diff --git a/cfg/gtk.cfg b/cfg/gtk.cfg
index 1e20a335128..492cf592988 100644
--- a/cfg/gtk.cfg
+++ b/cfg/gtk.cfg
@@ -1506,6 +1506,7 @@
   </function>
   <!-- guint g_list_length (GList *list); -->
   <function name="g_list_length">
+    <pure/>
     <leak-ignore/>
     <noreturn>false</noreturn>
     <returnValue type="guint"/>
@@ -1679,6 +1680,7 @@
   </function>
   <!-- guint g_slist_length (GSList *list); -->
   <function name="g_slist_length">
+    <pure/>
     <leak-ignore/>
     <noreturn>false</noreturn>
     <returnValue type="guint"/>
@@ -4039,6 +4041,7 @@
   </function>
   <!-- gboolean g_str_equal (gconstpointer v1, gconstpointer v2); -->
   <function name="g_str_equal">
+    <pure/>
     <leak-ignore/>
     <noreturn>false</noreturn>
     <returnValue type="gboolean"/>
diff --git a/cfg/opengl.cfg b/cfg/opengl.cfg
index 72dcaddb961..ec37abf5516 100644
--- a/cfg/opengl.cfg
+++ b/cfg/opengl.cfg
@@ -211,6 +211,7 @@
   <!-- https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/glIsEnabled.xml -->
   <!-- GLboolean glIsEnabled( GLenum cap ); -->
   <function name="glIsEnabled">
+    <pure/>
     <noreturn>false</noreturn>
     <returnValue type="GLboolean"/>
     <use-retval/>
diff --git a/cfg/qt.cfg b/cfg/qt.cfg
index 824c4bf2881..8d599ed5d3d 100644
--- a/cfg/qt.cfg
+++ b/cfg/qt.cfg
@@ -72,6 +72,7 @@
   </function>
   <!-- const T &qBound(const T &min, const T &val, const T &max) -->
   <function name="qBound">
+    <pure/>
     <noreturn>false</noreturn>
     <use-retval/>
     <arg nr="1" direction="in">
diff --git a/cfg/sqlite3.cfg b/cfg/sqlite3.cfg
index 0b0a439b18c..6c1053b393f 100644
--- a/cfg/sqlite3.cfg
+++ b/cfg/sqlite3.cfg
@@ -966,6 +966,7 @@
   <!-- https://www.sqlite.org/capi3ref.html#sqlite3_mutex_held -->
   <!-- int sqlite3_mutex_held(sqlite3_mutex*); -->
   <function name="sqlite3_mutex_held">
+    <pure/>
     <noreturn>false</noreturn>
     <returnValue type="int"/>
     <use-retval/>
@@ -988,6 +989,7 @@
   <!-- https://www.sqlite.org/capi3ref.html#sqlite3_mutex_held -->
   <!-- int sqlite3_mutex_notheld(sqlite3_mutex*); -->
   <function name="sqlite3_mutex_notheld">
+    <pure/>
     <noreturn>false</noreturn>
     <returnValue type="int"/>
     <use-retval/>
diff --git a/cfg/std.cfg b/cfg/std.cfg
index a736d1ede38..bcea6e88b28 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -4806,6 +4806,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- char * strchr(const char *cs, int c); -->
   <function name="strchr,std::strchr">
+    <pure/>
     <use-retval/>
     <returnValue type="char *"/>
     <noreturn>false</noreturn>
@@ -5119,6 +5120,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- char* strstr(const char *s1, const char *s2); -->
   <function name="strstr,std::strstr">
+    <pure/>
     <use-retval/>
     <returnValue type="char *"/>
     <noreturn>false</noreturn>
@@ -5377,6 +5379,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   <!-- const char * strrchr(const char * str, int character);-->
   <!-- char * strrchr(char * str, int character); -->
   <function name="strrchr,std::strrchr">
+    <pure/>
     <use-retval/>
     <returnValue type="char *"/>
     <noreturn>false</noreturn>
@@ -5620,6 +5623,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- int tolower(int c); -->
   <function name="tolower,std::tolower">
+    <pure/>
     <use-retval/>
     <returnValue type="int">arg1 &lt; 'A' || arg1 &gt; 'Z' ? arg1 : arg1 + 32</returnValue>
     <noreturn>false</noreturn>
@@ -8129,6 +8133,7 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
   <!-- template< class T1, class T2 > std::pair<V1,V2> make_pair( T1&& t, T2&& u ); // since C++11 until C++14 -->
   <!-- template< class T1, class T2 > constexpr std::pair<V1,V2> make_pair( T1&& t, T2&& u ); // since C++14 -->
   <function name="std::make_pair">
+    <pure/>
