Set c++ version to c++23

I followed @pennae's advice and moved the constructor definition of
`AttrName` from the header file `nixexpr.hh` to `nixexpr.cc`.

Change-Id: I733f56c25635b366b11ba332ccec38dd7444e793

3 files changed, 11 insertions, 3 deletions

diff --git a/meson.build b/meson.build
index c7fe647ce..2cf86e985 100644
--- a/meson.build
+++ b/meson.build
@@ -50,7 +50,7 @@ project('lix', 'cpp', 'rust',
   meson_version : '>=1.4.0',
   version : run_command('bash', '-c', 'echo -n $(jq -r .version < ./version.json)$VERSION_SUFFIX', check : true).stdout().strip(),
   default_options : [
-    'cpp_std=c++2a',
+    'cpp_std=c++23',
     'rust_std=2021',
     'warning_level=2',
     'debug=true',
diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc
index 68da254e2..4b659b71a 100644
--- a/src/libexpr/nixexpr.cc
+++ b/src/libexpr/nixexpr.cc
@@ -21,6 +21,14 @@ std::ostream & operator <<(std::ostream & str, const SymbolStr & symbol)
     return printIdentifier(str, s);
 }
 
+AttrName::AttrName(Symbol s) : symbol(s)
+{
+}
+
+AttrName::AttrName(std::unique_ptr<Expr> e) : expr(std::move(e))
+{
+}
+
 void Expr::show(const SymbolTable & symbols, std::ostream & str) const
 {
     abort();
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index d16281c39..4e857b321 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -30,8 +30,8 @@ struct AttrName
 {
     Symbol symbol;
     std::unique_ptr<Expr> expr;
-    AttrName(Symbol s) : symbol(s) {};
-    AttrName(std::unique_ptr<Expr> e) : expr(std::move(e)) {};
+    AttrName(Symbol s);
+    AttrName(std::unique_ptr<Expr> e);
 };
 
 typedef std::vector<AttrName> AttrPath;