delayed_construct.cpp

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#include "kblib/delayed_construct.h"
#include "catch.hpp"
 
#if KBLIB_USE_CXX17
 
TEST_CASE("delayed_construct") {
   kblib::delayed_construct<int> a(0), b(0);
   REQUIRE(a == b);
   REQUIRE(not (a != b));
   REQUIRE(not (a < b));
   REQUIRE(a <= b);
   REQUIRE(not (a > b));
   REQUIRE(a >= b);
}
 
class no_hash {};
 
static_assert(
    std::is_default_constructible_v<std::hash<kblib::delayed_construct<int>>>,
    "hashing a delayed_construct<T> is possible if hashing T is possible");
static_assert(not std::is_default_constructible_v<
                  std::hash<kblib::delayed_construct<no_hash>>>,
              "hashing a delayed_construct<T> is not possible if hashing T is "
              "not possible");
 
#endif