     <noreturn>false</noreturn>
     <use-retval/>
     <arg nr="1"/>
@@ -8171,6 +8176,7 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
   </function>
   <!--#define offsetof(type, member) /*implementation-defined*/-->
   <function name="offsetof">
+    <pure/>
     <noreturn>false</noreturn>
     <returnValue type="std::size_t"/>
     <use-retval/>
@@ -8217,6 +8223,7 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
     </arg>
   </function>
   <function name="std::size">
+    <pure/>
     <noreturn>false</noreturn>
     <use-retval/>
     <leak-ignore/>
@@ -8667,6 +8674,7 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
     </arg>
   </function>
   <function name="std::exception::what,std::logic_error::what,std::invalid_argument::what,std::domain_error::what,std::length_error::what,std::out_of_range::what,std::future_error::what,std::runtime_error::what,std::range_error::what,std::overflow_error::what,std::underflow_error::what,std::regex_error::what,std::system_error::what,std::ios_base::failure::what,std::filesystem::filesystem_error::what,std::nonexistent_local_time::what,std::ambiguous_local_time::what,std::format_error::what,std::bad_typeid::what,std::bad_cast::what,std::bad_any_cast::what,std::bad_optional_access::what,std::bad_expected_access::what,std::bad_weak_ptr::what,std::bad_function_call::what,std::bad_alloc::what,std::bad_array_new_length::what,std::bad_exception::what,std::bad_variant_access::what">
+    <const/>
     <noreturn>false</noreturn>
     <use-retval/>
     <returnValue type="const char *"/>
@@ -8815,6 +8823,7 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
       <function name="emplace" action="push"/>
       <function name="try_emplace" action="push"/>
       <function name="insert_or_assign" action="push"/>
+      <function name="at" yields="at_index"/>
     </access>
   </container>
   <container id="stdList" startPattern="std :: list|forward_list &lt;" inherits="stdContainer">
diff --git a/lib/checkassert.cpp b/lib/checkassert.cpp
index 0202ed7454a..3ed3ae12aa7 100644
--- a/lib/checkassert.cpp
+++ b/lib/checkassert.cpp
@@ -68,6 +68,11 @@ void CheckAssert::assertWithSideEffects()
                         return ac.second.iteratorInfo.container > 0; // bailout, takes iterators -> assume read access
                     }))
                         continue;
+                    if (tmp->str() == "get" && Token::simpleMatch(tmp->astParent(), ".") && astIsSmartPointer(tmp->astParent()->astOperand1()))
+                        continue;
+                    if (f->containerYield == Library::Container::Yield::START_ITERATOR || // bailout for std::begin/end
+                        f->containerYield == Library::Container::Yield::END_ITERATOR)
+                        continue;
                     sideEffectInAssertError(tmp, mSettings->library.getFunctionName(tmp));
                 }
                 continue;
diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index 9ce1a976a68..b949f9db9bc 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -5022,3 +5022,22 @@ void assertWithSideEffect_system()
     // cppcheck-suppress [assertWithSideEffect,checkLibraryNoReturn] // TODO: #8329
     assert(std::system("abc"));
 }
+
+void assertWithSideEffect_std_map_at(const std::map<int, int>& m) // #12695
+{
+    // cppcheck-suppress checkLibraryNoReturn
+    assert(m.at(0));
+}
+
+void assertWithSideEffect_std_unique_ptr_get(std::unique_ptr<int>& p)
+{
+    // cppcheck-suppress checkLibraryNoReturn
+    assert(p.get());
+}
+
+void assertWithSideEffect_std_begin(const std::vector<std::string>& v) {
+    // cppcheck-suppress checkLibraryFunction // TODO
+    assert(std::is_sorted(std::begin(v), std::end(v), [](const std::string& a, const std::string& b) {
+        return a.size() < b.size();
+    })); // cppcheck-suppress checkLibraryNoReturn
+}