Caching bin path

src/platformTools.cpp

@@ -11,29 +11,32 @@ using boost::filesystem::path;
 using std::string;
 
 path getBinPath() {
-	try {
-		// Determine path length
-		int pathLength = wai_getExecutablePath(nullptr, 0, nullptr);
-		if (pathLength == -1) {
-			throw std::runtime_error("Error determining path length.");
-		}
+	static const path binPath = [] {
+		try {
+			// Determine path length
+			int pathLength = wai_getExecutablePath(nullptr, 0, nullptr);
+			if (pathLength == -1) {
+				throw std::runtime_error("Error determining path length.");
+			}
 
-		// Get path
-		// Note: According to documentation, pathLength does *not* include the trailing zero. Actually, it does.
-		// In case there are situations where it doesn't, we allocate one character more.
-		std::vector<char> buffer(pathLength + 1);
-		if (wai_getExecutablePath(buffer.data(), buffer.size(), nullptr) == -1) {
-			throw std::runtime_error("Error reading path.");
-		}
-		buffer[pathLength] = 0;
+			// Get path
+			// Note: According to documentation, pathLength does *not* include the trailing zero. Actually, it does.
+			// In case there are situations where it doesn't, we allocate one character more.
+			std::vector<char> buffer(pathLength + 1);
+			if (wai_getExecutablePath(buffer.data(), buffer.size(), nullptr) == -1) {
+				throw std::runtime_error("Error reading path.");
+			}
+			buffer[pathLength] = 0;
 
-		// Convert to boost::filesystem::path
-		string pathString(buffer.data());
-		static path binPath(boost::filesystem::canonical(pathString).make_preferred());
-		return binPath;
-	} catch (...) {
-		std::throw_with_nested(std::runtime_error("Could not determine path of bin directory.") );
-	}
+			// Convert to boost::filesystem::path
+			string pathString(buffer.data());
+			static path binPath(boost::filesystem::canonical(pathString).make_preferred());
+			return binPath;
+		} catch (...) {
+			std::throw_with_nested(std::runtime_error("Could not determine path of bin directory."));
+		}
+	}();
+	return binPath;
 }
 
 path getBinDirectory() {