[GpuMetrics] error reading header at path " + path + " (wrong card # ?)" << std::endl;
+        std::println("[GpuMetrics] error reading header at path {} (wrong card # ?)", path);  // should be err
     }
 
     return header;
@@ -109,7 +108,7 @@ auto getGpuMetrics(GpuMetricsHeader_t h, std::string path) {
             f.close();
         }
     } else {
-        std::cout << "[GpuMetrics] read failed, unsupported format" << std::endl;
+        std::println("[GpuMetrics] read failed, unsupported format");
     }
 
     return metrics;