refactor(3p/nix): Make all single-argument constructors explicit r/778

Implicit constructors can be confusing, especially in a codebase that
is already as unintentionally obfuscated as this one.

https://google.github.io/styleguide/cppguide.html#Explicit_Constructors

1 files changed, 2 insertions, 2 deletions

diff --git a/third_party/nix/src/nix/installables.cc b/third_party/nix/src/nix/installables.cc
index 8a7de8655b..2d896e3bb9 100644
--- a/third_party/nix/src/nix/installables.cc
+++ b/third_party/nix/src/nix/installables.cc
@@ -100,7 +100,7 @@ Buildable Installable::toBuildable() {
 struct InstallableStorePath : Installable {
   Path storePath;
 
-  InstallableStorePath(const Path& storePath) : storePath(storePath) {}
+  explicit InstallableStorePath(const Path& storePath) : storePath(storePath) {}
 
   std::string what() override { return storePath; }
 
@@ -112,7 +112,7 @@ struct InstallableStorePath : Installable {
 struct InstallableValue : Installable {
   SourceExprCommand& cmd;
 
-  InstallableValue(SourceExprCommand& cmd) : cmd(cmd) {}
+  explicit InstallableValue(SourceExprCommand& cmd) : cmd(cmd) {}
 
   Buildables toBuildables() override {
     auto state = cmd.getEvalState();