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Protect against overloaded comma operators in decltype

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This commit is contained in:
morinmorin
2019-02-06 15:44:59 -08:00
committed by Victor Zverovich
parent 467520e7a4
commit 430e6ac9b6
3 changed files with 12 additions and 9 deletions
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include/fmt/prepare.h
+7 -5
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@@ -537,14 +537,15 @@ struct parts_container_concept_check : std::true_type {
template <typename T> static std::false_type has_add_check(check_second);
template <typename T>
static decltype(declval<T>().add(declval<typename T::format_part_type>()),
static decltype((void)declval<T>().add(
declval<typename T::format_part_type>()),
std::true_type()) has_add_check(check_first);
typedef decltype(has_add_check<PartsContainer>(check_first())) has_add;
static_assert(has_add::value, "PartsContainer doesn't provide add() method");
template <typename T> static std::false_type has_last_check(check_second);
template <typename T>
static decltype(declval<T>().last(),
static decltype((void)declval<T>().last(),
std::true_type()) has_last_check(check_first);
typedef decltype(has_last_check<PartsContainer>(check_first())) has_last;
static_assert(has_last::value,
@@ -554,7 +555,8 @@ struct parts_container_concept_check : std::true_type {
static std::false_type has_substitute_last_check(check_second);
template <typename T>
static decltype(
declval<T>().substitute_last(declval<typename T::format_part_type>()),
(void)declval<T>().substitute_last(
declval<typename T::format_part_type>()),
std::true_type()) has_substitute_last_check(check_first);
typedef decltype(has_substitute_last_check<PartsContainer>(
check_first())) has_substitute_last;
@@ -563,7 +565,7 @@ struct parts_container_concept_check : std::true_type {
template <typename T> static std::false_type has_begin_check(check_second);
template <typename T>
static decltype(declval<T>().begin(),
static decltype((void)declval<T>().begin(),
std::true_type()) has_begin_check(check_first);
typedef decltype(has_begin_check<PartsContainer>(check_first())) has_begin;
static_assert(has_begin::value,
@@ -571,7 +573,7 @@ struct parts_container_concept_check : std::true_type {
template <typename T> static std::false_type has_end_check(check_second);
template <typename T>
static decltype(declval<T>().end(),
static decltype((void)declval<T>().end(),
std::true_type()) has_end_check(check_first);
typedef decltype(has_end_check<PartsContainer>(check_first())) has_end;
static_assert(has_end::value, "PartsContainer doesn't provide end() method");