Gabe Black has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/48503 )
Change subject: base: Use if constexpr to simplify the templates in
__to_number.
......................................................................
base: Use if constexpr to simplify the templates in __to_number.
The c++-17 feature "if constexpr" allows you to put code inside a normal
if which would normally have to be separated out using templates. The
condition of the if must be compile time evaluated, and the not-taken
path is discarded by the compiler.
Change-Id: I026381b2dbb140ef7f1b5cb23803782683ec419c
---
M src/base/str.hh
1 file changed, 15 insertions(+), 28 deletions(-)
diff --git a/src/base/str.hh b/src/base/str.hh
index 94cf1f2..77eca4b 100644
--- a/src/base/str.hh
+++ b/src/base/str.hh
@@ -110,27 +110,9 @@
* @name String to number helper functions for signed and unsigned
* integeral type, as well as enums and floating-point types.
*/
-template <class T>
-typename std::enable_if_t<std::is_integral<T>::value &&
- std::is_signed<T>::value, T>
-__to_number(const std::string &value)
-{
- // Cannot parse scientific numbers
- if (value.find('e') != std::string::npos) {
- throw std::invalid_argument("Cannot convert scientific to
integral");
- }
- // start big and narrow it down if needed, determine the base
dynamically
- long long r = std::stoll(value, nullptr, 0);
- if (r < std::numeric_limits<T>::lowest()
- || r > std::numeric_limits<T>::max()) {
- throw std::out_of_range("Out of range");
- }
- return static_cast<T>(r);
-}
template <class T>
-typename std::enable_if_t<std::is_integral<T>::value &&
- !std::is_signed<T>::value, T>
+typename std::enable_if_t<std::is_integral_v<T>, T>
__to_number(const std::string &value)
{
// Cannot parse scientific numbers
@@ -138,21 +120,26 @@
throw std::invalid_argument("Cannot convert scientific to
integral");
}
// start big and narrow it down if needed, determine the base
dynamically
- unsigned long long r = std::stoull(value, nullptr, 0);
- if (r > std::numeric_limits<T>::max())
- throw std::out_of_range("Out of range");
- return static_cast<T>(r);
+ if constexpr (std::is_signed_v<T>) {
+ long long r = std::stoll(value, nullptr, 0);
+ if (r < std::numeric_limits<T>::lowest()
+ || r > std::numeric_limits<T>::max()) {
+ throw std::out_of_range("Out of range");
+ }
+ return static_cast<T>(r);
+ } else {
+ unsigned long long r = std::stoull(value, nullptr, 0);
+ if (r > std::numeric_limits<T>::max())
+ throw std::out_of_range("Out of range");
+ return static_cast<T>(r);
+ }
}
template <class T>
typename std::enable_if_t<std::is_enum<T>::value, T>
__to_number(const std::string &value)
{
- // Cannot parse scientific numbers
- if (value.find('e') != std::string::npos) {
- throw std::invalid_argument("Cannot convert scientific to
integral");
- }
- auto r = __to_number<typename std::underlying_type<T>::type>(value);
+ auto r = __to_number<typename std::underlying_type_t<T>>(value);
return static_cast<T>(r);
}
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I026381b2dbb140ef7f1b5cb23803782683ec419c
Gerrit-Change-Number: 48503
Gerrit-PatchSet: 1
Gerrit-Owner: Gabe Black <[email protected]>
Gerrit-MessageType: newchange
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