chore: tidy up config construction

include/mrdox/Config.hpp

@@ -14,7 +14,6 @@
 
 #include <mrdox/Platform.hpp>
 #include <mrdox/Support/Error.hpp>
-#include <mrdox/Support/Thread.hpp>
 #include <functional>
 #include <memory>
 #include <string>
@@ -26,7 +25,7 @@
 namespace clang {
 namespace mrdox {
 
-class ConfigImpl;
+class ThreadPool;
 
 /** Configuration used to generate the Corpus and Docs
 

include/mrdox/Support/Thread.hpp

@@ -48,13 +48,29 @@ class MRDOX_VISIBLE
     MRDOX_DECL
     ~ThreadPool();
 
+    /** Constructor.
+
+        Default constructed thread pools may only
+        be reset or destroyed.
+    */
+    MRDOX_DECL
+    explicit
+    ThreadPool();
+
     /** Constructor.
     */
     MRDOX_DECL
     explicit
     ThreadPool(
         unsigned concurrency);
 
+    /** Reset the pool to the specified concurrency.
+    */
+    MRDOX_DECL
+    void
+    reset(
+        unsigned concurrency);
+
     /** Return the number of threads in the pool.
     */
     MRDOX_DECL

source/-adoc/AdocPagesBuilder.hpp

@@ -15,6 +15,7 @@
 #include <mrdox/Corpus.hpp>
 #include <mrdox/MetadataFwd.hpp>
 #include <mrdox/Support/Error.hpp>
+#include <mrdox/Support/Thread.hpp>
 #include <llvm/ADT/SmallString.h>
 
 namespace clang {

source/-bitcode/BitcodeGenerator.cpp

@@ -14,6 +14,7 @@
 #include "Support/SafeNames.hpp"
 #include "AST/Bitcode.hpp"
 #include <mrdox/Support/Report.hpp>
+#include <mrdox/Support/Thread.hpp>
 #include <mrdox/Metadata.hpp>
 
 namespace clang {

source/ConfigImpl.cpp

@@ -67,9 +67,8 @@ struct llvm::yaml::MappingTraits<
 namespace clang {
 namespace mrdox {
 
-Error
 ConfigImpl::
-construct(
+ConfigImpl(
     llvm::StringRef workingDir_,
     llvm::StringRef configYaml_,
     llvm::StringRef extraYaml_)
@@ -78,7 +77,7 @@ construct(
     namespace path = llvm::sys::path;
 
     if(! files::isAbsolute(workingDir_))
-        return Error("path \"{}\" is not absolute", workingDir_);
+        throw Error("path \"{}\" is not absolute", workingDir_);
     workingDir = files::makeDirsy(files::normalizePath(workingDir_));
     configYaml = configYaml_;
     extraYaml = extraYaml_;
@@ -89,14 +88,14 @@ construct(
         yin.setAllowUnknownKeys(true);
         yin >> *this;
         if(auto ec = yin.error())
-            return Error(ec);
+            throw Error(ec);
     }
     {
         llvm::yaml::Input yin(extraYaml, this, yamlDiagnostic);
         yin.setAllowUnknownKeys(true);
         yin >> *this;
         if(auto ec = yin.error())
-            return Error(ec);
+            throw Error(ec);
     }
 
     // Post-process as needed
@@ -112,13 +111,7 @@ construct(
         name = files::makePosixStyle(
             files::makeAbsolute(name, workingDir));
 
-    return Error::success();
-}
-
-ConfigImpl::
-ConfigImpl()
-    : threadPool_(0)
-{
+    threadPool_.reset(concurrency);
 }
 
 //------------------------------------------------
@@ -174,10 +167,16 @@ createConfigFromYAML(
     llvm::StringRef configYaml,
     llvm::StringRef extraYaml)
 {
-    auto config = std::make_shared<ConfigImpl>();
-    if(auto err = config->construct(workingDir, configYaml, extraYaml))
+    try
+    {
+        auto config = std::make_shared<ConfigImpl>(
+            workingDir, configYaml, extraYaml);
+        return config;
+    }
+    catch(Error err)
+    {
         return err;
-    return config;
+    }
 }
 
 Expected<std::shared_ptr<ConfigImpl const>>
@@ -202,10 +201,16 @@ loadConfigFile(
     auto workingDir = files::getParentDir(*absPath);
 
     // attempt to create the config
-    auto config = std::make_shared<ConfigImpl>();
-    if(auto err = config->construct(workingDir, *text, extraYaml))
+    try
+    {
+        auto config = std::make_shared<ConfigImpl>(
+            workingDir, *text, extraYaml);
+        return config;
+    }
+    catch(Error err)
+    {
         return err;
-    return config;
+    }
 }
 
 } // mrdox

source/ConfigImpl.hpp

@@ -58,14 +58,12 @@ class ConfigImpl
     template<class T>
     friend struct llvm::yaml::MappingTraits;
 
-    Error construct(
+public:
+    ConfigImpl(
         llvm::StringRef workingDir,
         llvm::StringRef configYaml,
         llvm::StringRef extraYaml);
 
-public:
-    ConfigImpl();
-
     ThreadPool&
     threadPool() const noexcept override
     {

source/Support/Thread.cpp

@@ -27,9 +27,20 @@ ThreadPool::
 {
 }
 
+ThreadPool::
+ThreadPool() = default;
+
 ThreadPool::
 ThreadPool(
     unsigned concurrency)
+{
+    reset(concurrency);
+}
+
+void
+ThreadPool::
+reset(
+    unsigned concurrency)
 {
     llvm::ThreadPoolStrategy S;
     S.ThreadsRequested = concurrency;