refactor(tvix/libutil): Mark single-argument constructors explicit r/1704

This is the clang-tidy lint 'google-explicit-constructor'.

There's a whole bunch of breakage that was introduced by this, and we
had to opt out a few types of this (esp. the string formatting crap).

In some cases minor other changes have been done to keep the code
working, instead of converting between types (e.g. an explicit
comparison operator implementation for nix::Pid).

Change-Id: I12e1ca51a6bc2c882dba81a2526b9729d26988e7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1832
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Reviewed-by: glittershark <grfn@gws.fyi>

1 files changed, 2 insertions, 2 deletions

diff --git a/third_party/nix/src/nix/repl.cc b/third_party/nix/src/nix/repl.cc
index 2607655f9b..b926d195ae 100644
--- a/third_party/nix/src/nix/repl.cc
+++ b/third_party/nix/src/nix/repl.cc
@@ -394,10 +394,10 @@ static int runProgram(const std::string& program, const Strings& args) {
 
   Pid pid;
   pid = fork();
-  if (pid == -1) {
+  if (pid == Pid(-1)) {
     throw SysError("forking");
   }
-  if (pid == 0) {
+  if (pid == Pid(0)) {
     restoreAffinity();
     execvp(program.c_str(), stringsToCharPtrs(args2).data());
     _exit(1);