[arrow] branch main updated: GH-34308: [CI][C++] Use str("") to reset std::stringstream for old g++ (#34317)

[kou]

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in repository https://gitbox.apache.org/repos/asf/arrow.git


The following commit(s) were added to refs/heads/main by this push:
     new 4064757272 GH-34308: [CI][C++] Use str("") to reset std::stringstream 
for old g++ (#34317)
4064757272 is described below

commit 4064757272d33174098f9dec86d5a3a5327bc0af
Author: Sutou Kouhei <k...@clear-code.com>
AuthorDate: Fri Feb 24 13:42:47 2023 +0900

    GH-34308: [CI][C++] Use str("") to reset std::stringstream for old g++ 
(#34317)
    
    ### Rationale for this change
    
    Error log:
    
        FAILED: 
src/arrow/CMakeFiles/arrow-array-test.dir/array/array_run_end_test.cc.o
        g++ ... -std=c++17 -c /arrow/cpp/src/arrow/array/array_run_end_test.cc
        /arrow/cpp/src/arrow/array/array_run_end_test.cc: In member
        function 'virtual void
        arrow::{anonymous}::TestRunEndEncodedArray_Printing_Test::TestBody()':
        /arrow/cpp/src/arrow/array/array_run_end_test.cc:580:9: error:
        converting to 'std::__cxx11::basic_stringstream<char>' from
        initializer list would use explicit constructor
        'std::__cxx11::basic_stringstream<
           _CharT,
           _Traits,
           _Alloc
         >::basic_stringstream(std::ios_base::openmode)
         [with _CharT = char;
               _Traits = std::char_traits<char>;
               _Alloc = std::allocator<char>;
                std::ios_base::openmode = std::_Ios_Openmode]' [-Werror]
           ss = {};
                 ^
        ...
        cc1plus: all warnings being treated as errors
    
    ### What changes are included in this PR?
    
    This pull request uses `str("")` instead of `= {}` like other tests.
    
    ### Are these changes tested?
    
    Yes.
    
    ### Are there any user-facing changes?
    
    No.
    * Closes: #34308
    
    Authored-by: Sutou Kouhei <k...@clear-code.com>
    Signed-off-by: Sutou Kouhei <k...@clear-code.com>
---
 cpp/src/arrow/array/array_run_end_test.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/cpp/src/arrow/array/array_run_end_test.cc 
b/cpp/src/arrow/array/array_run_end_test.cc
index 6b244f3932..9cf4c41056 100644
--- a/cpp/src/arrow/array/array_run_end_test.cc
+++ b/cpp/src/arrow/array/array_run_end_test.cc
@@ -577,7 +577,7 @@ TEST_P(TestRunEndEncodedArray, Printing) {
 
   ASSERT_OK_AND_ASSIGN(auto string_array,
                        RunEndEncodedArray::Make(30, run_end_values, 
string_values));
-  ss = {};
+  ss.str("");
   ASSERT_OK(PrettyPrint(*string_array, {}, &ss));
   ASSERT_EQ(ss.str(),
             "\n"
@@ -595,7 +595,7 @@ TEST_P(TestRunEndEncodedArray, Printing) {
             "  ]");
 
   auto sliced_array = string_array->Slice(15, 6);
-  ss = {};
+  ss.str("");
   ASSERT_OK(PrettyPrint(*sliced_array, {}, &ss));
   ASSERT_EQ(ss.str(),
             "\n"
@@ -616,7 +616,7 @@ TEST_P(TestRunEndEncodedArray, Printing) {
                        RunEndEncodedArray::Make(0, ArrayFromJSON(run_end_type, 
"[]"),
                                                 ArrayFromJSON(binary(), 
"[]")));
 
-  ss = {};
+  ss.str("");
   ASSERT_OK(PrettyPrint(*empty_array, {}, &ss));
   ASSERT_EQ(ss.str(),
             "\n"