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1887d822f1
Calling copyObject in C++ without GNU extensions (e.g. when using
-std=c++11 instead of -std=gnu++11) fails with an error like this:
error: use of undeclared identifier 'typeof'; did you mean 'typeid'
This is due to the C compiler used to compile PostgreSQL supporting
typeof, but that function actually not being present in the C++
compiler. This fixes that by explicitely checking for typeof support
in C++, and then either use that or define typeof ourselves as:
std::remove_reference_t<decltype(x)>
According to the paper that led to adding typeof to the C standard,
that's the C++ equivalent of the C typeof:
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2927.htm#existing-decltype
Author: Author: Jelte Fennema-Nio <postgres@jeltef.nl>
Discussion: https://www.postgresql.org/message-id/flat/DGPW5WCFY7WY.1IHCDNIVVT300%2540jeltef.nl
71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
/*--------------------------------------------------------------------------
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*
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* test_cplusplusext.cpp
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* Test that PostgreSQL headers compile with a C++ compiler.
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*
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* This file is compiled with a C++ compiler to verify that PostgreSQL
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* headers remain compatible with C++ extensions.
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*
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* Copyright (c) 2025-2026, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/test/modules/test_cplusplusext/test_cplusplusext.cpp
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*
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* -------------------------------------------------------------------------
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*/
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extern "C" {
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#include "postgres.h"
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#include "fmgr.h"
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#include "nodes/pg_list.h"
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#include "nodes/primnodes.h"
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(test_cplusplus_add);
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}
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StaticAssertDecl(sizeof(int32) == 4, "int32 should be 4 bytes");
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/*
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* Simple function that returns the sum of two integers. This verifies that
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* C++ extension modules can be loaded and called correctly at runtime.
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*/
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extern "C" Datum
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test_cplusplus_add(PG_FUNCTION_ARGS)
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{
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int32 a = PG_GETARG_INT32(0);
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int32 b = PG_GETARG_INT32(1);
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RangeTblRef *node = makeNode(RangeTblRef);
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RangeTblRef *copy = copyObject(node);
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List *list = list_make1(node);
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foreach_ptr(RangeTblRef, rtr, list)
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{
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(void) rtr;
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}
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foreach_node(RangeTblRef, rtr, list)
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{
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(void) rtr;
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}
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StaticAssertStmt(sizeof(int32) == 4, "int32 should be 4 bytes");
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(void) StaticAssertExpr(sizeof(int64) == 8, "int64 should be 8 bytes");
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list_free(list);
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pfree(node);
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pfree(copy);
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switch (a)
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{
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case 1:
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elog(DEBUG1, "1");
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pg_fallthrough;
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case 2:
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elog(DEBUG1, "2");
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break;
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}
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PG_RETURN_INT32(a + b);
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}
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